Top Circuits Page 203
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A very simple metal detector electronic project circuit can be designed using the CS209A integrated circuit manufactured by Cherry Semiconductor. The CS209A integrated circuit is a bipolar monolithic integrated circuit for use in metal detection proximity....
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The op-amp IC1D shapes the frequency response to amplify those frequencies produced when motion is detected and rejects all others, such as those due to noise or slow temperature changes. When IC1D outputs a voltage higher than 1. 67V, it forces pin 8 and....
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A very simple proximity detector can be made using this electronic scheme. This electronic circuit reacts to the presence of a conductive object within a particular field. Circuit sensitivity can be adjusted with potentiometer P1 for the desired distance.....
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A very simple proximity detector electronic project can be designed using this schematic circuit. This proximity detector electronic project use a tone decoder integrated circuit ( NE567 ) that will provides a signal with a frequency about 100Khz. When an....
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This rain detector electronic circuit project is an very simple alarm circuit, that will start an audio warning, if the liquid is present on the sense pad. This rain detector electronic circuit diagram is based on two transistors. When the sense pads....
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This sensor switch circuit has nine channels and consist of only three integrated circuits and some resistors. Due to high input impedance, 74HC147 allows to use of 4. 7 M resistors to create a logic level "high" to sensor inputs. When one sensor is touched,....
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This lie detector circuit described eally give two readings: one for the difficult questions and one show subject general emotional state. As electrodes can be used two flexible wires, uninsulated wrapped around the fingers or wrist. Each change of....
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This smoke detector circuit diagram is based on the SD2 CMOS Photo-Electric Smoke Detector Integrated Circuit manufactured by Supertex INC and include almost all needed components to build a very simple and high efficiency smoke detector project. The LED....
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The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....
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This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes.....
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A simple thermometer built with operational amplifiers and a normal or protective diode such as 1N4148, instead of the temperature sensor can be made using electronic diagram below. A constant reference voltage is applied to the noninverting input of....
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This touch sensor switch can is designed using inverters (N1, N2)and some common electronic components. In standby state at the entrances of N1 there is a signal produced by oscillator N3/N4. At the touch sensor hand capacity forms a bridge to the ground for....
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This electronic liquid detector circuit diagram is based on the ULN2429 monolithic bipolar integrated circuit designed for detecting the absence or presence of many different types of liquids. The ULN2429 electronic liquid detector circuit can be used in....
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A very simple ultrasonic parking sonar electronic project can be designed using this schematic circuit. This ultrasonic parking sonar electronic project has an adjustable detection range from 5 cm up to 1. 5 meters and a detection angle of 5 degrees. This....
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This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the....
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A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the....
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Using this schematic electronic project can be designed a very simple water level indicator electronic circuit that uses a 7-segment display to indicate the water level (low, half and full)in the tank. This water level indicator electronic circuit shows the....
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This stereo balance indicator circuit diagram is designed using few common external components. The schematic circuit is very simple to build and will provide an visual indication with LEDs for left, right and center balance. Outputs from each channel are....
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This USB to Serial RS232 adapter is very useful in many situations we need to connect a device with RS232 to a computer without RS232 port, but with USB port. Using FT232BM chip manufactured by Future Technology Devices International we can make a very....
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It is good idea to put this circuit in a box and mark/write each LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will glow. The Number marked for glowing LED becomes dice`s output. Every time S1 is released, new LED....
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This is a simple but efficient Electronic lock. This lock can be used to protect any electronic systems from unauthorized usage. To get access the uses needs to know 8 digit pass-code or password. When the user enters correct 8 digit password followed by....
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From ages electron-magnetic relays are being used as switches to control high voltage devices. But, because of their bulky size and noise (both electrical and mechanical) people started using TRIAC with opto-coupler as better alternative. Above circuit uses....
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This is a very interesting and simple circuit. This also can be used in quiz events, where two participants hit their button to answer. The participant, who pressed his button first, will get a chance to answer first. This circuit will resolve which....
