Top Circuits Page 107
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Telephone Headgear. Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic...
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Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone...
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Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...
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The Link Telephone Intercom. The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12...
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Two line intercom plus a telephone changeover switch. The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a...
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Long range FM transmitter. The power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit described here has an...
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Radio Remote Control using DTMF. Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has...
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So I wasn`t really in the mood of making and coding the timing controller for the PCB laser printer. And I remembered I had this laser tag gun that I took out of optical alignment the last time I took it apart. I figured it wouldn`t be a bad idea to take it....
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The right top node is connected to two voltage sources and has three elements. All other nodes also have three elements. Hence, we select the right top node because by this selection, we already know the node voltages of two other nodes, i. e. the ones that....
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A digital AF (audio frequency) counter can be constructed with only few components by using a single 7226B IC from Intensil as shown in the diagram. The upper frequency limit of this circuit is 9 MHz. The four important functions in the frequency counter....
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This frequency counter uses your existing digital multimeter as the display unit that is why it can be constructed at very low cost. Due to the high impedance of most DMMs, a frequency to voltage converter can be easily connected to it without matching....
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This circuit provides a 50 Hz timebase signal that is independent from the power line frequency. It is designed to provide the 50 Hz signal for electronic circuits which function only with this clock frequency (mostly circuits and electronic devices with....
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In some cases of temperature measurements, it is more advantageous to convert the measured value into a frequency than into a voltage. A temperature to frequency converter can be directly connected to a frequency counter or it can be connected to a computer....
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This is an AM demodulator which is not affected by phase errors in the demodulated signal. Phase error is a type of error commonly found in simple diode/low pass filter demodulators. At the input stage is an AC amplifier which is adjustable through P1. A1....
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Every driver knows that a high intensity light striking one`s eyes can have dangerous consequencies. Cars have a dimmer switch to lower the light intensity but unfortunately, some auto headlamps are just too bright even if they are dimmed. The dimmer circuit....
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This intercom uses an ordinary speaker to function as its microphone. Once the button is pressed, the relay toggles, and the speakers interchange their functions. One works as a normal speaker and the other one works as microphone. ..
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This is not just another dimmer circuit. The improved design of this dimmer circuit enables its triac to be triggered with lower voltage values. Normally, the triggering voltage of a triac is around 70V. In some applications though, it is desirable to use a....
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The brightness of the surrounding light controls the function of this circuit. The light sensor used in this circuit is a light dependent resistor(LDR). This LDR is connected to the non-inverting input of the 741 opamp IC. Once the intensity of the light....
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This electronic device works similar to a metal detector but it does something special: it detects live electrical wires. Such a gadget is highly useful for electricians doing repair or renovation jobs. Being able to detect hidden wires will highly reduce....
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Audio processors are usually used in paging systems, in wireless intercom and the likes to amplify the microphone signal to a certain level. This can be done by using either a compressor or a limiter circuit. Although a compressor has lower distortion....
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This 1-chip module can generate 9 different melodies. It is normally used as a doorbell, an acoustic signalling device or as a telephone "wait" melody. Once switch S1 is pressed the IC plays the melodies one after the other. It will stop after the last....
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The optical key works as an infrared door opener for house, garage and the likes. Diagram 27. 0 functions as the key. It is a transmitter module which sends out a modulated infrared (IR) beam. The modulating frequency can be adjusted through P1. Diagram 27.....
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In synchronizing the audio and the projected film, a tone code must be used. This tone code triggers a device which automatically changes the film or slide. To do this you need a two channel tape recorder. The normal audio program must be recorded in one....
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This electronic organ is very simple to construct and can provide hours of enjoyment particularly for children. The circuit is basically an emitter-coupled oscillator composed of T2 and T3. An squarewave voltage can be sampled from the collector of T3(X2).....
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If you need a triangle wave signal or a square one but you only have a sinewave generator, use this converter to avoid the trouble of beginning from scratch. It is made up of two ICs: one LM13700 and one TL084. The amplitude of the squarewave can be varied....
