Popular Circuits
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Once the circuit gets current, all variables are initialized and the loop function is continually running. Initially all LEDs are off and there is no signal at the output. By pressing the signal switch, the first light that shows the most signal is at the.... -
Fast rise-time high-voltage pulses have many uses ranging from EMC testing to device characterization. The simple, low-cost circuit described here deals with the latter. It`s able to generate 0- to 1000-V pulses with currents up to 50 A, and a rise time of.... -
The calibrator can be used to check the accuracy of a time-base generator, as well as to calibrate the input level of amplifiers. The calibrator consists of an NE555 connected in the astable mode. The oscillator is set to exactly 1 kHz by adjusting.... -
This is how I designed a simple circuit that allows you to control a servo and put it through its paces.... -
The circuit shown in the chart is 1kHz sine wave oscillator circuit. Basing on the double-T circuit, the circuit using 741ordinary operational amplifier to produce 1000Hz sine wave output. Adjusting 100k? potentiometer will make circuit start oscillation,.... -
This manual is for use by authorised Sinclair dealers. engineers and representatives as a guide to rectifying faults on the Sinclair ZX Printer. Repair/renewal procedures are limited to those which are specific to this printer; standard procedures for the.... -
Infrared Remote Control for operates on 115 volts AC. This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared... -
The power Amplifier hi-fi OCL 120W rms sizes really, if use power supply circuit at enough good and use 8ohm size prominent point interesting loudspeakers. Of the circuit be use the transistor entirely have no the integrated circuit mixes. Then make bland.... -
EIA/TIA-422 defines a Balanced (differential) interface; specifying a single, unidirectional driver with multiple receivers (up to 32). RS-422 will support Point-to-Point, and Multi-Drop circuits, but not Multi-Point [ EIA485 ]. EIA-485 devices may be used.... -
The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors... -
In this circuit 4017 CMOS decade counter can be used to build a timer circuit. Push-button S1 will discharge capacitor C1 through resistor R2 .... -
The Traffic light controller section consists of 12 Nos. point LEDS are arranged by 4Lanes in PS/8051 Trainer kit. Each lane has Go (Green), Listen (Yellow) and Stop (Red) LED is being placed. Microcontroller BoardsThe PS-8051 board which demonstrates the.... -
Create simple Hello world example of serial comm to a PC using microcontroller USART... -
When someone touches the touchplate (TP), the resistance of his finger across points A and is added in series to the combination of Rl and R2, the capacitor C2 begins to charge. When the voltage across Cl is finally sufficient to fire NE1, Cl will begin to.... -
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TheM-8880 is a completeDTMF Transmitter/Receiver that fea- tures adjustable guard time, Automatic Tone burst mode, call progressmode, and a fully compatible 6500/6800microproces- sor Interface The receiver portion is based on the industry stan- dard M-8870.... -
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.... -
This novel circuit uses a flashing LED as the clock input for a 4017 decade counter. Typical flashing LEDs (eg, DSE cat Z-4044) flash at about 2Hz so the outputs Q0-Q9 will cycle through at that rate. For example, Q0 will turn on for half a second, then Q1,.... -
Field strength meter is extremely useful when working with RF devices. It can be used to quickly diagnose whether a transmitter circuit is working, and can be used to detect RF signals in the environment. The simplest field strength meter could be built with.... -
Most off-the-shelf car battery chargers cannot not be left connected to the battery for long periods of time as over-charging and consequent battery damage will occur. This add-on circuit is placed in series with the battery being charged and is powered by.... -
The following circuit shows about IC BA1404 For Stereo FM Transmitter Circuit Diagram. Features: easy enough for everyone to build, has a .... -
Hello I was, since few months, looking for an easy to build PWM inverter, and without any PIC programing. Looking at a 555 PWM amp circuit, I have an.... -
This analog sequencer was designed with the idea of cooperative play in mind. It can be used as a standalone instrument, or linked together with other sequencers running on the same clock speed. Mark Kleback and I were working separately working on.... -
Controllable gain amplifier is an automatic gain control circuit of the execution unit, the main method of controlling the gain of the amplifier in two ways: One way is through.. -
The circuit works as follows: every morning, light shines into the silicon photocell, generating a force, this force will transistor VT1 conduction,.. -
The charging circuit stops automatically when the battery is fully charged. So you can leave the emergency light connected to AC mains overnight without any fear. The circuit can be divided into inverter and charger sections. The inverter section is built.... -
The MFOS NOISE TOASTER circuit consists of seven main components: a voltage controlled oscillator, a white noise generator, a voltage controlled low pass filter, a low frequency oscillator, a simple AR envelope generator, a simple VCA, and a one watt.... -
LTC3202 is Linear TECHNOLOGY company does not need a charge pump gated oscillator Pictured LTC3202 charge pump using a lithium-ion battery-powered white LED driver circuit... -
The controller is entirely hardware based, and provides the typical sequencing for a standard 3-light traffic signal. I built this traffic light controller / sequencer when I was firstlearning electronics, and it is what I would consider a crude and ugly.... -
