Top Circuits Page 134
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This scheme is for 4 cylinder motor. This will make your car spent less fuel, be a little bit faster and you wont have to frequently open your distributor cap to change the contact buttons thus wasting less money. T1/T2 create one monostable multivibrator in....
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This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The....
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One of the drawbacks for some of us is that Linux support for PICs is not very well known. The information is out there, but no one has laid out the process of going from writing C code to programming a chip. Written for Linux users that are familiar with....
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Here is simple sound sensor schematic, it`s use only one IC and and two transistor to drive the relay. this schematics can change the sensitivity using VR resistor also. I think this schematics is very usefull and can build anyone...
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There are situations in home automation applications where you would like to measure the level of some body of water (e. g. pool, pond). The 1-Wire network makes it easy to interface sensors to a PC or simple controller. Some experimenters use a string of....
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This is how I designed a simple circuit that allows you to control a servo and put it through its paces....
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Vacuum tubes represent an electronic technology whose roots extend a century and more into the past. With the exception of their continued use in certain niche applications, they have all but vanished from contemporary electronics, having been replaced by an....
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We decided to design and build a robot capable of vacuuming the floor of a room or area without any human interaction other than just starting the unit. We realized the need for a cheap and convenient product that can be easily used to vacuum a room on its....
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In the example above a low voltage (12Vdc) is used to turn on a relay to switch on a 240V ac main circuit. Please note that there is no electrical connection inside the relay between the two circuits, the link is only magnetic and mechanical. If there is....
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On your circuit 5v was the most common voltage for electronic components, everything was 5v, and a lot still is now. USB is still a 5v protocol, and many microcontrollers are still 5v. As electronics have become more efficient and smaller however, their....
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8 solid-state-relay (SSR) and ADAM-4068 (Serial-I/O device) and ask me to wire a circuit to control a motor for his robot. ADAM-6048 is a handy device that let you control digital input and output via RS-485, serial communication given a protocol in its....
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Build circuit on a 1" square circuit board. Position the variable resister so that it can be adjusted from one of the edges. Attach the CdS cells at the other end but not at the edge. Drill out two pins next to the center of one of the long sides of a Lego....
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This flip-flop circuit is a free running/astable multivibrator one, with bases and collector of both emitter biased transistor are directly coupled to each other. Switching action is supported by means of capacitor in each emitter circuit. This configuration....
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This inverter circuit can be used to power electric razors, stroboscopes and flash tubes, and small fluorescent lamps from a 12 volt car battery. In contrast to the usual feedback oscillator type of inverter, the oscillator of this inverter is separate from....
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C1 and C2 with a speed controller works by receiving the voltage at the gate of the MOSFET when the voltage on C turn ON the other would be to drive MOSFET operation...
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Here is the mini FM transmitter circuit using 2 transistor. Audio sensitivity is very good when used with an ECM type microphone insert. This smallFM transmitteruses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the....
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The wide-range current pump for the precision phase locked loop circuit is a semiprecision circuit, and provides an output current proportional to -V1, give or take 10 or 15%, over a 3-decade range. The 22 MW resistors prevent the current from shutting off....
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A frequency-selective frequency multiplier can be construct with a PLL system by inserting frequency divider inside the feedback between the phase detector input and the VCO output. Figure below shows the schematic diagram of low-frequency synthesizer with a....
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A sequential timer circuit device are used in many applications for initializing conditions during start-up or for activation of test signals in sequences such in test equipment device. The circuit diagram below shows a sequencer circuit with possible....
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The reverse unit project schematic design uses semiconductors such radial polarized capacitor, 2N2907 PNP General Purpose Amplifier, N-Channel MOSFET with Schotky diode protection, 2N2222 NPN General Purpose Amplifier, LM7805 Voltage Regulator...
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
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The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website since 1999 and built by a lot of hobbyists. Unfortunately, that circuit stops operating when the battery voltage falls....
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The whole project was developed on a friend`s request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. Mains requirements were: The very....
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The series of UC 3842, 3843, 3844 and 3845 Oscillators can be used to generate sync pulses which no need to have a lot of external components. As seen in the following circuit, it shows Sync Pulse Generator Circuit Diagram of the UC3842/3/4/5. This sync....
