Time Relay 24V with Z-diode

193

03:09:39

A simple circuit for a time relay.  A zener diode is connected in reverse bias to the base of a transistor. The exponentially increasing charge voltage of a capacitor exceeds the Z voltage and the base quickly becomes negatively biased, which opens the transistor and lets the relay pick up. 

……play with the circuit. Push reset button to start circuit again! 

published 3 years ago

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