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Imagine you are relaxing and reading your favorite novel while listening to music on your computer, suddenly you want to skip the current song or want to pause your mp3 player. Infrared Software : This decodes the electrical signals and takes action to....
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12 Volts Lead Acid Battery Charger Circuit Except for use as a normal Batter Charger, this circuit is perfect to ‘constant-charge a 12-Volt Lea....
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When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the....
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12V Vehicle Electrical Wiring Tester Circuit This little tester is useful for checking vehicle electrical circuits. Two LEDs indicate whether....
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12W Amplifier Circuit Using 741 Op Amp A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the....
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Two LED CMOS Flasher Circuit Diagram This is a simple 2 led cmos robot ( flasher, multivibrator ) circuit using CD4069 six inverter....
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3V FM Transmitter Circuit This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is....
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4017 LED Knight Rider Running Light Circuit Diagram In this 4017 Knight Rider circuit, the 555 is wired as an oscillator. It can be adjusted to give....
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4033 7 Segment Common Anode Display Event Counter Circuit This circuit can count 0 to 9 with reset and display test....
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5 WAY AC FLASHER We use these types of circuits in most ceremonies (wesak festival, christmas, wedding, ). This 5 WAY AC FLASHER circuit....
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50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator....
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555 Negative Voltage Power Supply Circuit A negative supply can be generated by a ""Charge-Pump"" circuit created with a 555, diodes and....
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555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes....
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555 Timer With Audio Alarm Circuit Here is a very simple circuit for electronic timer with audio alarm. With the help of this circuit, audio....
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555 Variable Frequency Square Wave Generator This simple 555 Variable Frequency Square Wave Generator produces a variable frequency output of....
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This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
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741 Stereo PreAmplifier Circuit Diagram This preamp circuit provides better than 20dB gain in each channel. PARTS LIST R1 -....
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Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten....
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This microphone preamplifier incorporates automatic gain control, which keeps the output level fairly constant over a wide range of input....
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A portion of the op amp`s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed,....
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12V Battery Charge Nominal Discharge (Low) Indicator Circuit This circuit monitors car battery voltage. It provides an indication of nominal....
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Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency....
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Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one transistor carbon mic converter takes a carbon mic input and converts it to the magnetic variety. Note that no ground connection is used, even if the circuit is built....
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CD4060 Timer Circuit 1 minute to 2 hours This is a 1 minute to two-hour timer switch. The 14-stage binary ripple counter Type 4060, IC1, has an....
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Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to....
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Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS....
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need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending.....
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Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is....
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CXA1019 FM RADIO CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the....
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This circuit can control direction of a DC motor. This can operate the motor in both directions (Bi-direction) Clockwise and Anticlockwise (forward and back) ..
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Electronic Coin Toss Circuit Diagram This is electronic coin toss circuit using one CD4049 IC (Hex inverting buffer and TTL driver). This IC....
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Filament Light Dimmer Circuit This simple triac dimmer can be used to control incandescent filament lamps up to 200W. The circuit operates on....
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First Response Monitor, Input Selector, Game Circuit You can find first response using this circuit, because it helps many response monitor, games....
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Fluorescent Tube Light Circuit of an inverter that uses a single transistor and a single transformer. This type inverter can be made in various....
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This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body. ) Input coil L1....
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HeadPhone Amplifier OR PreAmplifier OutPut Stage This 1 watt amplifier lends itself par excellence for use as driver for low impedance headphone....
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In Circuit Transistor Tester Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor....
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Infrared Remote Control Switch Circuit Remote controls, specially cordless type, are very popular nowadays. Here is a simple and....
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Infrared Remote Control Tester Circuit This is a simple circuit you can build in order to test infrared remote controls. The circuit uses an....
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L200 12V Constant Voltage Battery Charger Circuit This battery charger is based on L200 regulator IC. L200 is a five pin adjustable voltage and....