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The construction of this quite complicated circuit will be awarded with the joy of generating almost unlimited sound effects. The circuit can produce different sounds like the heavy chopping of a helicopter s blades up to the fine chirping of a bird. A....
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The sawtooth signal generated by this simple circuit is synchronized with the power line frequency. It is originally designed to control triac circuits but it can be used for other special applications. The supply voltage is highly flexible and can be any....
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The capability to determine which part of the tape is empty and which part has a recorded data can help accelerate your work of looking for a certain program. The circuit uses a tone decoder IC 567 and a timer IC 555. The 567 IC decodes the pilot tone of....
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The time interval of this circuit can be varied digitally through the DIP switches. The time code however must be set in BCD form. A 120 Hz signal generated by doubling the line frequency is used as the time reference. This is then divided to 1 pulse per....
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We all know how a dip meter works and what it measures - the resonance of an LC circuit. The circuit featured here is designed to work in the VHF range. The tester coil is inserted in the LX terminals and placed near the LC circuit to be tested. The variable....
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A voltage to frequency converter with a control range of 1:1000 can be easily constructed by using the IC TSC9402. The given component values in the circuit produces a conversion factor of 1kHz/1V. The input voltages from 10 mV up to 10 V are converted to....
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This voltage to frequency converter is designed to be connected to a frequency counter to display the voltage value being measured. This converter-counter combination produces a cheap but functionally complete digital voltmeter. The circuit delivers TTL....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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A simplified block diagram of the MiniLOGGER is shown in Figure 1. The CMOS analog multiplexer, 4051 provides the output for 8-channel single-end input to an analog-to-digital converter chip, CA3162. The CA3162 is connected in free running mode. The digital....
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The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated....
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In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the....
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Here is the latest and abundantly bigger TX200 VFO/VCO FM transmitter. The best able transmitter to date that can be angry into aerial allegiance stereo PLL based 200mW FM transmitter. It is a absolute ambit for transmitting your music about the abode and....
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Generating long delays of several hours can be accomplished by using a low frequency oscillator and a binary counter as shown below. A single Schmitt Trigger inverter stage (1/6 of 74HC14) is used as a squarewave oscillator to produce a low frequency of....
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This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3. 6 volt Lithium - Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3. 9....
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The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input voltage.....
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Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state....
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A simple FM transmitter links your home-entertainment arrangement to a carriageable radio that can be agitated about the abode and into the aback yard. For example, you can comedy music on the CD banker in your active room, and acquire to it on a....
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This is the latest BH1417 FM Transmitter architecture from RHOM that includes a lot of appearance in one baby package. It comes with pre-emphasis, limiter so that the music can be transmitted at the aforementioned audio level, stereo encoder for stereo....
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The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high....
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Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency....
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This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained....
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This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
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The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
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Driving the artery with your high-beam headlights can absolutely access your visibility, but can he a blinding hazard for added drivers. This simple ambit can be active into your headlight about-face to accommodate automated switching amid aerial and low....
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The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to....
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The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and....
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In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
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This mini-VOX voice operated relay is based on a circuit published in Silicon Chip, 9/1994, p31. The off delay time may be adjusted by varying R3 and R4. Reducing R3 will result in a longer release time. You could change the release time constant (C2 & R5)....
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Going camping nowadays involves demography lots of cyberbanking accessories whether for day to day active or for fun and entertainment. Most of the time a answerable advance acerbic array and a ability inverter would be acclimated to ensure a calmly....
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NE556 timer can be used as an indicator of static of digital logic audible terminal. Audible logic probe is useful for inspecting a part visually while we also need to check the logic state on other point far from the part. NE556 acts as an oscillator....
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The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB400 (Hawk II). It shows the connection between Honda parts such as the turn signal, emergency stop switch, starter button, spark plug, capacitor discharge ignition....
