Popular Circuits Page 64
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Circuit shown in Figure 13-3. Figure 13-3 (a) DC power supply, Figure 13-3 (b) with AC power. They are used to control the relay. Flash frequency is determined by the resistanc..
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As more and more of the world becomes concerned with conserving electric power and the fuels that generate electricity, there is a growing market for products to help the conscientious homeowner keep an eye on and minimize their power usage. Organizations....
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This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subj....
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FAN7710 Ballast Control circuit design for Compact Fluorescent Lamps electronic project...
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What kind of microphone or mouthpiece I can use to connect across a pots telephone line in order to send dtmf tones ( no voice ) dtmf only. Can I use a regular mic or does it have to be a certain type, I am using a 300 ohm resistor to hold open the line....
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Vibration Sensor or Piezoelectric Vibration Sensor Circuit Diagram. It generates a loud beep when somebody tries to break the door or window. The alarm stops automatically after three minutes. The circuit uses a piezo element as the vibration sensor ..
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DTL integrated circuit constituted by a crystal oscillator a DTL is shown by the crystal oscillator integrated circuits, and the oscillation frequency is 100 kHz and 1 MHz. It ..
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A very simple and useful project of soil moisture circuit. The circuit is using only four components and a 3 volt battery. The circuit will detect if there is water in the soil of any plant and light up the LED. The resistor R2 is a potentiometer to adjust....
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Condenser Microphones typically sound better than dynamic microphones. If you are unfamiliar with these two types of microphones you may want to read about them in this Wikipedia article. Electret condenser microphones have to little plates (capacitor), one....
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This recorder can be connected to the telephone lines just about any place, and no external power source is needed. The tape recorder"s switch terminals are applied to a pair of transistors, connected as Darlingtons, that are used to turn the recorder on....
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A simple mini or small audio amplifier circuit with diagram and schematic using TDA 7052 IC from philips. Ideal to use as a pocket radio amplifier circuit which deliver 2 watts....
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This circuit responds quickly enough to prevent damage from most overloads. C 1 "s input is connected to the output of the LT1088 servo circuit. If the LT1088 circuit"s output exceeds the threshold at Cl"s other input, C1 trips, discharging the 2-!"F....
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As shown in FIG generator start battery automatic monitor circuit diagram ..
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The circuit offers independent control of initial delay and pulse rate. ICIc is connected as a pulse generator whose operation is inhibited by the normally low O/P of the ICla. When the circuit input goes low i.e., by pressing PB1, IClb O/P goes high and the....
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I have an Onkyo TX2500 mk II receiver that I`m hoping to fix up for a friend, which is not working properly on AM or FM. Tuning to AM gives low....
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In this circuit, a full-wave bridge is switched to a full-wave center tap to reduce regulator dissi..
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This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles, ...
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P1_47K Log. Potentiometer (See Notes) P2, P3_47K Linear Potentiometers R1, R3, R5_4K7 1/4W Resistors R2_22K 1/4W Resistor R4_1M 1/4W Resistor R6_1K8 1/4W Resistor R7_560R 1/4W Resistor C1, C4, C5, C7_10 µF 63V Electrolytic Capacitors (See Notes) C2_47nF 63V....
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AFX slot car sets are very enjoyable but you can increase the fun with a lap counter. This circuit will count from 00 to 99, with independent counters for each track. The sensing device used is a Hall effect sensor (UGN3503; available from Dick Smith....
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This circuit shows a Lithium Battery Charger circuit diagram. Charging is accomplished with a constant current of 60 mA for AA cells to a cutoff of 2. 4V per cell, at which point the charge must be terminated. Component: LM317 IC, Diode, Resistor, Capacitor,....
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Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence of an ac voltage; either LED alone indicates the presence and polarity of a dc voltage. The diode-bridge....
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The High Speed Function Generator was published in the professional electronics section of the Aug 1996 issue of Electronics Australia, and has proven to be extremely popular. The kit is no longer available from any of the kit suppliers...
