Top Circuits Page 176
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Switching Voltage Regulators-Step up, Step down, and polarity inverting configuration, working, and circuit diagram....
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Here is a simple circuit that can be used as a tachometer. The circuit is basically a frequency to current converter which converts the incoming signal into a proportional current to drive the meter. The deflection on the ammeter will be proportional to the....
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High Power Siren Circuit This article is all about a comparatively strong siren circuit useful for any purpose. A complementary transistor pair (BC 557 & 337) is arranged as an oscillator, directly drives the speaker. Transistor Q1(BC 557) is used to provide....
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Watch the video given below to get a better idea on how LED works A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light....
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Audio Level Meter Description A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source. This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a....
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A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....
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DC motor control circuit using NE555 Are you familiar with all the applications of 555 timer circuits If not, we can help you. We all know that for better understanding, the best source is an authenticated book on the subject. CircuitsToday presents an....
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MK484 AM receiver circuit A simple AM receiver circuit based on the MK484 AM receiver IC from Rapid Electronics Ltd is shown here. MK4844 is a monolithic integrated circuit that has all the necessary sections of a AM receiver like RF amplifier, detector, AGC....
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Here is a simple mains power failure alarm/detector circuit that produces an alarm whenever the mains supply fails. Lot of such circuits are available, but the peculiarity of this circuit is that it requires no back up power source like a battery to power....
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Multi Tone Alarm Description This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and....
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TDA2822 audio amplifier circuit , 1.35W into 4 ohm speaker @ 6V supply. Bridge and Stereo modes possible. 3V to 15V supply voltage range. Suitable for mini hand held audio applications....
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Here is a simple circuit that can be used as a telephone status indicator. When the telephone is in use (off hook) the transistor Q1 switches ON making the red LED D2 glow. When the telephone is not in use (on hook) the Q1 turns OFF and Q2 turns ON. This....
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The circuit depicted here can be used as an indicator when the telephone receiver is off-hook. The circuit can be in corporated with old telephones that does not have such an indicator. The circuit uses a complementary darling to pair using Q1 (2N3904)and Q2....
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The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of the telephone. Digit 0 is used to switch the telephone system between remote switching mode and normal conversation....
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Here is a simple circuit based on IC uA 741 that can be used to pickup voice from telephone lines without even contacting the line. If a high impedance magnetic core is placed near a telephone instrument or near one of the telephone wires, it picks up....
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This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the voltage across the lines will be about 48 volts. The preset R7 is so adjusted to obtain a 24. 7 V across between the....
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Here is a simple circuit based on two transistors that can be used to control the speed of a 12 V DC fan depending on the temperature. A thermistor (R1) is used to sense the temperature. When the temperature increases the base current of Q1 (BC 547)....
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This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is....
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The list of best & free Android Applications for the Electronics & Electrical Engineers like simulators,resistor color code,electronic tool kits....
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This circuit is a modification of High & Low voltage cut-off with delay& alarm circuit appeared in Circuits today, which I have tried and found to be quite reliable. You can adopt this circuit with small modification. Use a transformer with secondary 15 0 15....
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This is the circuit diagram of a simple three transistor audio amplifier that can deliver around 100mW power to a 25 Ohm speaker. The diodes D1 and D2 provides a constant bias voltage for the transistors Q1 and Q2. The transistor Q1 works as a preamplifier.....
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A simple touch dimmer circuit diagram using TT6061 IC, which is a touch control integrated circuit used for Light dimmer circuit and lamp dimmer circuits....
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A touch switch circuit schematic using 555 IC.When touched on the touch plate a relay will be switched ON for a preset time. This time can be adjusted too....
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A simple touch switch circuit using CD4011 is given here. The IC CD4011 is wires as a flip flop here. The 9, 13 pins of the IC works as the set and reset contacts respectively. CMOS ICs like 4011 require requires a very low current for controlling its gates.....
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A simple transformerless power supply circuit with diagram and schematics that gives 5 volts dc output.This is a low cost,low current power supply circuit suitable for simple applications like power an LED....
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A simple transistor amplifier circuit diagram and schematic which can be used as a 12 watts audio transistor amplifier.An op amp IC is used to produce the gain required....
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Here is a simple but effective intercom circuit that is based fully on transistors. The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier circuit wired around T1 & T2 becomes an astable multivibrator and....
