Popular Circuits Page 14
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Dodge Durango Fog Light Wiring Diagram...
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The battery voltage has to pass through R1 before reaching the load at the output and therefore the current passing through it is proportionately transformed into voltage across it. When the battery voltage falls beyond a certain low voltage threshold, the....
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The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface between a packet radio terminal node controller (TNC) and an amateur satellite ground station, and allows full-duplex access to the 1200 baud "Pacsat"....
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The circuit shows a simple triangle and square wave generator with a common dual operational amplifier LM1558 to produce very low frequencies around 10 kHz. The time interval for one half cycle is about R * C and outs of supply of 10 mA. The amplitude of the....
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An LCD basically consists of two glass plates with some liquid crystal material between them. The LCD has an electrically controlled light polarising liqui....
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The nicety of air coils: one can build them at home rather easily and they seem to swing at a higher inaudible frequency above 100 KHz. May be the frequency comes down once really huge coils achieve an inductance comparable to ferrite core coils. But I hope....
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The above circuit uses RS232 for interfacing with PC. It is very simple circuit & works very well with PC. Power is drawn from usb port OR needs external supply of 5V. The value of the crystal is very critical at AT89C2051 and must be 11. 0592MHz. Here....
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the moving message will be display on the LCD which will be controlled through microcontroller and the message will be sent by computer using RS232. The circuit diagram of the moving message display is shown in this post and how the whole process is....
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Most FM tuners from this era suffer from two major problems. They have a high and reactive output impedance, and the grounding scheme inside the unit is at best dubious. This is a unit from the era when single sided boards where standard issue. The near....
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Lead acid battery charger schematic using IC LM317. This lead acid battery charger circuit is simple to build and can be fit in a small box. ....
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Here is the circuit diagram of superb mini audio power amplifier, That can be power with 4. 5 volt dc to 18 volts dc (maximum). This amplifier is based on TDA1015, Product of NXP Semiconductors formerly PHILIPS Semiconductors. The TDA1015 is a monolithic....
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If you re a biker or scooter rider you ll know how easy it is to forget to cancel your flashing indicators after turning without an audible reminder. Constantly glancing at indicator lamps is hardly an option; your eyes should be on the road ahead! The....
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The circuit consists of two basic circuits, the oscillator and the detector. The oscillator uses an FET in a Colpitts configuration. The energy circulating in the oscillator tank is coupled through C4 to the detector circuit, where a small diode (D2)....
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This negative oxygen ion generator circuit is composed of power supply steady voltage circuit, under voltage detection indication circuit, high frequency oscillator and high voltage generator circuit, it is shown in the figure 9-113. The power supply steady....
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In this circuit Ql, Q2, Rl, and CI form a multivibrator. The square wave that results from the oscillation..
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Here we make use of DTMF (dual-tone multi frequency) signals (used in telephones to dial the digits) as the control codes. The DTMF tones are used for frequency modulation of the carrier. At the receiver unit, these frequency modulated signals are....
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Most battery motor speed controllers are under manual control and the operator automatically adjusts speed to match demand. Under these conditions closed loop motor speed control is an unnecessary expense. However, when it is required, a tachogenerator can....
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The circuit presented here usesNAND logic gates of Hitachi HD seriesIC HD74LS00, which is a quad NANDIC. Special technique has been employedto obtain three-state operation usingjust a single IC. Gate N1 is wired such that when theoutput of gate N1 is at....
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The circuit is shown in Figure 1, and as described above, uses a voltage doubler rectifier. Diodes D1 and D2 are 1N4004 or similar. From there, a pair of resistors provide additional smoothing to the secondary filter caps. R3 is used to balance the voltage....
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This is a lamp timer capable of operating two separate relay switches. Outputs can be in three (or restricted to two) states: OFF, delayed ON and constant ON. Delayed ON mode is indicated by the LEDs. The source code is easily customizable for your needs:....
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It uses the simpler method of direct frequency measurement which is easy to do but means that the number of digits displayed depends on the input frequency. If you want to display all digits all the time there is a technique called reciprocal counting- but....