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The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB750F. It shows the connection between Honda parts such as the right turn signal indicator light, oil pressure warning light, neutral indicator, high beam indicator,....
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The following segment will provide the enhanced Motorola schematic for any typical application for the MRF141G (which includes parasitic stabilization features), a broadband power RF MOSFET which will place out a conservatively-rated 300 watts across the FM....
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This circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude with the 1 kHz signals when a 2nd at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or....
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The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles....
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This diy sound activated lights circuit turns a lamp ON for a brief length when the canine barks (or a somewhat strong sound) providing an impression that the occupants happen to be alerted. The condenser microphone fitted in a place to watch sound and....
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Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit`s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency....
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8051SBC USB & GLCD Expansion Board, Electronic Circuit Schematic Wiring Diagram, 8051SBC USB & GLCD Expansion Board...
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Detector Components & Infrared Motion Work, Electronic Circuit Schematic Wiring Diagram, Detector Components & Infrared Motion Work...
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50-300mW FM Transmitter With TX300 Electronic Circuit Schematic Wiring Diagram...
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This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
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Logic Gates FM Transmitter Circuit Electronic Circuit Schematic Wiring Diagram...
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The circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800....
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The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
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This circuit is also use operational amplifier IC LM324 to drive the VN64GA with the error signal and to control output voltage. This output voltage is pulsating DC, which is quite satisfactory for battery charging. This circuit also can be converted to the....
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This Circuit have output voltage 14 volt with current maximum 4A. Can be use on nicad battery and accu, wet and dry. But the accu must be 12 Volt and have current 4A or higher. The current fillter voltage build of IC CA3140 or LM324. You can which two IC.....
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Minimum Voltage required for this circuit 8 volt and maximum voltage 28 volt. Its can use to amplifier on the electronic devices such us Radio, DVD, MP4, MP5, and etc. To amplify the signal sound to audio sound, Maximum output power 2 x 20 Watts with....
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This circuit can be used to charge Accu and cells battery, the circuit can has a very stable output that would make the battery last longer and maximize the added battery capacity. When charge was also quite fast, so it can optimize the time. A diac is used....
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This cahrger based on chargeing voltage 2, 4 Volts per cell, in accordance with most manufacterers recomendation. This circuit pulses the battery under with 14. 4 Volts ( 6 cells x 2, 4 volts per cell) at a rate 120 Hz. You are reading the Circuits of....
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The circuit charger is equipped with voltage output settings, so that we can regulate how much voltage to charge the battery. And the settings using the potentio making it easier for us managing voltage up to a mV. See charger circuit below : You are reading....
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This circuit is quickly charging the battery. If you need a faster charger, this circuit is recomended to you. And this charger is low temperature, the temperatur is 5 degree celcius. Input Voltage is 15 Volt DC, and Output voltage to charging 6 -12V and you....
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This is low voltage high-current ouput, switching dc power supplly wiht input 220 Volts AC, In this circuit, an St2 diac relaxation oscilator, Q3, C1, and the diac, initiates conduction of the output switching transistor Q1, the on time of which is....
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This power supply uses two VN400A 400 Volts MOSFETs in a half-bridge power switch configuration. Each output consists of +5V at 20 A and 15 V at 1 A. Three-terminal regulators are used for the low-currents outputs, either 12 Volts or 15 Volts can be made....
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This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70....
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This is very simple charger 9V - 30V battery charger with main operation by IC LM317L and 2N222 transistor. Direct input DC voltage, the recomended capacitor is 1000uf. It can be filtering Output voltage and make long-lasting battery. And easy to make this....
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In the first, voltage from AC 220V or 110V entered to the transformer and will be lowered into 12V AC. And then AC voltage will be rectified by 4 diode or you can use bridge diode to the DC voltage. And the DC voltage output will be filtered by Condesator....
