A simple Push ON/Push Off Control Circuit
by Mike Callaghan, KIIS, Los Angeles
This circuit was designed at the request of Carl Hanson at KNX-FM.
(If you don't like my hand-drawn schematic, then click on it !!)
This circuit was submitted to and became the National First Prize Winner for Broadcast Management and Engineering Magazine's 'Great Idea Contest" for 1987..
Here's How it works:
When power is first applied to the circuit, the parallel
combination of C1/R2 is charged to 1/2 VCC through the voltage divider R1/R2.
So, it provides a toggling 'Push-On / Push-Off' action using two resistors, a capacitor, and a relay. And because of the simplicity, it's virtually foolproof...
Our thanks to Mike Callaghan for sharing this with us.