Power-On Time Delay Relay circuit


Posted on Feb 7, 2014

Here`s a power-on time delay relay circuit that takes advantage of the emitter/base breakdown voltage of an ordinary bi-polar transistor. The reverse connected emitter/base junction of a 2N3904 transistor is used as an 8 volt zener diode which creates a higher turn-on voltage for the Darlington connected transistor pair..


Power-On Time Delay Relay circuit
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

"Hee-Haw" Electronic Siren
Build a Beeper visual indicator
pic16f688 based digital voltmeter
Phantom Powered Microphones
Low voltage DC motor speed control circuit
The EF50 the tube that helped to win the War
DTMF Proximity Detector
Clamp meter circuit
Four-way operation of the reverse brake circuit



Top