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Consists essentially of 60-Hz sine-wave oscillator with 10K frequency-control pot, two buffer stages, and push-pull power amplifier. Circuit eliminates noise problems of square-wave inverters when operating 115-V radio receiver or cassette player in car.- G.....
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LB140 is shown in Figure Five-digit LED level indicator typical driver IC circuit, BL1405 widely used tape recorders and tape recorders do with level indication...
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This LASER is constructed on a polystirene sheet. An alluminium layer foil is placed and acts as a ground plate ( - ), this is important for preionization (i will discuss it later). After that the dielectic is placed on it leaving 1 cm from each border of....
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Circuit Principles and Applications within the lC CXA1100 series. FIG SAt Dolby switch, SAz, as recording/release switch. When the recording is placed SA2 (R) position, audio s..
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An electrical circuit that ensures that when two or more generators are connected in parallel to a power system they share the load equally. In this arrangement, if the voltage of one generator is slightly higher than that of the other generator in parallel,....
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0.1V to 50V Variable Power Supply Circuit Diagram. Features: the lowest current limit is 0.6 ampere, opamp CA3130 compares the reference voltage ....
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This circuit uses a germanium diode (marked Ge) as a temperature sensor. I used an OA90 diode but others should do. The 'ring' of Tr1 and Tr2 bias each other. Tr1's collector current is stabilized by the 5v6 zener, causing Tr2 to operate at about 5mA: this....
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Although people think that now use the timer make sense amplifier OP is not large, but after the power is turned Ai as often positive output saturation such a high noise enviro..
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The Tiny Remoteis a very compact infrared remote control with only two buttons to control an iRobot Roomba. It produces three different infrare....
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Doppler effect sensor Nl (RD627), operational amplifier N2 (LM358), the sound of dogs barking imitation special integrated circuit N3 (KD5608) and other components. When nobody..
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This circuit uses a low-input-bias op amp to give a steady dc indication of light level. To reduce circuit sensitivity to light, Rl can be reduced, but should not be less than 100 K..
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Examples OFDM modulation system. Seen from the graph, the input data signal (... --- Ol01100), the data signal by the string,..
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Automatic Street light system is very common nowadays as it provides intelligent street lighting mechanism. It provides light automatically during night. These energy saving street lights make uses of incandescent lamps instead of LEDs. So here we will teach....
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Here is the schematic for the circuit, including the connection to the piezo hit sensor. For testing, you can connect an LED between pins 3 and 4 of the 74HC14. Giving the plexiglass plate a good smack should either light or unlight the LED (depending on....
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Currently have a decent interrupt-driven RS/232 driver with support for hardware flow control running at 9600 bps. Higher baud rates are possible but I have not yet tested for stability. I also implemented some helper routines to print and get strings,....
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And 3 gn same basic circuit, and the second stage is a differential output of the power MOSFET, 2SJ77, a current mirror circuit uses 2SK214. While the operating current is only..
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3 Watt stereo amplifier circuit using MAX 7910 IC. The MAX9710 a stereo audio power amplifier IC capable of delivering 3Watts of out put to 4 Ohm loads. MAX9710 can be operated from a single 4. 5V to 5. 5V power supply, makes it ideal for hand held....
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This application note discussed the use of SEPIC power modules to provide the power needed to drive high-brighness LED arrays. The arrays are used as display backlights and require a wide dimming range. The SEPIC approach provides an efficient and flexible....
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This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro...
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This article offers an alternative to efficiency measurements as an evaluation tool of power supplies. The proposed method works well with little dependency on the output voltage and temperature. Power supplies have always been evaluated and compared based....
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Meter Ml, a +/-50-uA zero-center D`Arsonval meter movement is driven by Ul, a TL081 FET op amp, through R3. The gain of Ul is set at 11 by Rl and R2, while capacitor 01 is used to restrict the bandwidth of Ul to 1.6 Hz. Power for the circuit is derived from....
