Top Circuits Page 143
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This hybrid DRM receiver with a single valve and a single transistor features good large-signal stability. The EP95 (US equivalent: 6AK5) acts as a mixer, with the oscillator signal being injected via the screen grid. The crystal oscillator is built around a....
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Completely self-supporting garden lamps using solar cells as their energy source are gradually becoming more and more common. How do they actually work We took one apart to ¬nd out. From environmental and technical considerations, buying such a solar-cell....
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At the heart of this over heat detector circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. The LM35 develops an....
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This circuit senses AC audio voltage supplied to the car-radio loudspeakers and displays it as power using a LED bar graph, achieving at the same time an attractive visual effect. It is designed to cover common car-radio output power ranges, but can easily....
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The test beeper generates a sinusoidal signal with a frequency of 1, 000 Hz, a common test frequency for audio amplifiers. It consists of a classical Wien-Bridge oscillator (also known as a Wien-Robinson oscillator). The network that determines the frequency....
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This electronic game is simulation of one-arm bandit game. Electronics hobbyists will find it very interesting. When toggle switch S1 is in run` position, all segments of 7-segment displays (DIS1 through DIS3) will light up. On turning toggle switch S1 from....
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LPG gas is supplied in pressurized steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause fire or suffocation if not dealt with. Here is a....
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This add-on circuit enables remote switching on/off of battery-operated toy cars with the help of a TV/video remote control handset operating at 30 40 kHz. When the circuit is energised from a 6V battery, the decade counter CD4017 (IC2), which is configured....
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Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan or the tubelight. Here is a simple circuit to remotely switch on/off any electrical device through a relay using....
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This simple circuit and program listing allows the Maximite microcomputer (SILICON CHIP, March-May 2011) to control a stepper motor. It could be expanded to allow for the control of multiple motors, with four of the Maximite`s external I/O pins used to....
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This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3. 5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199. 9V with a resolution of 0. 1V. The voltmeter is....
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The transmitter circuit uses Microchip`s dsPIC33FJ16GS504 for the analog-to-digital conversion of the input signals on two channels. The processed data on the dsPIC are then transmitted to the phone (for waveform display) via the LMX9838 bluetooth SPP....
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The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where you can plug-in your 120V AC appliance and control....
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40kHZ one ultrasonic transmitter circuit, the F1 ~ F3 three oscillators in the F3 is 40kHZ square wave output, frequency mainly by C1, R1 and RP decided to adjust the adjustable resistance with a frequency of RP. F3 transducer excitation output T40-16 at one....
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The switches and LEDs are here because they are mounted on the same front panel as the display. The "D" connetor, however, is at the rear. The two switches are momentary downwards, but latch upwards. I like to buy assortments cheaply, in this case single....
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This circuit is design for provide automatic current limiting up to 8. 4A. Unlike current limiter that uses only a resistor, this current limiting circuit doesn`t drop the voltage, or at least keep the voltage drop at minimum, until a certain current amount....
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This circuit is describes about sensing air flow using microcontroller PIC16C781. In this circuit is using Programmable Switch Mode Controllers (PSMC) that combination between the Integrated Operational Amplifier, Digital-to-Analog Converter (DAC), and gated....
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An analog to digital converter converts an analog input voltage into a digital value. This is a circuit for shows the analog to digital converter. This circuit is using microcontroller ATmega8 for control the operation. This is the figure of the circuit. The....
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This is a circui for audio frequency meter. This circuit uses 555 IC as a mono stable multi vibrator (one-shoot trigger). A mono stable multi vibrator can act as a frequency-to-voltage converter because it produces a fixed pulse width, with the repetition....
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This is a simple design of audio level meter. This circuit uses just one IC and a very few number of external components. This circuit is based on LM3915 as controller in the operation of the audio level meter circuit. It displays the audio level in terms of....
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This circuit in below uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay settings is not easily....
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This is a design for thermometer. This is a simple circuit design. This circuit is based on temperature sensor using LM35 Ic. If you have a digital voltmeter, or any voltmeter with millivolt resolution and high input impedance, then you can use this....
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This a application circuit for calibration. This circuit is called high voltage AC calibrator circuit. In another dimension in sine wave oscillator design is stable control of amplitude. This is the figure of the circuit. In this circuit, not only is the....
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This is a complete circuit that is shown in the diagram below and is formed by a microphone amplifier built around IC1A, is a design for intercom circuit. In this circuit, there are 2 IC, LM358 that is used to low power dual op amp and 4016 or 4066 Quad....
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This is circuit design for a laser diode driver can be implemented using voltage-controlled current source. This simple linear laser diode driver gives cleaner drive current than a switched (PWM) drivers. This circuit is based on OPA350 IC. This is the....
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This light sensor circuit that is photos sensor is the gap between light and electronics. This circuit is built by op amp and microcontroller PIC16C63 for control the sensor. This circuit is not precision application, but they can be effectively used in....
