Power OFF Delay Circuits

The LM4992 stereo audio power amplifier can be utilized to design a straightforward audio power amplifier project suitable for portable electronic devices. This amplifier circuit is capable of delivering 1 watt of continuous average power per channel to an...

A repertory dialer phone contains a library of phone numbers that can be entered and dialed, allowing access to up to fifteen frequently used numbers. It also includes the capability to store the last dialed number or an additional...

This is a Tesla/joule thief hybrid circuit that its inventor claims can produce 90 times the input power. The circuit can be self-looped and can provide 1050W of power, with only 11.6W looping back to supply the joule thief....

Easy to build, this high voltage generator is capable of generating up to 50KV but the breakdown voltage of the coil limits the voltage to a value somewhat lower. T2 is the ignition coil of a car and also...

Opamps are very useful. But one of their major drawbacks is the requirement of a dual supply. This seriously limits their applications in fields where a dual supply is not affordable or not practicable. This circuit solves the problem...

The telephone repeater is a circuit designed to amplify the call signal, making it louder than the original. This circuit has been developed in response to specific requests. The telephone repeater circuit functions by receiving the incoming audio signal from...