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The pitch of the tone is dependent upon the resistance under test. The tester will respond to resistance of hundreds of kilohms, yet it is possible to distinguish differences of just a few tens of ohms in low-resistance circuits. Ql and Q2 form a....
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Although this design is reproduced directly from the manufacturer s datasheets, its use in this application is rather novel. Originally intended for high-....
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The HP Model 400A Vacuum Tube Voltmeter is unusually flexible because of its wide frequency and voltage ranges. AC Voltages as small as. 005 and as high as 300 volts can be simply and directly measured without any precautions over a frequency range of 10....
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I took 22 used, octal, 6. 3-volt, 600mA, controlled-warm-up tubes (mostly 6SN7s) and 22 octal tube sockets and an old extension cord and wired all the sockets in series. Then I plugged the series into a wall socket and reveled in the soft glow of 22 tubes....
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Circuit operation principle of the device shown in Figure. Usually infrared light emitting tube VD1 infrared radiation emitted in infrared receiver tube VD2, leading to VD2 internal resistance becomes smaller, so the LSE feet high output at this time, when the..
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A 555 and a dual 556 timer generate a rudimentary video signal, as shown in the schematic. The first timer generates 4.7-8 synch pulses operating in the astable mode with a 64-8 period. The second timer generates a delay pulse, which triggers the third....
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The fan runs constantly in many PCs, which may not even be necessary. A simple controller circuit can regulate the fan speed according to demand. This not....
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Learn how to fortify your fortress no matter what the size with this ingenious myriad of a customizable laser grid. Once someone steps through and bre....
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Miniature DC Motor Speed Control circuit b Having a steady speed function micro motor drive circuit steady speed Miniature DC motor control circuit shown in Figure 8-32. Ring (a) shows the voltage feedback mode is for tape recording machine miniature DC motor ..
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Actually this is the another version of my older DVM project that was based on PIC12F683. The older version displays the measured voltage on a LCD that is driven serially by PIC12F683 using 3 I/O pins. The new one uses PIC16F688 microcontroller that doesn`t....
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The Circuit diagram is ideal for accurate control of DC motors. DC voltage conversion to a series of pulses, such that the duration of the pulse ....
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A rear wiper/washer similar what every SUV on the road has. this kit has the motor mounting through the glass, which the end users cannot do since the glass is tempered. The truck cap manufacturers can have the glass drilled appropriately, before tempering.....
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A battery-powered, pushbutton-triggered TTL/CMOS-compatible source of debounced 5V logic pulses is a simple but handy piece of test equipment to have in any tool kit (Figure 1). The circuit`s battery-powered operation complicates what would otherwise be a....
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For SR AB763 driver replace: 25k pot, 0.1uF cap and 4k7 resistor with 100 ohm resistor to ground. 56k resistor with 820 to 4k7 resistor. ..
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. The 1K resistors in the circuit are capital so that the LED`s about-face on at altered audio levels. There is no acumen why....
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Reliable 10A adjustable voltage regulator based on MSK5012. 1.3 to 30V output voltage range. Low ripple and high efficiency....
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This Simple circuit can monitor overflow of water from the Overhead tank. The sensor placed close to the lid of the overhead tank always monitor the presen....
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When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1`s pin 3 outputs low level and VT is disconnected. The alarm circuit does not work. When there is an earthquake, the magnet will move vertically. When it is....
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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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This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps can be varied by Pulse Width Modulating the input of the MC3392. The....
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When no light, photocell PC1, PC2 was high resistance, Q1, Q2 is turned off the relay contacts K1, K2 relay..
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This circuit is used to convert a mono audio signal into a stereo signal that can be panned between the left and right channel by a 0-10V control signal, it is intended for analog synthesizer systems. The circuit is mainly here for historical reasons, a....
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Display lights problem on Nokia N73 can be caused by several reasons, for example broken path on the display circuit, damaged the display driver, and others. Here, mobile repair guide provide some pictures relating to Nokia N73 display problem, especially on....