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Without any USB to phone battery charger circuit we can charging phone battery using port on USB computer, but it will quickly damage the phone battery, and the battery will bulge. Because the voltage which was issued on usb is 5 volts, while the....
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Indeed the accu charger circuit, the voltage required must be in accordance with voltage batteries, such accu 12 volts the the output voltage should not be above 12 volts and 12 volts should not be too down. If it does not comply with the required voltage,....
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Circuit schematic above is one of the voltage inverter circuit, starting from 6-Volt input on the DC current into 220-volt AC output. For maximum output power up to 30W only, and is also very small voltage current. Input voltage plus the entrance on the....
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One type of metal detector is a type of beat frequency oscillator (BFO). The methods used in metal detectors in general are changing the characteristics of the oscillator when there are close to the metal sensor. The detector works based on the resonant....
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Power Supply in this article use a regulator that is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage. Power Supply has an adjustable output with a range of 6-12 VDC.....
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The series is a series of input buffer equal to the output. In this is such a common collector circuit of air-reinforcement = 1. R value attached to restrict the current use is issued. Great value depends on the indication of its components, is usually not....
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This is an amplifier circuit using ic LM12 as the main amplifier. This amplifier has a 150Watt power output and has a 4 ohm impedance. These amplifiers have a classified high output power. The frequency response of 10Hz to 30KHz. Supply Voltage at least 9....
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The TDA9302H is a monolithic integrated circuit in HEPTAWATTTM package. This is a high efficiency power amplifier for direct drive vertical rolls from the yokes of TV. This is intended to be used in Color and B & W television as well as in monitors and....
Telephone Headgear. Acompact, inexpensive and low component count telecom head- set can be constructed using two readily available transistors and a few other electronic...
Telephone line based audio muting and light on circuit. Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone...
Telephone Ringer using 556 dual timers. Using modulated rectangular waves of different time periods, The circuit presented here produces ringing tones similar to those produced by a telephone. The...
The Link Telephone Intercom. The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12...
Two line intercom plus a telephone changeover switch. The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a...
Long range FM transmitter. The power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit described here has an...
Radio Remote Control using DTMF. Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has...
So I wasn`t really in the mood of making and coding the timing controller for the PCB laser printer. And I remembered I had this laser tag gun that I took out of optical alignment the last time I took it apart. I figured it wouldn`t be a bad idea to take it....
The right top node is connected to two voltage sources and has three elements. All other nodes also have three elements. Hence, we select the right top node because by this selection, we already know the node voltages of two other nodes, i. e. the ones that....
A digital AF (audio frequency) counter can be constructed with only few components by using a single 7226B IC from Intensil as shown in the diagram. The upper frequency limit of this circuit is 9 MHz. The four important functions in the frequency counter....
This frequency counter uses your existing digital multimeter as the display unit that is why it can be constructed at very low cost. Due to the high impedance of most DMMs, a frequency to voltage converter can be easily connected to it without matching....
This circuit provides a 50 Hz timebase signal that is independent from the power line frequency. It is designed to provide the 50 Hz signal for electronic circuits which function only with this clock frequency (mostly circuits and electronic devices with....
In some cases of temperature measurements, it is more advantageous to convert the measured value into a frequency than into a voltage. A temperature to frequency converter can be directly connected to a frequency counter or it can be connected to a computer....
This is an AM demodulator which is not affected by phase errors in the demodulated signal. Phase error is a type of error commonly found in simple diode/low pass filter demodulators. At the input stage is an AC amplifier which is adjustable through P1. A1....
Every driver knows that a high intensity light striking one`s eyes can have dangerous consequencies. Cars have a dimmer switch to lower the light intensity but unfortunately, some auto headlamps are just too bright even if they are dimmed. The dimmer circuit....
This intercom uses an ordinary speaker to function as its microphone. Once the button is pressed, the relay toggles, and the speakers interchange their functions. One works as a normal speaker and the other one works as microphone. ..
