Monthly Archives: June 2010

Voltage Multiplier

Posted on June 28, 2010 by Rend
VOLTAGE MULTIPLIER

This is a voltage multiplier circuit. First circuit is used to double the a square wave (any amplitude). However there is minus about 2v losses in base-emitter of the transistors and the diodes in first circuit. To work, second circuit … Continue reading →

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Fastest Quiz Bell/Alarm

Posted on June 25, 2010 by Rend
QUIZ TIMER

This is aquiz bell/alarm circuit. This circuit indicate “fastest finger first”. This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees … Continue reading →

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Small Amplifier Using Transistors

Posted on June 24, 2010 by Rust
Small Amplifier Using Transistors

The output of this circuit is push-pull and consumes less than 3mA (with no signal) but drives the earpiece to a very loud level when audio is detected. Because the whole circuit is Dc coupled, its extremely difficult to set … Continue reading →

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