CELLPHONE OPERATED LAND ROVER (MOBILE PHONE OPERATED ROBOT). In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot.... -
One section of the precision audio frequency generator uses an electret microphone element to pick up audio from the piano. That signal is then processed and sent to one channel of a dual-trace oscilloscope. The other section of the circuit is used to.... -
Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around 10dB at 10K and 50Hz. As the controls are passive, the last transistor provides a slight boost. The output is designed to feed an amplifier with input.... -
As shown for the electronic components made by conventional electronic bonsai, on the living room, sparkle, brilliance make houseful, joys and pleasures of life. Components Sel.. -
For the first version of my Open Source Framework for USB Generic HID devices based on the PIC18F and Windows I made a quick example of how to use the library using a USB interface for an LCD. Now that I`ve completed the second version of the library I.... -
This design was published in the June 1994 issue of Electronics Australia, and has proven extremely popular. The kit was sold by Jaycar Electronics, but has since been discontinued. It is a simple device that connects between your keyboard and VGA card.... -
SH Hall opened with a double silicon output interface circuit.. -
Automatic temperature control circuit shown in Figure 1-7, for climate control thermostat. (1) control purposes and methods of control objects: electric heater EH. Control purp.. -
This is a low-cost project for 20 or 40 watt fluorescent tubes. However the most efficient is to use a 40 watt tube (or two 20 watt tubes in series). It`s a circuit you can put together from junk box components or build from a kit. It`s very simple to build.... -
This is a simpler repeating timer circuit. It uses just one Cmos IC - wired as an asymmetric oscillator. The length of time the relay remains energized - and the length of time it remains de-energized - are set independently.... -
Requires that DC power be brought into the instrument, either through special cabling or an internal battery. Should not be done to collectible instruments if they didn`t come with onboard electronics. Conveniently implemented as a field effect transistor.... -
In this case, the NE602 is used in this superhet front-end configuration. Ul serves as a frequency conve.. -
Amplifier circuit using ic STK4065 above that which the amplifier circuit uses only ic, or also could be called this series do not have equality in the use of ic. Power amplifier output power 35Watt supplied with a voltage of 13. 5 volts DC. Impedance of the.... -
This FM radio-controlled anti- annexation anxiety can be acclimated with any agent accepting 6- to 12-volt DC accumulation system. The mini VHF, FM transmitteris adapted in the agent at night back it is anchored in the car balustrade orcar park. The receiver.... -
This circuit shows a DS1236 that is used to monitor and control the power-supply and software execution of a processor-based system, and to provide a pushbutton reset. When an out-of-tolerance condition occurs (when VCC is below 4. 5 V for 10% operation, or.... -
1.5V-powered microphone signal amplifying circuit 1.V power supply shown for the microphone signal amplifying circuit, which by VT2, VT3 differential amplifier is constituted o.. -
In this issue, we feature articles on a variety of measurement-and sensor-related embedded design projects. I encourage you to try similar projects and share your results with our editors. Starting on page 14, Petre Tzvetanov Petrov describes a multilevel.... -
The Encoder and Decoder are different kind ofcombinationalcircuits which are used to convert binary information to decimal, octal and hexa decimal andvice-versa. A decoder iscombinationalcircuitwhich is used for to convert n it binary information to 2n.... -
Based on this `manual` PCR machine I built a few weeks ago, the Light Bulb PCR machine uses a light bulb and an old computer fan as its heating and cooling elements: Instead of the switches pictured above, the unit is now controlled by an Arduino Uno, Code.... -
An equalizer is a device that allows you to adjust the gains of individual frequencies. You may want to lower bass, so on an equalizer, you would go to the frequency range of bass, which may be around 500Hz and turn down the volume. If you want to increase.... -
As shown in the circuit with 24 300 in Europe, a 0.5W resistor in parallel as a heating element R7 buried in the sand bunk aquariums with 24V bulbs connected to both ends of th.. -
This High Voltage power supply is able to generate up to 25-30kV DC Output from a 12-24v DC input. With a fully adjustable DC input power supply (0-24V/4A), it is possible to adjust the HV output between 5 to 30kV. This HV power supply use a common flyback.... -
Here`s simple FM transmitter circuit using medium power 2N2218 transistor. Micropohone is of electret type that connects to two input terminals and the antenna should be a copper wire from 15 to 40 cm. Below is schematic circuit of the fm transmitter.... -
Achieve communication between MCU and accelerometer trough I2C nor SPI. I observed that shorting PLL filter input in device causes no effect on both gyro readings and operation. My assumption is that PLL is present only in accelerometer part of the device. I.... -
The TPS3803 and TPS3805 families of Supervisory Circuits provide circuit initialization and Timing supervision, primarily for DSPs and processor-based systems. The TPS3803G15 device has a fixed-sense threshold voltage VIT set by an internal voltage divider,.... -
A simple stereo tv decoder circuit build with MC1310P. Transistor Q1 is an audio amplifier and U1 is used as a 31. 5KHz subcarrier which is similar to 38KHz FM MPX. Pilot frequency is 15. 734KHz. No, it cannot be used with the to decode the stereo signal..... -
Nowadays, USBis the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, "use a.... -