This is not just another dimmer circuit. The improved design of this dimmer circuit enables its triac to be triggered with lower voltage values. Normally, the triggering voltage of a triac is around 70V. In some applications though, it is desirable to use a....
The brightness of the surrounding light controls the function of this circuit. The light sensor used in this circuit is a light dependent resistor(LDR). This LDR is connected to the non-inverting input of the 741 opamp IC. Once the intensity of the light....
This electronic device works similar to a metal detector but it does something special: it detects live electrical wires. Such a gadget is highly useful for electricians doing repair or renovation jobs. Being able to detect hidden wires will highly reduce....
Audio processors are usually used in paging systems, in wireless intercom and the likes to amplify the microphone signal to a certain level. This can be done by using either a compressor or a limiter circuit. Although a compressor has lower distortion....
This 1-chip module can generate 9 different melodies. It is normally used as a doorbell, an acoustic signalling device or as a telephone "wait" melody. Once switch S1 is pressed the IC plays the melodies one after the other. It will stop after the last....
The optical key works as an infrared door opener for house, garage and the likes. Diagram 27. 0 functions as the key. It is a transmitter module which sends out a modulated infrared (IR) beam. The modulating frequency can be adjusted through P1. Diagram 27.....
In synchronizing the audio and the projected film, a tone code must be used. This tone code triggers a device which automatically changes the film or slide. To do this you need a two channel tape recorder. The normal audio program must be recorded in one....
This electronic organ is very simple to construct and can provide hours of enjoyment particularly for children. The circuit is basically an emitter-coupled oscillator composed of T2 and T3. An squarewave voltage can be sampled from the collector of T3(X2).....
If you need a triangle wave signal or a square one but you only have a sinewave generator, use this converter to avoid the trouble of beginning from scratch. It is made up of two ICs: one LM13700 and one TL084. The amplitude of the squarewave can be varied....
The construction of this quite complicated circuit will be awarded with the joy of generating almost unlimited sound effects. The circuit can produce different sounds like the heavy chopping of a helicopter s blades up to the fine chirping of a bird. A....
The sawtooth signal generated by this simple circuit is synchronized with the power line frequency. It is originally designed to control triac circuits but it can be used for other special applications. The supply voltage is highly flexible and can be any....
The capability to determine which part of the tape is empty and which part has a recorded data can help accelerate your work of looking for a certain program. The circuit uses a tone decoder IC 567 and a timer IC 555. The 567 IC decodes the pilot tone of....
The time interval of this circuit can be varied digitally through the DIP switches. The time code however must be set in BCD form. A 120 Hz signal generated by doubling the line frequency is used as the time reference. This is then divided to 1 pulse per....
We all know how a dip meter works and what it measures - the resonance of an LC circuit. The circuit featured here is designed to work in the VHF range. The tester coil is inserted in the LX terminals and placed near the LC circuit to be tested. The variable....
A voltage to frequency converter with a control range of 1:1000 can be easily constructed by using the IC TSC9402. The given component values in the circuit produces a conversion factor of 1kHz/1V. The input voltages from 10 mV up to 10 V are converted to....
This voltage to frequency converter is designed to be connected to a frequency counter to display the voltage value being measured. This converter-counter combination produces a cheap but functionally complete digital voltmeter. The circuit delivers TTL....
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
A simplified block diagram of the MiniLOGGER is shown in Figure 1. The CMOS analog multiplexer, 4051 provides the output for 8-channel single-end input to an analog-to-digital converter chip, CA3162. The CA3162 is connected in free running mode. The digital....
The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0. 01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated....
In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the....
Here is the latest and abundantly bigger TX200 VFO/VCO FM transmitter. The best able transmitter to date that can be angry into aerial allegiance stereo PLL based 200mW FM transmitter. It is a absolute ambit for transmitting your music about the abode and....