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L200 Power Supply Regulator There are applications in which it is important for the supply voltage to be largely independent of the level of the....
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LED Blown AC Fuse Indicator Circuit Diagram This circuit monitors a AC fuse. In this circuit, the LED indicator shows whether or not the fuse is....
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LED STEREO SOUND LEVEL INDICATOR FOR AUDIO AMPLIFIER // Many circuits can be designed as level indicators by using a comparator IC or transistors but....
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LM1036 Stereo Tone ( Bass, Treble, Volume, Loudness, Balance ) Controller Circuit The LM1036 is a DC controlled tone (bass/treble), volume and....
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The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part....
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The microampere meter The microampere meter gives full scale deflection for 0.1 V input. The current to be measured is passed through a known....
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MOSFET Power Amplifier Circuit diagrams Two complementary MOSFETs are used to deliver 20W into 8?. PARTS....
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Musical Doorbell Circuit Diagram This musical doorbell circuit uses UM3481 A series IC. It is intended for applications such as toys, door....
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Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It....
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PIC Programmer Circuit diagram Following uJDM PIC programmer circuit is a circuit which suitable to do simple pic16f84, pic16f84A, 16c84,....
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Power Amplifier Speaker Protection Circuit Schematic While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge....
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SCR TESTER CIRCUIT The Device under test cathode, anode and gate are connected to the unit`s CATHODE, ANODE and GATE terminals,....
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Sensitive RF Voltmeter Probe Circuit This Circuit measures RF voltages beyond 200MHz and up to about 5V. PARTS....
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TDA7000 FM Radio Receiver Circuit Using Tuning Capacitor GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM....
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Bass Treble Tone Control Circuit A preamplifier circuit providing independent Bass and Treble tone controls is shown in this circuit. The....
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Here is a touch switch that can be used to drive LEDs, relays etc through a buffer transistor stage. It may be built around any CMOS inverter chip ..
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Transmitter RF Output LED Indicator Circuit Diagram This RF output detector circuit using a visual indicator can be useful for an RF....
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The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit....
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VCR Camera Video Detector Switch Controller Circuit This video detector switch controller circuit uses the video output from a VCR or camera to....
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Water Tank Level Indicator Circuit Diagram Simple, two-wire, remote monitoring unit,Three-LED level display, 9V battery powered Circuit....
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Note that there is very little in the way of protection circuitry and fuses in this amplifier. There is a short turn-on delay for the output power supply to minimise thumps, and a couple of line fuses, but no other protection. This is not recommended for....
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Lately The Peasant has been building a music synthesizer using vacuum tubes. Although this will be used as a percussion synthesizer, it could just as easily be controlled by a keyboard or a MIDI to CV convertor. The first module built is a dual VCO. It is....
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As electric utility companies grapple with the need to reduce greenhouse gas emissions and the increasing costs and lead-times for introducing new generating capacity they are turning to the concept of the smart grid. One of the core elements of the smart....
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18-year-old electrical engineer student, Chris Rieger, has been working on his levitating light bulb project ” fittingly referred to as the LevLight Project ” for about six months now. Recently he posted images and a video of the project, both of which....
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ICs with on-board oscillators requiring low-frequency fundamental crystals are commonplace, but nowG‚IC frequency multipliers require the higher frequencies of third overtone crystals. Compared to its fundamental implementation however, the third-overtone....
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A wide range of low-power industrial sensors and controllers are turning to alternative sources of energy as the primary or supplemental means of supplying power. Ideally, such harvested energy will eliminate the need for wired power or batteries altogether.....
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This article provides an overview of fluorescent dimming and an application circuit for low-end small fixture applications ICs where dimming levels below 10% are required and more comprehensive protection features are needed. The electronic ballast circuit....
