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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.... -
The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1). The seven segment.... -
Using TEA5551T monolithic integrated radio circuit can be designed a AM radio receiver circuit which is designed for use as a portable radio receiver with headphones. The TEA5551T radio receiver circuit contains all is needed for a AM radio receiver circuit.... -
A 12V battery full charging circuit with simple diagram for rectifier is given.The lead acid trickle charger circuit is explained with a rectifier.... -
Combining armature resistance cancellation (via positive current feedback) with a motion-reversing H-bridge circuit topology offers a new twist in dc servo motor speed control.. -
NJM2268 is a dual Video 6dB Amplifier with 75 drivers for S-VHS VCRsHI-BAND VCRsetc. One channel has clamp function that fixes DC level of Video signal and another one is bias type. Furthermore it has 75 drivers to be connected to TV monitors directly and.... -
The following circuit is a Basic 555 squarewave oscillator. Feature : 1 Khz tone, Simple circuitry, limit = 200 mA, inductive voltage reduced, 4.5-9 Supply voltage. Component : 555 timer IC, resistor, capacitor, Speaker, 2N3053 transistor, push button... -
This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered. The.... -
The high-pressure direct current power supply has been already increasingly extensive. The method that this literary grace outputs in parallel with the power of double-channel gets the direct current of the low ripple. Today when the gas switching tube.... -
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detectmetal wiring if it conducting ac.... -
It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer. It is used in the astable mode. The 555 timer output will go high for an adjustable period of time and.... -
This 1 Hz and 2Hz generator or oscillator is built with 4060 as an oscillator and a 14 bits counter. To obtain a 1Hz signal after 4060 we use 1/2 4013. This circuit provides a rectangular voltage with a amplitude between 0V and the power supply voltage... -
This Adjustable Analog Timer circuit starts timing when switched on. A green LED lights to show that timing is in progress. When the time period is over the green LED turns off, a red LED turns on and a bleeper sounds. The time period is set by a variable.... -
An Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in principle, but the problem is that when the IR transmitters and.... -
The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the.... -
This simple circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the button once - will energize the relay. And pushing it a second time - will de-energize the relay..... -
The circuit in Figure 1a and Figure 1b are the schematics of an ultrasonic proximity detector. It has a maximum detection range of approximately 6 ft. When someone passes in front of the ultrasonic transceiver board, the contacts of relay K1 will close. The.... -
This UHF transmitter is designed for low power applications as remote for garage doors and operating systems, wireless alarm. This UHF FM transmitter with.... -
It is sometimes necessary for an RC (remote control) model to contain some kind of switching functionality. Some things that come to mind are lights on a model boat, or the folding away of the undercarriage of an aeroplane, etc. A standard solution employs a.... -
A simple electronic circuit project is discussed here that may be built by any school student for displaying in a school fair science exhibition. The proposed circuit is a high gain opamp amplifier which detects slightest of RF disturbance that might be.... -
Several years ago a colleague suggested that I should be using PICs for my hobby, which then was amateur television. I spent many hours developing and experimenting with video mixers, faders and effects (FX) units, and all this was done sing analogue and.... -
A circuit is described that transmits temperature data over an IR link. This allows isolation of the temperature sensor.... -
This 555 timer based circuit is a kind of voltmeter, also an analog to digital converter, that converts the analog input voltage to digital output pulses .. -
Small telephone bug. Listen telephone line on your FM receiver. It is self powered. Small part count. Circuit diagram, schematics, electronics project.... -
The loads (2 or more solenoids in parallel) share a 12V supply and are individually switched to ground through the car`s ECU. I need to detect when any one of the circuits close (only one closes at any one time), using a single PIC digital in (or comparator.... -
Dynamic flip-flops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to....