Generating long delays of several hours can be accomplished by using a low frequency oscillator and a binary counter as shown below. A single Schmitt Trigger inverter stage (1/6 of 74HC14) is used as a squarewave oscillator to produce a low frequency of....
This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3. 6 volt Lithium - Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3. 9....
The charger operates by supplying a short current pulse through a series resistor and then monitoring the battery voltage to determine if another pulse is required. The current can be adjusted by changing the series resistor or adjusting the input voltage.....
Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state....
A simple FM transmitter links your home-entertainment arrangement to a carriageable radio that can be agitated about the abode and into the aback yard. For example, you can comedy music on the CD banker in your active room, and acquire to it on a....
This is the latest BH1417 FM Transmitter architecture from RHOM that includes a lot of appearance in one baby package. It comes with pre-emphasis, limiter so that the music can be transmitted at the aforementioned audio level, stereo encoder for stereo....
The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high....
Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency....
This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained....
This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
The circuit comprises two sections: charger power supply and LED driver. The charger power supply section is built around 3-terminal adjustable regulator (IC1) LM317, while the LED driver section is built around transistor BD140(T2). In the charger power....
Driving the artery with your high-beam headlights can absolutely access your visibility, but can he a blinding hazard for added drivers. This simple ambit can be active into your headlight about-face to accommodate automated switching amid aerial and low....
The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to....
The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil. A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR. A Schmitt trigger oscillator (74C14) and....
In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
This mini-VOX voice operated relay is based on a circuit published in Silicon Chip, 9/1994, p31. The off delay time may be adjusted by varying R3 and R4. Reducing R3 will result in a longer release time. You could change the release time constant (C2 & R5)....
Going camping nowadays involves demography lots of cyberbanking accessories whether for day to day active or for fun and entertainment. Most of the time a answerable advance acerbic array and a ability inverter would be acclimated to ensure a calmly....
NE556 timer can be used as an indicator of static of digital logic audible terminal. Audible logic probe is useful for inspecting a part visually while we also need to check the logic state on other point far from the part. NE556 acts as an oscillator....
The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB400 (Hawk II). It shows the connection between Honda parts such as the turn signal, emergency stop switch, starter button, spark plug, capacitor discharge ignition....
The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB750F. It shows the connection between Honda parts such as the right turn signal indicator light, oil pressure warning light, neutral indicator, high beam indicator,....
The following segment will provide the enhanced Motorola schematic for any typical application for the MRF141G (which includes parasitic stabilization features), a broadband power RF MOSFET which will place out a conservatively-rated 300 watts across the FM....
This circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude with the 1 kHz signals when a 2nd at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or....
The loop may be fed inside the center of one of the vertical sides if vertical polarization is preferred. For horizontal polarization, it can be necessary to feed either in the horizontal sides in the center. Optimum directivity happens at proper angles....
This diy sound activated lights circuit turns a lamp ON for a brief length when the canine barks (or a somewhat strong sound) providing an impression that the occupants happen to be alerted. The condenser microphone fitted in a place to watch sound and....
Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit`s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency....
8051SBC USB & GLCD Expansion Board, Electronic Circuit Schematic Wiring Diagram, 8051SBC USB & GLCD Expansion Board...
Detector Components & Infrared Motion Work, Electronic Circuit Schematic Wiring Diagram, Detector Components & Infrared Motion Work...
50-300mW FM Transmitter With TX300 Electronic Circuit Schematic Wiring Diagram...
This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
Logic Gates FM Transmitter Circuit Electronic Circuit Schematic Wiring Diagram...
The circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and it provides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12, 15, 18, or 24. The 7800....
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
This circuit is also use operational amplifier IC LM324 to drive the VN64GA with the error signal and to control output voltage. This output voltage is pulsating DC, which is quite satisfactory for battery charging. This circuit also can be converted to the....
This Circuit have output voltage 14 volt with current maximum 4A. Can be use on nicad battery and accu, wet and dry. But the accu must be 12 Volt and have current 4A or higher. The current fillter voltage build of IC CA3140 or LM324. You can which two IC.....