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BA5417 is a stereo amplifier IC with a lot of good features like thermal shut down, standby function, soft clipping, wide operating voltage range etc. The IC can deliver 5W per channel into 4 ohm loud speakers at 12V DC supply voltage. The BA5417 has....
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A low ripple regulated DC power supply designed based on transistors is shown here. Such transistor voltage regulators are suitable for application where high output current is required. Conventional integrated series regulators like 7805 can only deliver up....
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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....
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This circuit will be particularly useful to those hobbyists who use a breadboard` to try out ideas and who also use a simple home-made` DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over....
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While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge current through the speaker at the time of power on. This current may damage the speaker, especially in case of direct coupled amplifier...
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Infrared light reflected off a finger is used to activate this switch circuit. Drawing only 30uA from a 3v supply, this circuit will detect a human finger with a range of about 1 inch. The sensor uses an inexpensive infrared LED and a matching photo diode...
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The frequency meter can be used to measure the frequency of 10 Hz-60Mhz. The frequency meter has a level of precision or resolution of 10Hz. The frequency meter can be used to measure the frequency of the oscillator, transmitter, frequency generator,....
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IC H Bridge DC motor driver L298 has two H-Bridge circuit in it, so it can be used to download the drive two DC motors. H Bridge DC motor driver L298 each can deliver currents up to 2A. However, in use, the H Bridge DC motor driver L298 can be used in....
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The series of decibel meter function to determine the level of signal strength that is given to the speaker on the audio system. Decibel meter circuit is often also known as the VU meters on audio hifi system. For a series of decibel meters in this article....
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IC LM2917 IC chip is designed specifically as a Frequency to Voltage Converter or Frequency to Voltage converter. In its use to applications Frequency to Voltage Converter IC LM2917 requires few external components. There are several examples of applications....
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Magnetic switch is a circuit which can respond to magnetic fields that were around the sensor. The series of magnetic switches uses sensors in the form of limit switches that provide an additional metal plate that can respond to a magnet. Magnetic switch....
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Volt meter and ampere meter with PIC can be used to measure voltage and current at the same time. The series of volt meter and ampere meter with PIC uses a PIC16F876A as a data processor voltage and current are measured. This circuit uses a LCD viewer 16 G—....
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Light Switch With Relay is a series of electronic switches that are controlled by a series of light received. Light Switch With Relay circuit can be used to control lighting automatically, so the lights can automatically turn on when the room light or the....
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Simple Timer With 555 is one example of a simple timer and can be applied to electronic equipment. With 555 Timer Simple series takes advantage of the mode of the IC monostable multivibrator 555. With the relay output control circuit can be used to control....
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USB Battery Charger For Lithium Ion battery with the LM3622 is a series of lithium ion battery charger. This charger circuit operates using power from the USB source computer. Current consumption of a series of with 400mA LM3622 is limited by R1, so it does....
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Gather statistic about the electricity usage at my new house, mainly to see how much using the fireplace lowers the bill. The meter installed by the utility company has a led that blinks at the speed that is relative to the usage. Text on the meter says that....
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This circuit produces oscillating frequency around 1kHz, and able to be converted by changing the value of resistor R1. The speaker will produce a long beep sound with 1kHz frequency. Here is the schematic :..
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The basic design of this project will use a Atmel AT89S8252-24PC Microcontroller, since this micro has 2KB of EEPROM that can be used to store data during runtime. A ADC0838CCN analog to digital will be used to receive up to 8 inputs from sensor devices,....
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The first resistor on the left in the schematic says 68k. This will vary depending the the microphone. In our case we used a microphone from digikey with a 1. 5k output impedance, so we matched it with a 1. 5k resistor instead of using a 68k...
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A few weeks ago, it came to my attention that IKEA do a set of colour-changeable LED strips. I ve been looking for a decent way of providing ....
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Improving the Canon 5D Mark II audio so that it can produce usable production audio. The first part of any engineering effort is data gathering, so I set about to measure the input frequency response of the 5D. My end goal was to use the Marantz PMD661 field....
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