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Transistor RC phase shift oscillator . RC phase shift oscillator using opamp. RC phase shift network. Theory and working principle. circuit diagram....
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Here is a very simple circuit that can be used to check the hfe of transistors. Both PNP and NPN transistors can be checked using this circuit. Hfe as high as 1000 can be measured by using this circuit. The circuit is based on two constant current sources....
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Next to SCR, the triac is the most widely used member of the thyristor family. In fact, in many of control applications, it has replaced SCR by virtue of its bidirectional conductivity. Motor speed regulation, temperature control, illumination control,....
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The triac is another three-terminal ac switch that is triggered into conduction when a low-energy signal is applied to its gate terminal. Unlike the SCR, the triac conducts in either direction when turned on. The triac also differs from the SCR in that....
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Triangular wave generator using opamp. Circuit diagram theory and working. Integrating square wave produces a triangular wave. Practical circuit diagram of triangular wave generator....
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The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2, C3 C4, C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter....
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Simple two transistor TV transmitter circuit that operates from 12V.Compatible with PAL B and PAL G systems....
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The working and circuit diagram of a two mode night light circuit is given below....
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A circuit that can be used to flash two Christmas stars alternatively is given here. The IC1 NE 555 is wired as an astable multivibrator here. When there is a positive pulse from the output of IC1, the transistor Q1 conducts and the relay K1 gets activated.....
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Here is the circuit diagram of a simple two transistor alarm circuit that can be operated from a 9V PP3 battery. Here the two transistors are wired to form an oscillator whose frequency increases when switch S2 is pressed and decreases when S2 is released.....
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A UJT Organ circuit with circuit diagram is explained in detail. A 2N 4891 UJT is used for the working of the circuit....
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The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors ( Q1 & Q2) and transmitted by the ultrasonic transmitter....
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Most of us take the mains ac supply for granted and use it almost casually without giving the slightest thought to its inherent shortcomings and the danger posed to sophisticated and sensitive electronic instruments/equipments. For ordinary household....
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A simple usb LED lamp circuit using 5 volts power supply from usb port, which can be used to light a desktop or laptop computer during power failure....
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Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels. The....
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A NE555 IC is used for designing the variable low frequency oscillator and schematic is also given....
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This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
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This is a very versatile voice modulator circuit using IC HT8950A from Holtek Semiconductors. The IC is capable of creating 7 upward or downward steps on the frequency of the input voice at a rate of 8Hz. There is also two special variation effects namely....
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This circuit is designed in response to a request made by Mr Vignesh. What he requested was a circuit for recording and playing voice. I think this circuit is enough for the purpose. This circuit is based on the IC ISD1020A from ISD. The ISD1020A is a CMOS....
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Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators....
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A reliable 6 to 12 volts Voltage converter circuit and diagram using audio amplifier IC TDA 2003. This Voltage doubler circuit can be assembled on a Vero board....
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The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is shorted and output of the astable multivibrator....
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Voltage Doubler circuit and Voltage Inverter circuit diagram with schematics using MAX660 IC -which is a DC voltage multiplier IC. This is a dc voltage doubler circuit and inverter....
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An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore....
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Voltage Limiter Circuit Using Op-amp-Circuit Diagram, Waveform, positive and negative voltage limiters....
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Voltage splitter using op-amp uA741 IC, circuit diagram, working, description....
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Simple 0-5 digital voltmeter using 8051 (AT89S51 microcontroller) with circuit diagram and assembly language ASM code. Simple digital voltmeter....
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This is a simple Water level alarm circuits made using 555 Timer IC. Circuit will produce an alarm when the water level reaches a preset level....
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A very simple water level controller circuit based on 555 IC and 6 transistors. A relay is used for switching the pump motor....
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This is just a fun/hobby circuit which can be used as a water sensor circuit or a liquid sensor circuit.What it does is sound an alarm in presence of water/liquid at its probes....
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This simple circuit produces a beeping sound that lasts for around 3 seconds whenever you make a whistle. The CMOS Hex inverter CD4049 is the heart of this circuit. Out of the six inverters in CD4049, U1a is wired as an audio amplifier which amplifies the....
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It is one of the most popular type of oscillators used in audio and sub-audio frequency ranges (20 20 kHz). This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. Furthermore, its output is relatively....
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Here is a very simple wind meter (anemometer) circuit. I can`t guarantee much on the accuracy of this circuit but it circuit works quite fine. You can measure wind speeds up to 75m/s using this circuit. The transistors Q1 and Q2 are used for sensing the....