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Here is a very easy and useful schematic of an LED dimmer circuit. The circuit is using a famous voltage regulator IC LM317T. This IC can also be used as a current regulator, like it is used in the following circuit. In this circuit we have used 10 super....
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Many times we needed a stabilized, together regulated power supply and high relatively output voltage. These specifications him it cover our circuit. It `s a circuit that can give in his exit + 40V until + 60V 3A, with simultaneous stabilization. The....
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As shown, the controller includes a buck rectifier circuit 555 multivibrator, lantern control circuit for ~ 220V, 5W low power parallel control lights or 6 ~ 12V small bulb ser..
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Here is a simple PWM dc to ac voltage inverter circuit based on IC SG 3524. The SG3524 IC chips is a fixed frequency PWM (Pulse Width Modulation) voltage regulator control circuit, with indifferent outputs for single ended or push pull applications. The....
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Hello: First of all I must start with the classic ""I`m new to this forum so excuse if this post is in the wrong section / this was already....
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Normally the base of a cordless phone has an adaptor and the handset has Ni-Cd cells for its operation. The base unit becomes in-operative in case of power failure. Under such conditions, it is better to provide a backup using Ni-Cd cells externally. Here is....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
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This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. A Rotary Switch sets the timer according to six classified Photo-types (see table). A Photo resistor extends the preset time....
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From Figure 1, the host microprocessor (uP) controls the HMC6352 via I2C serial data interface lines for data (SDA) and clock (SCL). Two external 10k-ohm pull-up resistors to the nominal 3 volt DC supply create normally high logic states when the interface....
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This simple 10 watts audio power amplifier is designed for home-brewed purpose. It is based on an Audio Power Amplifier IC that is called TDA2030. It is a monolithic integrated circuit in Pentawatt package, intended for use as a low frequency class AB....
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Originally, this circuit was used to sense a low-water level in a Christmas tree stand, but the circuit can be use..
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35W resistive and capacitive half-wave phase-shift trigger doer control circuit Automatic or semi-automatic welding equipment in order to control the wire feeding, welding car ..
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Circuit, the diode VDi, f Pooh is used to stabilize VTi, VT2 base bias, so that when the supply voltage in a certain range, VTi, VT2 a more stable quiescent point. If there is ..
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The FSK demodulator is the electronics device that converts the FSK signal to serial digital signal. To transmit digital serial data we use FSK modulation and....
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While experimenting with different receivers and amplifiers powered by "free energy", it was found that it is more convenient to connect the audio amplifier to the receiver by using only two wires for audio signals and supply voltage. This would allow to use....
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A single op amp-one of four contained in the popular LM324-is operating in a variable pulsewidth, free-running squarewave oscillator circuit, with its timed output driving two transistors that control the on/ off cycle of the tape-drive motor. The....
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The electronics consist of three op-amp circuits; each built around one half of an NE5532 dual op-amp. Each circuit uses that op-amp in a different configuration. The first circuit is a non-inverting pre-amp, the second is a unity-gain phase-inverter, and....
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Here, S1 and S2 are normally open, push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load....
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The following circuit shows about Water Level Detector Circuit Diagram. This circuit based on the PIC12F683. Features:PIC Micro has the sleep ....
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This project is based on a probe logic states, capable of measuring levels from TTL (5v) to state levels of PLC's (24v). For this we have employed the use of the PIC 12F683 microcontroller, which by its nature is capable of operating at low voltages, in this....
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The following circuit shows about Elektroblock Circuit Diagram Using 12V Power Supply. Features: Other control and monitoring functions, The 18 A LAS 1218 ....
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The schematic for this project is fairly large and you can see the complete schematic below. To explain what is happening here I will split it into two sections which I will call the analog and digital sections. The schemtic below (click to enlarge it) is....
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If you ever look at construction notes for building old detector type radios the type of headphones specified always have an impedance of 2 G— 2000. Nowadays the most commonly available headphones have an impedance of 2 G— 32 , this relatively low value....
