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The circuit is designed to operate with an audio power amplifier that uses 18V-0V-18V power rails. The specific voltage is not critical, but the feedback is referenced to an LED chain connected to a 12V rail, necessitating a separate...
A lithium-ion battery charging circuit is illustrated above. Initially, when charging begins, if the battery voltage is below 8.4V, the output of IC1 is inactive. As a result, Q2 remains off, and the LM317 operates in constant current mode....
This is a Variable Voltage Regulator Circuit built using the LM317T integrated circuit (IC). The LM317T is an adjustable three-terminal positive voltage regulator capable of supplying more than 1.5 amps over an output range of 1.25 to 37 volts....
Nowadays electronic voting machines are being used effectively. The confidence of the voter in its flawless working is gradually building up and these machines are thus becoming quite popular throughout the country. Features of the electronic voting machine include...
Project Manager Jim Heck, G3WGM, has provided an exclusive audio interview to Bob McCreadie, G0FGX, from TX Factor, detailing the tests and potential issues involved. Membership in AMSAT-UK is available to anyone interested in amateur radio satellites or space...
A simple circuit is required to simulate sensor inputs to a PLC. The sensors operate at 12VDC and output a current of 4-20mA. The XTR series devices are being considered for this application, but clarification is needed regarding which...
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