Self Latching

Parts List:
   R1 = 5K6
D1,D2 = 1N4001
   Q1 = 2N3904
   Ry = Relay, 12V
   S1 = Momentary break (normally closed) 
This relay driver is Self-Latching which means that once it activates it will remain in that state until S1 is pressed and momentarily disrupts power to the latch.

The rest of the circuit is the same as in Booster Relay Driver.

Copyright © 2003 - Tony van Roon