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LED lighting, and the potential that it brings, is moving to the forefront of residential and commercial lighting markets. However, to maximize the success and adoption of solid-state lighting for retrofit lamps, the LED lamps should be capable of dimming....
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The different between these two IC`s. A Microcontroller is a specialized form of Microprocessor that is created to be self-sufficient and cost-effective, where a Microprocessor is typically designed to be general purpose use like in a Personal Computer (PC).....
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Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during....
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FETs can be found in the power section, LCD inverter, UPS, Amplifier, Monitor B+ and S-correction circuit, ATX power supplies and etc. When this component fails, one has to use a meter to test it to check if it is good, shorted, openor leaky. The meters can....
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This is a very simple -5V supply using one 555, useful for analog blocks using FET Opamps using low power. This circuit came up when i had to design limited by inventory. It worked well for its need. It converts Positive Five Volts to Negative Five Volts to....
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CD4538 is a dual Monostable Multivibrator. When you trigger the chip the output sends off one single pulse or one high-low event. The T+ pin 4 of U1a is the positive edge trigger or raising edge trigger input, the T- pin 5 is falling edge or negative edge....
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There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. This is the....
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This Circuit is a DPM or digital panel meter. It has a analog bar graph display and a 3-1/2 digit digital display. ICL7107 is used in the 200mV configuration. U4A opamp LF353 amplifies the 200mV Full scale input to the level required for the LM3914 display....
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This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get to use chips, experiment with some methods, which will help....
A very simple metal detector electronic project circuit can be designed using the CS209A integrated circuit manufactured by Cherry Semiconductor. The CS209A integrated circuit is a bipolar monolithic integrated circuit for use in metal detection proximity....
The op-amp IC1D shapes the frequency response to amplify those frequencies produced when motion is detected and rejects all others, such as those due to noise or slow temperature changes. When IC1D outputs a voltage higher than 1. 67V, it forces pin 8 and....
A very simple proximity detector can be made using this electronic scheme. This electronic circuit reacts to the presence of a conductive object within a particular field. Circuit sensitivity can be adjusted with potentiometer P1 for the desired distance.....
A very simple proximity detector electronic project can be designed using this schematic circuit. This proximity detector electronic project use a tone decoder integrated circuit ( NE567 ) that will provides a signal with a frequency about 100Khz. When an....
This rain detector electronic circuit project is an very simple alarm circuit, that will start an audio warning, if the liquid is present on the sense pad. This rain detector electronic circuit diagram is based on two transistors. When the sense pads....
This sensor switch circuit has nine channels and consist of only three integrated circuits and some resistors. Due to high input impedance, 74HC147 allows to use of 4. 7 M resistors to create a logic level "high" to sensor inputs. When one sensor is touched,....
This lie detector circuit described eally give two readings: one for the difficult questions and one show subject general emotional state. As electrodes can be used two flexible wires, uninsulated wrapped around the fingers or wrist. Each change of....
This smoke detector circuit diagram is based on the SD2 CMOS Photo-Electric Smoke Detector Integrated Circuit manufactured by Supertex INC and include almost all needed components to build a very simple and high efficiency smoke detector project. The LED....
The solar orientation circuit uses a comparator with window control that maintains engine idle as long as the two LDR`s (photoresist) are subjected to the same illumination. In this case, half the voltage is applied to the noninverting input of A1 and A2`s....
This metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. Output signal is determined by supply current changes.....
A simple thermometer built with operational amplifiers and a normal or protective diode such as 1N4148, instead of the temperature sensor can be made using electronic diagram below. A constant reference voltage is applied to the noninverting input of....
This touch sensor switch can is designed using inverters (N1, N2)and some common electronic components. In standby state at the entrances of N1 there is a signal produced by oscillator N3/N4. At the touch sensor hand capacity forms a bridge to the ground for....
This electronic liquid detector circuit diagram is based on the ULN2429 monolithic bipolar integrated circuit designed for detecting the absence or presence of many different types of liquids. The ULN2429 electronic liquid detector circuit can be used in....