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Here is the circuit diagram of a very simple wire loop alarm based on a N-channel enhancement FET 2N700, a buzzer and few passive components. In normal condition the gate of 2N700 (Q1) is connected to the ground through a 100K resistor (R2) and the wire....
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This circuit can be used to test whether mains voltage is present or not without having electric contact with mains line. The CMOS IC CD4033 is the heart of this circuit. The CD4033 consists of a 5 stage decade Johnson counter and an output decoder for....
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A demo of external interrupts in AVR (Atmega8) micro controller with circuit diagram and C code/program as ISR (interrupt service routine)....
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Here is a very simple circuit that can be used for testing Zener diodes. The IC1 NE555 is wired as an astable multivibrator and the output of the IC is stepped up to a high voltage AC using the transformer T1. The unloaded AC voltage will be around 120V. The....
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This simple circuit will produce an alarm whenever the temperature falls below zero degree. A thermistor is used here to sense temperature. The op-amp LM7215 is used to compare the reference voltage and voltage from the thermistor network. Reference voltage....
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This 1000 watt power inverter circuit diagram based on MOSFET RF50N06. If you want more power then add additional MOSFET paralleled at RF50N06. This MOSFETS are 60 Volts and 50 Amps as rated. It is necessary to connect a FUSE with the power line and always a....
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5v regulated power supply circuit, 5v power supply circuit, regulated power supply circuit diagram....
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This is a simple 12v power supply circuit diagram. It has a fixed voltage output and it based on LM7812 voltage regulator IC....
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An audio equalizer circuit is used to adjust the frequency response of an audio signal. This is a simple equalizer circuit for controlling the bass and treble (tone) of an audio amplifier. For use this equalizer circuit in amplifier, equalizer`s output....
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Many of my friends asked me for automatic on off led circuit or led flashing circuit so here I`m going to post a Astable multivibrator-2 LED flashing circuit. It is a simple astable multivibrator circuit using 2LED (here i used red LED), two NPN small....
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This is a simple audio sound level LED display circuit diagram. The circuit is completely based on a single ic LM3915 from National Semiconductor. The LM3915 is a monolithic integrated circuit. It displays the audio sound level in terms of 10 LEDs and....
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All ground point in the circuit should be connected in a single point and ground it(If possible) or connect in transformer`s 0 marked wire as shown in the circuit...
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This is a simple ultrasonic mosquito repeller circuit diagram. The circuit is design on the theory that pests like mosquito can be repelled by ultrasonic frequency around (20KHz-25KHz). This ultrasonic mosquito repeller circuit is based on a single CMOS IC....
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This is a simple circuit diagram of 5-LED audio VU meter using IC KA2284/KA2285. The KA2284, KA2285 are monolithic integrated circuit. It is a logarithmic display driver IC. And it is Bar type display driver using 5-Dot LED. The KA2284/KA2285 has a wide....
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This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....
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This simple heat sensor circuit could senses heat from various electronics device like computer, amplifier etc. and generate warning alarm. It could senses heat from environment also, but here I mention electronics device because it is being using mostly....
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This is a simple electronics circuit of clap switch project. If you are a beginner electronics learner, and love to get new project experiment then this is a great circuit for you. This circuit can on/off a 220V electronic device like fan, lamp by the sound....
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This is a simple FM transmitter circuit schematic diagram with a single transistor S9014....
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Entire AVR programmer has been build with using common parts and fits in the case of the serial connector. The socketpcb has been created to fit a 28-DIP AVR ATmega8 microcontroller, but you can build a socket pcb for any other AVRmicrocontroller out there.....
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This is a Simple com port based Microchip PIC microcontroller Programmer, This Programmer is based on JDM programmer. The entire programmer is built around commonly available components you can programe may microcontroller by using this schematic, all you....
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Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The....
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Analphanumeric low cost LCD Display is very essential for may small and big projects to Displayvarious type of information. Hitachi HD44780 Chipset based 16x2 char LCD is Really very cheap andeasily available in the local market. In this project we are going....
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GPIO, as may have been explained in other tutorials, stands for General Purpose Input/Output and a GPIO pin can be set high (taking the value 1) by connecting it to a voltage supply, or set low (taking the value 0) by connecting it to ground. The Raspberry....