Hello all, I would like to built a sound generator for my Room Monitoring system.Can someone suggest me any electronic design as I would not like to use HT2810 or H.... -
The unit has a separate amplifier and oscillator section allowing them to be used separately if need be. The injector is a multivibrator running at 1 kHz, with R5 andR6 dividing down the output to a suitable level («1V). The tracer is a single-stage.... -
My current vehicle, a Pajero, was modified for dual fuel - ie, petrol and gas. However, it`s necessary to run the vehicle on petrol at regular intervals to stop the injectors from clogging up. This simple circuit allows the vehicle to be started using petrol.... -
The meaning of Frequency Shift Keying (FSK) is transmitting digital data over a signal path (two wires, telephone lines, AM or FM transmitter). Typically, there are only two signals transmitted. One corresponds to a logical 1 ³. the other to a logical 1 ³..... -
The three schematics represent three building blocks for a 10-meter SSB transmitter. Or these blocks can be used separately as circuit modules for other transmitters. The VFO board uses an FET transmittal oscillator, the VFO signal is mixed in an NE602.... -
Pachisi game is designed for two persons. Each player has one figurine; the figurines are found in the early game on positions indicated by arrows. The goa.... -
The plan is to have some plant sensing working for a groworld installation we are doing at Camp Pixelache so I`ve made the circuitry a little more durable with a bit of soldering: Here`s the circuit diagram the values of components are influenced by what I.... -
Building a stable noise generator for audio-frequency purposes requires only a few components. The circuit in Figure 1 relies on linear-feedback shift registers and some simple software. An eight-pin Microchip (www.microchip.com) PIC12C508 controller (IC2).... -
UPS Schematic Circuit Diagram for 3000 Watts UPS It can also work for 1000 VA with minor modifications... -
The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB400 (Hawk II). It shows the connection between Honda parts such as the turn signal, emergency stop switch, starter button, spark plug, capacitor discharge ignition.... -
How many have had legitimate problems with the 555 timer? Let me guessit involved the reset line, did it not? We all know that pin 4 must be set high befo.... -
This project aims to build an IR interval timer which can be used to capture images such as time lapse movies of sunrise or sunrise and the night sky. The.... -
his handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it ca.... -
Hi there, I have a preamp circuit that is part of a powered subwoofer that is making a static/popping noise. It sounds similar to the scratchy, dirty.... -
The most simply way to collect all this free available energy is to use solar cells. One good solar cell in combination with one well configured hho generator can produce a lot of gas that can be used for all kind of applications. And the best, never pay one.... -
This DIY 12V to 220V voltage converter is build with CMOS 4047 that is the main component of this small voltage converter that transforms a 12V DC into 220V AC. 4047 is used as a astable mutivibrator, at pins 10 and 11 will have a symmetrical rectangular.... -
The circuit was deliberately designed using no ICs and in a rather old-fashioned manner in order to obtain good harmonic distortion behavior and to avoid hard to find components. The amplifier(s) can be conveniently supplied by a 12V wall plug-in adapter..... -
Frequency meter can be used in speed sensor, tachometer, or any measurement of repetitive signals. This frequency to voltage converter (FVC) can be used to turn... -
AN7415 based FM stereo demodulator circuit. 1.6 to 7V operating voltage range. High gain and low distortion.... -
The following circuit shows about TDA1524 IC Stereo Preamplifier Circuit Diagram. Features: used for controlling the (volume, balance, bass and .... -
8 ohm output for connecting communication receivers and 8 ohm speaker or low impedance phones, harmful interference suppression continuous random voice transmission. Passband 3.. -
This circuit not only indicates the amount of water present in the overhead tank but also gives an alarm when the tank is full. The circuit uses the widely available CD4066, bilateral switch CMOS IC to indicate the water level through LEDs. When the water.... -
The circuit devised by Phil Allison still has some input voltage limitations, since it is based on a FET. Junction FET VCAs also create considerable distortion, with the worst of it appearing when the signal is attenuated by 6dB. The common way to fix this.... -
Normally analogue-to-digital con-verter (ADC) needs interfacing through a chip to catechumen alternation abstracts into agenda format. This requires accouterments and all-important software, consistent in added complication and appropriately the absolute.... -
On many cars, the boot light will not go out until the lid is properly closed. It is all too easy when unloading the car, to leave the lid ajar. If you are unlucky and the car remains unused for some time, the next time you try to start it, the lamp will.... -
The 555 can be almost any type, they are all pin-compatible. Although some CMOS types may not have enough power to drive the transistor, in that case use an ordinary 555. C1`s working voltage should be increased to 25V if you decide to go with a 12V power.... -
The RS232 transceiver supports both RS232 and EIA-562 standards, whereas the RS485 transceiver supports both RS485 and RS422 standards. The logic input (MODE) selects between RS232 and RS485 modes. With three additional control logic inputs (RXEN, DXEN....
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This is a charger circuit for both NiCd and NiMh Batteries. Some time ago I aquired an old commercial handheld-TRX which was powered by a 12 Volt NiCd-Battery pack (10 Button Cells each having a capacity of 280mAh). In fact this (at least 10 year) old....