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As shown in FIG economic fluorescent display circuit. The core of the circuit is the multivibrator 555 and R1, R2, C1 and other components of the oscillation frequency is f 1.4..
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This stereo FM stereo modulator circuit use the BH1417F FM stereo transmitter IC which consists of a stereo modulator for generating stereo composite signals and a FM transmitter for broadcasting a FM signal on the air. The stereo modulator generates a....
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This is a design circuit project for a clear glass sensor circuit can be used for experiment/hobby purposes. The concept is very simple and is based on a home-made sensor unit comprising one high efficiency ultra bright red LED (D1) and a standard ph ....
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A circuit for car windshield/wiper motor speed control built using NE 555 IC.This enables intermittent windshield wiper control which changes sweep rate to 10 seconds....
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Conventional monolithic micropower op amps with a
wide supply voltage range require a large die area and
therefore, a large package and footprint. The unconventional
LT®6011 dual op amp fits 25mV input precision
micropower operation and wide 2.7V to 36V....
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The MOC303XM and MOC304XM devices consist of a AlGaAs infrared emitting diode optically coupled to a monolithic silicon detector performing the function of a zero voltage crossing bilateral triac driver. MOC3041. They are designed for use with a triac in the....
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Here is one example of the electronic metronome schematic. electronic metronome is very popular since it can be very simple, compact/small, ....
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The inputs of the gate must be connected, either to LOW or to HIGH, and must not be left open circuit. This is the function of the input switches with their pull-down resistors. To avoid loading the output of the gate, a transistor switch indicator circuit....
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As with the Electronic sel. 8 we also have here a circuit with a choice of 8 different sources. The difference is that only two of the switches are used and the movement of commands is Up-Down in series. We have evidence of activity at each entrance by the....
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Switch mode/switching voltage regulator with TL497 integrated circuit, up to 75% efficiency, output: 5V, input: 7.5-15V...
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This circuit could be regarded as a simple alternative to the Sooper Snooper device featured elsewhere in this issue. It is based on the PreChamp preamplifier featured in the July 1994 issue of SILICON CHIP. It can be used to pinpoint or locate sounds coming....
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Measures 10mV to 50Volt RMS in eight ranges.
Simply connect to your Avo-meter set to 50µA range. Connect J2 and J3 to an Avo-meter set to 50µA range. Switching SW2 the four input ranges will be multiplied by 5. Total fsd ranges are: 10mV, 50mV, 100mV,....
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At the heart of this over heat detector circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. The LM35 develops an....
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MC2833 MC2831 radio transmitter dedicated circuit is improved.Radio transmitter typical application circuit this circuit generates a high frequency 49.7MHz signal transmitted by the antenna out...
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a year ago I designed a class-D amplifier based on the TAS5162, pcm1808 and TAS5086. During the year, was made a few hundred samples intended to be sold to radio amateurs. Most devices are functioning properly and not cause any complaints from consumers. But....
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This is Wide band high frequency amplifier circuit,Wide frequency band between 75-150 MHz,Using transistors, a PNP amplifier.To enhance the signal strength.Before the receiver of the phone. Or FM radio or amateur radio. If high-frequency signals, in....
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The output of this circuit is a current proportional to temperature, which can be used to drive a meter for a direct readout. Alternatively, a resistor or op amp can be used to get a voltage output. The circuit is pulsed at a low duty cycle to reduce power....
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Circuit detail is shown in figure 3. The main elements of the system are a speech amplifier, the audio phase shift network with balanced driver circuit (N1A, N2A), two balanced modulator stages (N1B & N2B), an RF carrier phase shift circuit (N3) and an....
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WPG DM8168 DaVinciTM high-definition video SoC Trident Multiple DVR / NVR surveillance solutions MT9M033 image sensor Lord of the safety monitoring system, the best solution for passive components Conexant Conexant`s line of multi-channel video surveillance....
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The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single input-frequency to generate all twelve notes of the musical scale. The input signal is provided by IC1, a 4001 quad 2-input NOR gate. Two sections of that IC are used to....