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As shown by the block diagrams in Figure 1, overall signal flow in this five-input mixer was minimally changed upon modification, but I added solid-state buffers that drive independent direct outputs for the five preamp channels. For each channel, the audio....
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A total of six buffer circuits (using three dual op-amp packages), five for the input channels and one for the master output channel. (2) High input impedance (particularly for the five buffers tapping channel faders). (3) Low output impedance (<600 ohm),....
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I designed and built this stomp-box forGrammy-winning resophonic guitar player Stacy Phillips. Stacy typically uses two transducers on his Dobro-style instruments: a piezo element mounted internally and a gooseneck-mounted electret microphone positioned an....
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This Class E RF amplifier will deliver up to 400 watts of RF output, depending on the input voltage and tuning parameters (current). The amplifier uses inexpensive IXDD414 Driver ICs - one for every 2 MOSFETs. Transient Voltage Supressors (TVS devices) are....
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Looking for Stepper drivers i came across ULN2003 chip which allowed me to run the motor with minimum circuitry through the parallel port on my PC( I`m not an electronics person, hence searched for the simplest option out there). But the problem is the....
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Miniature vacuum tubes with cathodes of high-field-emitting carbon nanotubes are currently under study at Agere Systems in Murray Hill, NJ. A triode with amplification factor of 4 has been constructed, with an anode-cathode spacing of 220 µm, and a pentode....
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The following document will provide information to develop your own VACI (Vehicle Accessory Computer Interface). What I have done is rather simple, however it took about 3 weeks of planning, programming and debugging. The wow factor on this interface is....
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This project builds a Christmas lights controller for the GE Color Effects lights allowing programmed control of up to 8 sets of Christmas lights. Furthermore, it provides a function specific language for programming patterns for these lights and an....
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The Arduino 2009 acts as a standalone weather station. It does not display the data. It can operate independently for months. It samples the sensors until the RAM is full. The RAM samples are stored on a sector of an SD card. Eventually, a year`s weather....
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Switching Voltage Regulators-Step up, Step down, and polarity inverting configuration, working, and circuit diagram....
Here is a simple circuit that can be used as a tachometer. The circuit is basically a frequency to current converter which converts the incoming signal into a proportional current to drive the meter. The deflection on the ammeter will be proportional to the....
High Power Siren Circuit This article is all about a comparatively strong siren circuit useful for any purpose. A complementary transistor pair (BC 557 & 337) is arranged as an oscillator, directly drives the speaker. Transistor Q1(BC 557) is used to provide....
Watch the video given below to get a better idea on how LED works A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light....
Audio Level Meter Description A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source. This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a....
A Simple Light activated switch This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. The circuit is based on a voltage comparator circuit wired around IC 1. The non inverting in put of IC1....
DC motor control circuit using NE555 Are you familiar with all the applications of 555 timer circuits If not, we can help you. We all know that for better understanding, the best source is an authenticated book on the subject. CircuitsToday presents an....
MK484 AM receiver circuit A simple AM receiver circuit based on the MK484 AM receiver IC from Rapid Electronics Ltd is shown here. MK4844 is a monolithic integrated circuit that has all the necessary sections of a AM receiver like RF amplifier, detector, AGC....
Here is a simple mains power failure alarm/detector circuit that produces an alarm whenever the mains supply fails. Lot of such circuits are available, but the peculiarity of this circuit is that it requires no back up power source like a battery to power....
Multi Tone Alarm Description This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op amp MC1458 and LM 380. The two op amps inside the MC 1458 are used to produce square and....
TDA2822 audio amplifier circuit , 1.35W into 4 ohm speaker @ 6V supply. Bridge and Stereo modes possible. 3V to 15V supply voltage range. Suitable for mini hand held audio applications....
Here is a simple circuit that can be used as a telephone status indicator. When the telephone is in use (off hook) the transistor Q1 switches ON making the red LED D2 glow. When the telephone is not in use (on hook) the Q1 turns OFF and Q2 turns ON. This....
The circuit depicted here can be used as an indicator when the telephone receiver is off-hook. The circuit can be in corporated with old telephones that does not have such an indicator. The circuit uses a complementary darling to pair using Q1 (2N3904)and Q2....
The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of the telephone. Digit 0 is used to switch the telephone system between remote switching mode and normal conversation....
Here is a simple circuit based on IC uA 741 that can be used to pickup voice from telephone lines without even contacting the line. If a high impedance magnetic core is placed near a telephone instrument or near one of the telephone wires, it picks up....