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This is a design circuit for intercom circuit. The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable....
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This circuit in below is show the simple form of the thermometer circuit. The circuit is based on LM335 as sensing the temperature. This is the figure of the circuit. The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is....
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This is a design circuit for sine wave oscillators that will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 KHz. The frequency of oscillation is easily tuned by varying a single resistor. This circuit is controlled by....
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This is a design sensor circuit that can be used for sensing the light. This circuit is using a comparator LM311. This circuit is very simple design. This is the figure of the circuit. This comparator is powered from 12 V DC supply and does not require....
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This circuit is design for same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps. This circuit is control using relays. This is the figure of the circuit. The relay shown in the diagram is a Radio Shack 3 amp....
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This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. This circuit is like as equalizer bands. Here`s the circuit diagram of the audio equalizer....
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Any NPN transistor can be used. The author used a 2N3904, but a 2N2222A should work just as well. A good, low noise transistor would be even better. Some radios only have three connections to their ferrite bar antenna: the antenna connection to the tuning....
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This circuit is design circuit for low drop out charger using a MOSFET as the pass element, but this circuit does not include current limiting. This is the figure of the circuit. This circuit is a simple design. This circuit uses Q3 and a Schottky diode to....
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This is design circuit for UHF transmitter circuit. The TV transmitter circuit is working on the UHF channel, 470-580 MHz frequency channel 21-34. This transmitter can radiate as far as 30-100 meters by using a cable 10-20 cm. This is the figure of the....
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This is a design circuit for a stereo amplifier for a high sensitivity stereo parabolic microphone. This circuit can be used for listening to distant sounds. Typical parabolic microphones are mono phonic, this unit has a stereo audio path that helps produce....
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This is design circuit for converter meter voltage to frequency. Normally we often encountered the frequency meter can be used in speed sensor, tachometer, measurement or signal recurring. This frequency to voltage converter (FVC) can be used to change the....
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This is a design for sawtooth generator circuit. The advantage of this circuit is low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. This is the figure of the circuit. A....
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This is a design circuit for soft light dimmer. This circuit uses the IGBT STGP10N50A and the TS555 timer as main components. The timer is triggered on the zero crossing voltage pulse. The time constant determined by C5/R14+R15 that is used to determine the....
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This is a design for sensor circuit. This circuit is using LED for sensor a light. But, for control operation and amplifier the output is using 1458 IC. This is an op-amp. This is the figure of the circuit; A circuit that is takes advantage of the....
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This is design circuit of bias current compensation circuit. This circuit can operate from MW source resistances with little increase in the equivalent offset voltage. This circuit is based on LM11. This is the figure of the circuit. This is impressive....
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This is a design of metal detector requires alone a scattering of apparatus and an evening`s work. Congenital about a cmos4011 IC, is actual able-bodied and versatile. The 250 kHz advertence oscillator is congenital with two gates (U1/1 and U1/2), C1, R1 and....
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This is a circuit for voice transmitter using a pair of BC548 transistors in this circuit. Although not strictly RF transistors, they still give good results. I have used an ECM Mic insert from Maplin Electronics, order code FS43W. It is a two terminal ECM,....
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Intercom walkie talkie are the next logical step in this discussion. They show how a crystal oscillator can be used to transmit voice. Transmitting a voice via a crystal locked oscillator is not easy. This is because the crystal is locking the frequency and....
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This is a design circuit for a simple 27MHz transmitter producing a carrier. The circuit can produces an unmodulated 27MHz signal and when picked up by a receiver. This is the figure of the circuit; The transmitter is a very simple crystal oscillator. The....
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R1 15k ohm resistor. NTC Thermistor- 10k ohm, sold at Radio Shack in the states. P1 10k ohm potentiometer - sets the low speed(voltage) of the fans at the cool temperature. P2 50K ohm potentiometer - sets the gain of the circuit - how fast the voltage will....
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This is a design circuit for digital voltmeter circuit. The integrated circuit ICL7107 is a 3-1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers. The....
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This is design circuit for a low-cost voltage reference circuit. Its main component is a general-purpose operational amplifier, the 741, configured to output a buffered fixed reference voltage for use by other IC`s or circuits, such as an Analog-to-Digital....
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This is a circuit that can be used for detecting sounds and providing an output signal when a sound is detected. This output signal may be fed to another circuit that sets off an alarm when the signal is received. This circuit is therefore useful in security....
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This is a design circuit for a temperature sensor circuit that uses an LM335, an IC that converts the ambient temperature into an equivalent output voltage. The voltage output of an LM335 increases by approximately 10 mV for every 1 degree Kelvin of rise in....
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This is a design circuit for tone/frequency detector (decoder) circuit that can be used to detect the presence of a signal with a certain tone. The output of the circuit will be active if the signal is the same tone with the tone of a series of internal....