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This is a Portable light-level meter circuit with five-decade dynamic range. This uses a single cell battery as the power supply. To calibrate this circuit,....
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Two combinations of cell count and output voltage are to
be strictly avoided: three cells converted to 3.3V and four
cells converted to 5V. These combinations are troublesome
because no ordinary regulator (boost, buck or linear)
can accommodate a....
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A simple telephone transmitter circuit that is ideal for transmitting the telephone conversation through small distances. The circuit is very simple and uses only few components. The entire circuit can be easily included in the telephone itself or in the....
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This circuit is the electronic emulation of the I Ching, a form of divination originating in China. In the classical form, the response is obtained by the manipulation of 50 sticks or, more practically, by tossing 3 coins. The process must be repeated 6....
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Generating complementary clock signals in a Spice simulation is an easy task. However, this task gets much harder if you need to introduce some dead time into the signals. This difficulty is especially true when you`re dealing with a....
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Development board with high power relays, opto-coupled inputs, power supply circuit, crystal oscillator circuit, RS232 port, with ICSP and JTAG ports! JTAG 5x2 pin connector for in-circuit ....
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The P5 design uses only eight 74HC/AC240 chips which are all octal inverting buffers. Each 74HC/AC240 chip has two groups of four inverters each controlled by a tri-state enable pin (pin 1 and 19). The 74AC240 chips (U1-U5) are used as H-bridge style motor....
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This circuit was designed on request, to remotely monitor when a couple of electric heaters have been left on. Its sensor must be placed in contact with the feeder to be able to monitor when the power cable is drawing current, thus causing the circuit to....
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This application uses the timer connected for astable (free-running) operation, with a modulating signal again applied to the control voltage terminal. ..
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Take care with transmitter circuits. It is illegal in most countries to operate radio transmitters without a license. Although only low power this circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres...
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This circuit provides a regulated dc with less than 100 mV of ripple for microprocessor applications. Necessary operating voltages are taken from the bleeder resistor network connected across the unregulated 28 V supply. The output of the LM710 comparator....
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The power supply is pretty mundane. The 110VAC comes in on connector N17 and is hooked in series with a power switch SW1, a fuse F1, and the primary coil of transformer T1. The secondary coil of T1 produces 24VAC at 12 Amps and is routed through the full....
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The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
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The test beeper generates a sinusoidal signal with a frequency of 1, 000 Hz, a common test frequency for audio amplifiers. It consists of a classical Wien-Bridge oscillator (also known as a Wien-Robinson oscillator). The network that determines the frequency....
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About twenty five years ago, an inventor friend of mine showed me some illustrations in a college physics book. The book was one of a three volume collection of physics lectures given by the noble prize winner Richard Feynman. The book illustration was very....
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In the wiper-delay schematic shown, with the ignition on, Dl maintains regulated +12 Vdc. When SI closes..
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As shown in FIG, MP1826 in the circuit as a multi-stage divider. LM567 is the frequency demodulation circuit, the circuit as a dual-band oscillator which generates the desired ..
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The following circuit shows about Ultrasonic Sensor Switch circuit diagram. This circuit based on the 555 Timer IC for Ultrasonic Transmitter, and ....
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At first glance this circuit looks fairly complex, but when broken down, can be divided into high pass and low pass filter sections followed by a summing amplifier with a gain of around 20 times. Supply rail voltage is +/- 9V DC. The controls may also be....
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This circuit will supply up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn`t generate very much heat.The circuit draws about 30ma AC. Always use a fuse and/or a fusible resistor to be on the safe side. The values....
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Circuit shown in Figure 3-84. Be seen by the two electric motors can be started separately. But only when you press Host (Ml) of the stop button SBz (after contact KMi release)..
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This circuit is very simple less than 12 component, to build DC to AC converter. The principle of this circuit is generating 50/60Hz frequency by IC CD4047 and the output complement pin 10 and 11 of IC CD4047 to drive MOSFET IRFZ 44 so induction primary....
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The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. (There is another good reason to....