This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the voltage across the lines will be about 48 volts. The preset R7 is so adjusted to obtain a 24. 7 V across between the....
Here is a simple circuit based on two transistors that can be used to control the speed of a 12 V DC fan depending on the temperature. A thermistor (R1) is used to sense the temperature. When the temperature increases the base current of Q1 (BC 547)....
This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is....
The list of best & free Android Applications for the Electronics & Electrical Engineers like simulators,resistor color code,electronic tool kits....
This circuit is a modification of High & Low voltage cut-off with delay& alarm circuit appeared in Circuits today, which I have tried and found to be quite reliable. You can adopt this circuit with small modification. Use a transformer with secondary 15 0 15....
This is the circuit diagram of a simple three transistor audio amplifier that can deliver around 100mW power to a 25 Ohm speaker. The diodes D1 and D2 provides a constant bias voltage for the transistors Q1 and Q2. The transistor Q1 works as a preamplifier.....
A simple touch dimmer circuit diagram using TT6061 IC, which is a touch control integrated circuit used for Light dimmer circuit and lamp dimmer circuits....
A touch switch circuit schematic using 555 IC.When touched on the touch plate a relay will be switched ON for a preset time. This time can be adjusted too....
A simple touch switch circuit using CD4011 is given here. The IC CD4011 is wires as a flip flop here. The 9, 13 pins of the IC works as the set and reset contacts respectively. CMOS ICs like 4011 require requires a very low current for controlling its gates.....
A simple transformerless power supply circuit with diagram and schematics that gives 5 volts dc output.This is a low cost,low current power supply circuit suitable for simple applications like power an LED....
A simple transistor amplifier circuit diagram and schematic which can be used as a 12 watts audio transistor amplifier.An op amp IC is used to produce the gain required....
Here is a simple but effective intercom circuit that is based fully on transistors. The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier circuit wired around T1 & T2 becomes an astable multivibrator and....
Transistor RC phase shift oscillator . RC phase shift oscillator using opamp. RC phase shift network. Theory and working principle. circuit diagram....
Here is a very simple circuit that can be used to check the hfe of transistors. Both PNP and NPN transistors can be checked using this circuit. Hfe as high as 1000 can be measured by using this circuit. The circuit is based on two constant current sources....
Next to SCR, the triac is the most widely used member of the thyristor family. In fact, in many of control applications, it has replaced SCR by virtue of its bidirectional conductivity. Motor speed regulation, temperature control, illumination control,....
The triac is another three-terminal ac switch that is triggered into conduction when a low-energy signal is applied to its gate terminal. Unlike the SCR, the triac conducts in either direction when turned on. The triac also differs from the SCR in that....
Triangular wave generator using opamp. Circuit diagram theory and working. Integrating square wave produces a triangular wave. Practical circuit diagram of triangular wave generator....
The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2, C3 C4, C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter....
Simple two transistor TV transmitter circuit that operates from 12V.Compatible with PAL B and PAL G systems....
The working and circuit diagram of a two mode night light circuit is given below....
A circuit that can be used to flash two Christmas stars alternatively is given here. The IC1 NE 555 is wired as an astable multivibrator here. When there is a positive pulse from the output of IC1, the transistor Q1 conducts and the relay K1 gets activated.....
Here is the circuit diagram of a simple two transistor alarm circuit that can be operated from a 9V PP3 battery. Here the two transistors are wired to form an oscillator whose frequency increases when switch S2 is pressed and decreases when S2 is released.....
A UJT Organ circuit with circuit diagram is explained in detail. A 2N 4891 UJT is used for the working of the circuit....
The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors ( Q1 & Q2) and transmitted by the ultrasonic transmitter....
Most of us take the mains ac supply for granted and use it almost casually without giving the slightest thought to its inherent shortcomings and the danger posed to sophisticated and sensitive electronic instruments/equipments. For ordinary household....
A simple usb LED lamp circuit using 5 volts power supply from usb port, which can be used to light a desktop or laptop computer during power failure....
Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels. The....
A NE555 IC is used for designing the variable low frequency oscillator and schematic is also given....
This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
This is a very versatile voice modulator circuit using IC HT8950A from Holtek Semiconductors. The IC is capable of creating 7 upward or downward steps on the frequency of the input voice at a rate of 8Hz. There is also two special variation effects namely....