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Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply, since the motor is synchronized with the line frequency. Three phase ac motor speed controller is actually nothing more than three phase sine wave....
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This is a circuit for an LM1893 power line modem circuit. This circuit is used to transfer information between remote location by using the power mains. This circuit uses LM1893 that is used as a power line interface for half-duplex (bi-directional)....
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This is a figure for a block diagram of a modern automated systems incorporate closed-loop feedback for motion control. They typically include a servo system that consist of feedback elements and motor driver combined in a manner. This will give accurate and....
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This circuit is design circuit for a differential analog circuit switches. The FM1208 monolithic dual differential multiplexer used in applications where the RDS (ON) must be the same match. Since RDS (ON) for monolithic dual tracks at better than 1% of the....
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This is a design circuit for digital voltmeter with LED display. It`s ideal to use for measuring the output voltage of your DC power supply. It includes a 3. 5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199. 9V....
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This is a design circuit for a low cost fm antenna booster that can be used to listen to programs from distant FM stations clearly. The antenna fm booster circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570....
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This is a design circuit for the FSK demodulator, that is the electronics device that converts the FSK signal to serial digital signal. To transmit digital serial data we use FSK modulation and to get back the digital data at the receiver, we need to....
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This is a design circuit for measure inductance of the inductor labeled LX which is the inductance to be measured. The o/p of the circuit is a TTL square wave whose frequency relates to the inductance being measured. The inductance meter adapter output is....
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Here`s a design circuit for temporary lamp circuit is very helpful in emergency situation or in any application where we don`t have much time to turn off the lamp. Just press the push button, do a little fast task, and then leave it. This circuit hold the....
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This is a circuit that used to main pulse. The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes. This is useful, for instance, when a mains-operated equipment is to be tested for long....
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This is a circuit for an electrically operated rolling shutter usually has a standard control panel with a three-position switch: up, down and stop. If you would like to automate the opening and closing with a time controlled switch, a few additional wires....
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Here`s an another project, which makes an Scrolling LED display. Here 64 leds which are connected to an Matrix display. The Anodes are drived through an Driver IC UDN2981 and the cathodes are drived through ULN2803. The Atmega8515 is used in this project to....
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This project is used to automate the home appliances through Bluetooth enabled PC. You can use the USB Bluetooth at the PC side and an Serail Bluetooth converter is used at the microcontroller side. The sparkfun bluetooth module is used here, but you can use....
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The ability to be able to read a 125Khz access card or keyfob at a large distance involves numerous factors including reader antenna size, radiated power, receiver sensitivity and the like. The reader cloner shown on the previous web page has the benefit of....
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The picture below is of my prototype combination card reader and cloner. The unit is self contained and does not require the use of a PC or other external equipment to operate. Operation is simple and straightforward. Simply hold a card near the antenna and....
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For those who want LED-based footswitching without the hassle of installing a battery, I am currently working on a battery-less LED-based footswitch modification for the 2-Channel amps that works with the existing TRS jack and footswitch. This solution will....
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We have acquired a conventional 250 pound tension / compression load cell (LPU-250) based on a 350 Ohm strain gage bridge. We are in the process of constructing a simple DC-accurate amplifier to convert the low level output of the strain gage to a 0-5V....
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The "recovery node" is the pyrotechnic controller board designed for LV2. LV2 uses two different parachutes during its descent. The drogue chute opens first. The drouge is a small parachute that stabilizes the rocket but allows it to fall at a fairly high....
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The intelligent temperature sensor DS18S20 from Dallas semiconductor is a calibrated precise two resp. three pin device that interfaces direchtly to microcontrollers or PCs producing Celsius readings. The so-called 1-wire protocoll (better "one DATA wire. )....
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Public Lab is an open community which collaboratively develops accessible, open source, Do-It-Yourself technologies for investigating local environmental health and justice issues....
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There are many kinds of AVR programmers in market, most of these use the parallel port, a serial port (COM port), or the USB but they are very costly and hobbyist like me can not buy such a costly programmer so i decided to make a cheap AVR programmer. Being....
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It is important yet to mention that the 74HC240 can drive directly an IRF510 FET transistor being able to give until 10W. Another application is using it to drive a balanced diode mixer, which needs a considerable power drive, easily supplied by a 74HC240....
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My mobile rig, a Kenwood TM-D710E, needed a GPS receiver for APRS use. The GPS-710 wasn`t readily available and, besides, is quite expensive. I therefore decided to build my own. I found a Royaltek RGM-3600 GPS receiver on eBay for less than £20. This is a....
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Xenon lamp, strobe light circuits, xenon strobe, photo flash, photoflash,schematics or diagrams, all free to use. My inspiration came from a strobe circuit that was in a school fire alarm....
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This video demonstrates how to bring up multiple instances of QsoNet`s Dahdidah Cw Software Keyer using FABULATECH`s VIRTUAL SERIAL PORT SPLITTER. Four separa....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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