Minimum Voltage required for this circuit 8 volt and maximum voltage 28 volt. Its can use to amplifier on the electronic devices such us Radio, DVD, MP4, MP5, and etc. To amplify the signal sound to audio sound, Maximum output power 2 x 20 Watts with....
This circuit can be used to charge Accu and cells battery, the circuit can has a very stable output that would make the battery last longer and maximize the added battery capacity. When charge was also quite fast, so it can optimize the time. A diac is used....
This cahrger based on chargeing voltage 2, 4 Volts per cell, in accordance with most manufacterers recomendation. This circuit pulses the battery under with 14. 4 Volts ( 6 cells x 2, 4 volts per cell) at a rate 120 Hz. You are reading the Circuits of....
The circuit charger is equipped with voltage output settings, so that we can regulate how much voltage to charge the battery. And the settings using the potentio making it easier for us managing voltage up to a mV. See charger circuit below : You are reading....
This circuit is quickly charging the battery. If you need a faster charger, this circuit is recomended to you. And this charger is low temperature, the temperatur is 5 degree celcius. Input Voltage is 15 Volt DC, and Output voltage to charging 6 -12V and you....
This is low voltage high-current ouput, switching dc power supplly wiht input 220 Volts AC, In this circuit, an St2 diac relaxation oscilator, Q3, C1, and the diac, initiates conduction of the output switching transistor Q1, the on time of which is....
This power supply uses two VN400A 400 Volts MOSFETs in a half-bridge power switch configuration. Each output consists of +5V at 20 A and 15 V at 1 A. Three-terminal regulators are used for the low-currents outputs, either 12 Volts or 15 Volts can be made....
This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70....
This is very simple charger 9V - 30V battery charger with main operation by IC LM317L and 2N222 transistor. Direct input DC voltage, the recomended capacitor is 1000uf. It can be filtering Output voltage and make long-lasting battery. And easy to make this....
In the first, voltage from AC 220V or 110V entered to the transformer and will be lowered into 12V AC. And then AC voltage will be rectified by 4 diode or you can use bridge diode to the DC voltage. And the DC voltage output will be filtered by Condesator....
Without any USB to phone battery charger circuit we can charging phone battery using port on USB computer, but it will quickly damage the phone battery, and the battery will bulge. Because the voltage which was issued on usb is 5 volts, while the....
Indeed the accu charger circuit, the voltage required must be in accordance with voltage batteries, such accu 12 volts the the output voltage should not be above 12 volts and 12 volts should not be too down. If it does not comply with the required voltage,....
Circuit schematic above is one of the voltage inverter circuit, starting from 6-Volt input on the DC current into 220-volt AC output. For maximum output power up to 30W only, and is also very small voltage current. Input voltage plus the entrance on the....
One type of metal detector is a type of beat frequency oscillator (BFO). The methods used in metal detectors in general are changing the characteristics of the oscillator when there are close to the metal sensor. The detector works based on the resonant....
Power Supply in this article use a regulator that is composed of 2 pieces of NPN transistor. A transistor acts as a power regulator and a transistor again serves as a controller output voltage. Power Supply has an adjustable output with a range of 6-12 VDC.....
The series is a series of input buffer equal to the output. In this is such a common collector circuit of air-reinforcement = 1. R value attached to restrict the current use is issued. Great value depends on the indication of its components, is usually not....
This is an amplifier circuit using ic LM12 as the main amplifier. This amplifier has a 150Watt power output and has a 4 ohm impedance. These amplifiers have a classified high output power. The frequency response of 10Hz to 30KHz. Supply Voltage at least 9....
The TDA9302H is a monolithic integrated circuit in HEPTAWATTTM package. This is a high efficiency power amplifier for direct drive vertical rolls from the yokes of TV. This is intended to be used in Color and B & W television as well as in monitors and....