This circuit is designed in response to a request made by Mr Vignesh. What he requested was a circuit for recording and playing voice. I think this circuit is enough for the purpose. This circuit is based on the IC ISD1020A from ISD. The ISD1020A is a CMOS....
Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Voltage controlled oscillators are commonly used in frequency (FM), pulse (PM) modulators....
A reliable 6 to 12 volts Voltage converter circuit and diagram using audio amplifier IC TDA 2003. This Voltage doubler circuit can be assembled on a Vero board....
The circuit diagram of a very simple voltage doubler using NE555 timer is shown here. Here IC NE555 is wired as an astable mutivibrator operating at around 9KHz. The base of the two transistors (Q1 and Q2) is shorted and output of the astable multivibrator....
Voltage Doubler circuit and Voltage Inverter circuit diagram with schematics using MAX660 IC -which is a DC voltage multiplier IC. This is a dc voltage doubler circuit and inverter....
An AC coupled unity gain gain voltage follower operating on a single supply is shown here. The voltage divider network of R1 and R2 provides a DC voltage equal to half the supply voltage to the non-inverting input of the 741. The output DC voltage therefore....
Voltage Limiter Circuit Using Op-amp-Circuit Diagram, Waveform, positive and negative voltage limiters....
Voltage splitter using op-amp uA741 IC, circuit diagram, working, description....
Simple 0-5 digital voltmeter using 8051 (AT89S51 microcontroller) with circuit diagram and assembly language ASM code. Simple digital voltmeter....
This is a simple Water level alarm circuits made using 555 Timer IC. Circuit will produce an alarm when the water level reaches a preset level....
A very simple water level controller circuit based on 555 IC and 6 transistors. A relay is used for switching the pump motor....
This is just a fun/hobby circuit which can be used as a water sensor circuit or a liquid sensor circuit.What it does is sound an alarm in presence of water/liquid at its probes....
This simple circuit produces a beeping sound that lasts for around 3 seconds whenever you make a whistle. The CMOS Hex inverter CD4049 is the heart of this circuit. Out of the six inverters in CD4049, U1a is wired as an audio amplifier which amplifies the....
It is one of the most popular type of oscillators used in audio and sub-audio frequency ranges (20 20 kHz). This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. Furthermore, its output is relatively....
Here is a very simple wind meter (anemometer) circuit. I can`t guarantee much on the accuracy of this circuit but it circuit works quite fine. You can measure wind speeds up to 75m/s using this circuit. The transistors Q1 and Q2 are used for sensing the....
Here is the circuit diagram of a very simple wire loop alarm based on a N-channel enhancement FET 2N700, a buzzer and few passive components. In normal condition the gate of 2N700 (Q1) is connected to the ground through a 100K resistor (R2) and the wire....
This circuit can be used to test whether mains voltage is present or not without having electric contact with mains line. The CMOS IC CD4033 is the heart of this circuit. The CD4033 consists of a 5 stage decade Johnson counter and an output decoder for....
A demo of external interrupts in AVR (Atmega8) micro controller with circuit diagram and C code/program as ISR (interrupt service routine)....
Here is a very simple circuit that can be used for testing Zener diodes. The IC1 NE555 is wired as an astable multivibrator and the output of the IC is stepped up to a high voltage AC using the transformer T1. The unloaded AC voltage will be around 120V. The....
This simple circuit will produce an alarm whenever the temperature falls below zero degree. A thermistor is used here to sense temperature. The op-amp LM7215 is used to compare the reference voltage and voltage from the thermistor network. Reference voltage....
This 1000 watt power inverter circuit diagram based on MOSFET RF50N06. If you want more power then add additional MOSFET paralleled at RF50N06. This MOSFETS are 60 Volts and 50 Amps as rated. It is necessary to connect a FUSE with the power line and always a....
5v regulated power supply circuit, 5v power supply circuit, regulated power supply circuit diagram....
This is a simple 12v power supply circuit diagram. It has a fixed voltage output and it based on LM7812 voltage regulator IC....
An audio equalizer circuit is used to adjust the frequency response of an audio signal. This is a simple equalizer circuit for controlling the bass and treble (tone) of an audio amplifier. For use this equalizer circuit in amplifier, equalizer`s output....
Many of my friends asked me for automatic on off led circuit or led flashing circuit so here I`m going to post a Astable multivibrator-2 LED flashing circuit. It is a simple astable multivibrator circuit using 2LED (here i used red LED), two NPN small....