A very simple ultrasonic parking sonar electronic project can be designed using this schematic circuit. This ultrasonic parking sonar electronic project has an adjustable detection range from 5 cm up to 1. 5 meters and a detection angle of 5 degrees. This....
This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the....
A very simple low cost water level indicator circuit can be designed using this schematic circuit. This water level indicator is based on a simple CMOS IC CD4066 and indicates the amount of water present in the overhead tank and also gives an alarm when the....
Using this schematic electronic project can be designed a very simple water level indicator electronic circuit that uses a 7-segment display to indicate the water level (low, half and full)in the tank. This water level indicator electronic circuit shows the....
This stereo balance indicator circuit diagram is designed using few common external components. The schematic circuit is very simple to build and will provide an visual indication with LEDs for left, right and center balance. Outputs from each channel are....
This USB to Serial RS232 adapter is very useful in many situations we need to connect a device with RS232 to a computer without RS232 port, but with USB port. Using FT232BM chip manufactured by Future Technology Devices International we can make a very....
It is good idea to put this circuit in a box and mark/write each LED with number 1 to 6. Now, when switch S1 is pushed momentarily, any one of the 6 LEDs will glow. The Number marked for glowing LED becomes dice`s output. Every time S1 is released, new LED....
This is a simple but efficient Electronic lock. This lock can be used to protect any electronic systems from unauthorized usage. To get access the uses needs to know 8 digit pass-code or password. When the user enters correct 8 digit password followed by....
From ages electron-magnetic relays are being used as switches to control high voltage devices. But, because of their bulky size and noise (both electrical and mechanical) people started using TRIAC with opto-coupler as better alternative. Above circuit uses....
This is a very interesting and simple circuit. This also can be used in quiz events, where two participants hit their button to answer. The participant, who pressed his button first, will get a chance to answer first. This circuit will resolve which....
Imagine you are relaxing and reading your favorite novel while listening to music on your computer, suddenly you want to skip the current song or want to pause your mp3 player. Infrared Software : This decodes the electrical signals and takes action to....
12 Volts Lead Acid Battery Charger Circuit Except for use as a normal Batter Charger, this circuit is perfect to ‘constant-charge a 12-Volt Lea....
When the potentiometer is at the up position, the capacitor will charge quickly through both 1k resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer is at the....
12V Vehicle Electrical Wiring Tester Circuit This little tester is useful for checking vehicle electrical circuits. Two LEDs indicate whether....
12W Amplifier Circuit Using 741 Op Amp A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the....
Two LED CMOS Flasher Circuit Diagram This is a simple 2 led cmos robot ( flasher, multivibrator ) circuit using CD4069 six inverter....
3V FM Transmitter Circuit This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is....
4017 LED Knight Rider Running Light Circuit Diagram In this 4017 Knight Rider circuit, the 555 is wired as an oscillator. It can be adjusted to give....
4033 7 Segment Common Anode Display Event Counter Circuit This circuit can count 0 to 9 with reset and display test....
5 WAY AC FLASHER We use these types of circuits in most ceremonies (wesak festival, christmas, wedding, ). This 5 WAY AC FLASHER circuit....
50 Hz 60 Hz frequency generator circuit using crystal oscillator You can generate 50Hz or 60Hz using this frequency generator. This oscillator....
555 Negative Voltage Power Supply Circuit A negative supply can be generated by a ""Charge-Pump"" circuit created with a 555, diodes and....
555 Timer Time Delay Circuit LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SW2, makes....
555 Timer With Audio Alarm Circuit Here is a very simple circuit for electronic timer with audio alarm. With the help of this circuit, audio....
555 Variable Frequency Square Wave Generator This simple 555 Variable Frequency Square Wave Generator produces a variable frequency output of....
This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,....
741 Stereo PreAmplifier Circuit Diagram This preamp circuit provides better than 20dB gain in each channel. PARTS LIST R1 -....