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This circuit uses a 555 timer to generate a sawtooth voltage waveform across a capacitor, then compares that signal against a steady voltage provided by a potentiometer, using an op-amp as a comparator. The comparison of these two voltage signals produces a....
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Using a low-cost high-side precision current monitor to prevent excessive load currents from damaging power supplies....
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Two 555s and a quad NAND-gate IC can simulate an electrocardiograph signal and a -y-wave radioisotope signal for applications in nuclear medicine. This circuit synchronizes the radioisotope signal to the EKG signal. You can use the circuit"s outputs to....
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Drawing, Triac V trigger voltage is less than 1V, trigger current less than 30mA...
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The purpose of a motor speed controller is to take a signal representing the demanded speed, and to drive a motor at that speed. The controller may or may not actually measure the speed of the motor. If it does, it is called a Feedback Speed Controller or....
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Many people experienced sleeping well in natural surroundings, into a tent or a wooden hut. This fact is due not only to the healthy atmosphere but also from our unconscious ability to perceive natural Earth`s magnetic-fields. The circuit generates this type....
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Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers. The circuit in Figure 1, for example, is particularly suited for....
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Here is a rough schematic of the circuit (also my first experience with Eagle!). Notes: Only the W1 output of the thermostat is used. C is the common....
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Photo diode outputs light current that is well proportional to input light power when it is used in short mode. In this lux meter, the output current is converted to voltage with an I-V converter, it is captured by a micrcontroller and displayed it in term....
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The LTC1392 is
designed to be used for PC board temperature and supply
voltage/current monitoring or as a remote temperature
and voltage sensor for monitoring almost any kind of
system. It is available in SO-8 and DIP packages allowing
it to fit onto....
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A very useful workbench lighting unit for electronics hobbyists. The portable inspection lamp circuit consists of an on-board voltage regulator and a high-bright 5mm white LED. Any 9 to 18 volt dc rated ac mains adaptor, capable to source about 100 mA of....
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Description: LM35 IC Thermal Control Circuit Diagram. Features: LM35DZ detect when the temperature is higher than the preset level, can be used in ....
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It is very important to know about the pins of the IC in order to build the circuit. 1GND - Ground, low level (0 V) 2 TRIG -. One day i went to my friends house and noticed that his doorbell gave a sound similar to a cuckkoo bird, whereas mine was a simple....
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The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. The circuit uses a Reg113-5 voltage regulator from Texas Instruments. The....
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This circuit is a 555 timer IC connected as a square-wave generator. Its base frequency is approximately 45 kHz, as determined by the values of R1, R2, and C1. The 45-kHz carrier is frequency modulated by a modified trapizoidal voltage waveform applied to....
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Crystal equivalent RLC circuit is shown. RLC circuit is a series-parallel, you can use a series resonant or parallel resonant manner style to operate. ..
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In solar cell array applications and solar instrumentation, it is desirable to monitor the approximate position of the sun to allow efficient automatic alignment. The Ll4Gllens can provide about 15° of accuracy in a simple level sensing circuit, and a....
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200mA peak current letter phone photo camera flash circuit, using a AAT3110-4.5 electrical capacitive charge pump chip, the phone lithium battery voltage boost and regulated to..
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You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of....
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Basically, this is a frequency-current converter. It is used as frequency meter. Calibrating it can be used as tachometer. Please be aware this is an experimental project, I didn't use it connected on any vehicle but it should work fine after calibration. It....
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The circuit for a SIM card reader is shown here. The circuit uses a CMOS hex inverter and other simple components; yet, not only does it work but it can also communicate with a PC via serial port! I am learning electronic circuits as a hobby and I was....
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The schematic shown here is a circuit of plant watering watcher or dry soil detector. The plants located in your home or office wants more care as compare to the plants outside. We often forget to water the plants in our home and offices due to load of work....
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The circuit described here counts the number of times that an infrared beam is interrupted. It could be used to count the number of people entering a room, for instance, or how often a ball or another object passes through an opening (handy for playing....