This is a simple audio sound level LED display circuit diagram. The circuit is completely based on a single ic LM3915 from National Semiconductor. The LM3915 is a monolithic integrated circuit. It displays the audio sound level in terms of 10 LEDs and....
All ground point in the circuit should be connected in a single point and ground it(If possible) or connect in transformer`s 0 marked wire as shown in the circuit...
This is a simple ultrasonic mosquito repeller circuit diagram. The circuit is design on the theory that pests like mosquito can be repelled by ultrasonic frequency around (20KHz-25KHz). This ultrasonic mosquito repeller circuit is based on a single CMOS IC....
This is a simple circuit diagram of 5-LED audio VU meter using IC KA2284/KA2285. The KA2284, KA2285 are monolithic integrated circuit. It is a logarithmic display driver IC. And it is Bar type display driver using 5-Dot LED. The KA2284/KA2285 has a wide....
This is a basic dark detector/sensor circuit diagram based on a Photo Resistor (LDR) and few numbers of parts....
This simple heat sensor circuit could senses heat from various electronics device like computer, amplifier etc. and generate warning alarm. It could senses heat from environment also, but here I mention electronics device because it is being using mostly....
This is a simple electronics circuit of clap switch project. If you are a beginner electronics learner, and love to get new project experiment then this is a great circuit for you. This circuit can on/off a 220V electronic device like fan, lamp by the sound....
This is a simple FM transmitter circuit schematic diagram with a single transistor S9014....
Entire AVR programmer has been build with using common parts and fits in the case of the serial connector. The socketpcb has been created to fit a 28-DIP AVR ATmega8 microcontroller, but you can build a socket pcb for any other AVRmicrocontroller out there.....
This is a Simple com port based Microchip PIC microcontroller Programmer, This Programmer is based on JDM programmer. The entire programmer is built around commonly available components you can programe may microcontroller by using this schematic, all you....
Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The....
Analphanumeric low cost LCD Display is very essential for may small and big projects to Displayvarious type of information. Hitachi HD44780 Chipset based 16x2 char LCD is Really very cheap andeasily available in the local market. In this project we are going....
GPIO, as may have been explained in other tutorials, stands for General Purpose Input/Output and a GPIO pin can be set high (taking the value 1) by connecting it to a voltage supply, or set low (taking the value 0) by connecting it to ground. The Raspberry....
As shown by the block diagrams in Figure 1, overall signal flow in this five-input mixer was minimally changed upon modification, but I added solid-state buffers that drive independent direct outputs for the five preamp channels. For each channel, the audio....
A total of six buffer circuits (using three dual op-amp packages), five for the input channels and one for the master output channel. (2) High input impedance (particularly for the five buffers tapping channel faders). (3) Low output impedance (<600 ohm),....
I designed and built this stomp-box forGrammy-winning resophonic guitar player Stacy Phillips. Stacy typically uses two transducers on his Dobro-style instruments: a piezo element mounted internally and a gooseneck-mounted electret microphone positioned an....
This Class E RF amplifier will deliver up to 400 watts of RF output, depending on the input voltage and tuning parameters (current). The amplifier uses inexpensive IXDD414 Driver ICs - one for every 2 MOSFETs. Transient Voltage Supressors (TVS devices) are....
Looking for Stepper drivers i came across ULN2003 chip which allowed me to run the motor with minimum circuitry through the parallel port on my PC( I`m not an electronics person, hence searched for the simplest option out there). But the problem is the....
Miniature vacuum tubes with cathodes of high-field-emitting carbon nanotubes are currently under study at Agere Systems in Murray Hill, NJ. A triode with amplification factor of 4 has been constructed, with an anode-cathode spacing of 220 µm, and a pentode....
The following document will provide information to develop your own VACI (Vehicle Accessory Computer Interface). What I have done is rather simple, however it took about 3 weeks of planning, programming and debugging. The wow factor on this interface is....
This project builds a Christmas lights controller for the GE Color Effects lights allowing programmed control of up to 8 sets of Christmas lights. Furthermore, it provides a function specific language for programming patterns for these lights and an....
The Arduino 2009 acts as a standalone weather station. It does not display the data. It can operate independently for months. It samples the sensors until the RAM is full. The RAM samples are stored on a sector of an SD card. Eventually, a year`s weather....