Accurate 50Hz Oscillator Circuit Using 555 And 7490 This circuit is a getting a 50Hz pulse. It comprises a 555 timer and two 7490 divide-by-ten....
This microphone preamplifier incorporates automatic gain control, which keeps the output level fairly constant over a wide range of input....
A portion of the op amp`s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed,....
12V Battery Charge Nominal Discharge (Low) Indicator Circuit This circuit monitors car battery voltage. It provides an indication of nominal....
Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency....
Good pitching beats good hitting and a good magnetic mic beats a good carbon mic. This one transistor carbon mic converter takes a carbon mic input and converts it to the magnetic variety. Note that no ground connection is used, even if the circuit is built....
CD4060 Timer Circuit 1 minute to 2 hours This is a 1 minute to two-hour timer switch. The 14-stage binary ripple counter Type 4060, IC1, has an....
Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to....
Colpitts 1MHz To 20 MHz Crystal Oscillator Circuit This is a simple Colpitts crystal oscillator for 1 to 20 MHz, PARTS....
need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending.....
Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is....
CXA1019 FM RADIO CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the....
This circuit can control direction of a DC motor. This can operate the motor in both directions (Bi-direction) Clockwise and Anticlockwise (forward and back) ..
Electronic Coin Toss Circuit Diagram This is electronic coin toss circuit using one CD4049 IC (Hex inverting buffer and TTL driver). This IC....
Filament Light Dimmer Circuit This simple triac dimmer can be used to control incandescent filament lamps up to 200W. The circuit operates on....
First Response Monitor, Input Selector, Game Circuit You can find first response using this circuit, because it helps many response monitor, games....
Fluorescent Tube Light Circuit of an inverter that uses a single transistor and a single transformer. This type inverter can be made in various....
This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body. ) Input coil L1....
HeadPhone Amplifier OR PreAmplifier OutPut Stage This 1 watt amplifier lends itself par excellence for use as driver for low impedance headphone....
In Circuit Transistor Tester Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor....
Infrared Remote Control Switch Circuit Remote controls, specially cordless type, are very popular nowadays. Here is a simple and....
Infrared Remote Control Tester Circuit This is a simple circuit you can build in order to test infrared remote controls. The circuit uses an....
L200 12V Constant Voltage Battery Charger Circuit This battery charger is based on L200 regulator IC. L200 is a five pin adjustable voltage and....
L200 Power Supply Regulator There are applications in which it is important for the supply voltage to be largely independent of the level of the....
LED Blown AC Fuse Indicator Circuit Diagram This circuit monitors a AC fuse. In this circuit, the LED indicator shows whether or not the fuse is....
LED STEREO SOUND LEVEL INDICATOR FOR AUDIO AMPLIFIER // Many circuits can be designed as level indicators by using a comparator IC or transistors but....
LM1036 Stereo Tone ( Bass, Treble, Volume, Loudness, Balance ) Controller Circuit The LM1036 is a DC controlled tone (bass/treble), volume and....
The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part....
The microampere meter The microampere meter gives full scale deflection for 0.1 V input. The current to be measured is passed through a known....
MOSFET Power Amplifier Circuit diagrams Two complementary MOSFETs are used to deliver 20W into 8?. PARTS....
Musical Doorbell Circuit Diagram This musical doorbell circuit uses UM3481 A series IC. It is intended for applications such as toys, door....
Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It....
PIC Programmer Circuit diagram Following uJDM PIC programmer circuit is a circuit which suitable to do simple pic16f84, pic16f84A, 16c84,....
Power Amplifier Speaker Protection Circuit Schematic While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge....
SCR TESTER CIRCUIT The Device under test cathode, anode and gate are connected to the unit`s CATHODE, ANODE and GATE terminals,....
Sensitive RF Voltmeter Probe Circuit This Circuit measures RF voltages beyond 200MHz and up to about 5V. PARTS....
TDA7000 FM Radio Receiver Circuit Using Tuning Capacitor GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM....
Bass Treble Tone Control Circuit A preamplifier circuit providing independent Bass and Treble tone controls is shown in this circuit. The....
Here is a touch switch that can be used to drive LEDs, relays etc through a buffer transistor stage. It may be built around any CMOS inverter chip ..
Transmitter RF Output LED Indicator Circuit Diagram This RF output detector circuit using a visual indicator can be useful for an RF....
The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit....
VCR Camera Video Detector Switch Controller Circuit This video detector switch controller circuit uses the video output from a VCR or camera to....
Water Tank Level Indicator Circuit Diagram Simple, two-wire, remote monitoring unit,Three-LED level display, 9V battery powered Circuit....
Note that there is very little in the way of protection circuitry and fuses in this amplifier. There is a short turn-on delay for the output power supply to minimise thumps, and a couple of line fuses, but no other protection. This is not recommended for....
Lately The Peasant has been building a music synthesizer using vacuum tubes. Although this will be used as a percussion synthesizer, it could just as easily be controlled by a keyboard or a MIDI to CV convertor. The first module built is a dual VCO. It is....
As electric utility companies grapple with the need to reduce greenhouse gas emissions and the increasing costs and lead-times for introducing new generating capacity they are turning to the concept of the smart grid. One of the core elements of the smart....
18-year-old electrical engineer student, Chris Rieger, has been working on his levitating light bulb project ” fittingly referred to as the LevLight Project ” for about six months now. Recently he posted images and a video of the project, both of which.....jpg "Advantages and challenges of third-overtone IC crystals")
ICs with on-board oscillators requiring low-frequency fundamental crystals are commonplace, but nowG‚IC frequency multipliers require the higher frequencies of third overtone crystals. Compared to its fundamental implementation however, the third-overtone....
A wide range of low-power industrial sensors and controllers are turning to alternative sources of energy as the primary or supplemental means of supplying power. Ideally, such harvested energy will eliminate the need for wired power or batteries altogether.....
This article provides an overview of fluorescent dimming and an application circuit for low-end small fixture applications ICs where dimming levels below 10% are required and more comprehensive protection features are needed. The electronic ballast circuit....
LED lighting, and the potential that it brings, is moving to the forefront of residential and commercial lighting markets. However, to maximize the success and adoption of solid-state lighting for retrofit lamps, the LED lamps should be capable of dimming....
The different between these two IC`s. A Microcontroller is a specialized form of Microprocessor that is created to be self-sufficient and cost-effective, where a Microprocessor is typically designed to be general purpose use like in a Personal Computer (PC).....
Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during....
FETs can be found in the power section, LCD inverter, UPS, Amplifier, Monitor B+ and S-correction circuit, ATX power supplies and etc. When this component fails, one has to use a meter to test it to check if it is good, shorted, openor leaky. The meters can....
This is a very simple -5V supply using one 555, useful for analog blocks using FET Opamps using low power. This circuit came up when i had to design limited by inventory. It worked well for its need. It converts Positive Five Volts to Negative Five Volts to....
CD4538 is a dual Monostable Multivibrator. When you trigger the chip the output sends off one single pulse or one high-low event. The T+ pin 4 of U1a is the positive edge trigger or raising edge trigger input, the T- pin 5 is falling edge or negative edge....
There are three Controls to be Adjusted to make a Proportional Flow Controller Perform Properly. This method has to be practiced and experience gained from it can be used to get very good and stable Control of the Flow or Velocity of a Fluid. This is the....
This Circuit is a DPM or digital panel meter. It has a analog bar graph display and a 3-1/2 digit digital display. ICL7107 is used in the 200mV configuration. U4A opamp LF353 amplifies the 200mV Full scale input to the level required for the LM3914 display....
This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get to use chips, experiment with some methods, which will help....