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Small Pushbutton Controls 10
amps AC The circuit below uses a pair
of long lasting lithium coil cell batteries to power a latching relay circuit. With each
activation of the small pushbutton, the relay is either latched closed or unlatched open.
Since coin cells can’t provide the necessary peak current, a 500uF capacitor is used to store
the needed energy. The circuit standby current is kept very low by using a stack of five
100uF ceramic capacitors instead of the usual electrolytic cap. An aluminum capacitor,
even a tantalum capacitor leaks too much current, shortening the battery life. By using
the ceramic caps, the overall standby current is only a few microamps......
Jan 8, 2012
On/off Pushbutton Switch with 30 Minute
Timeout I received an email from a
Discover Circuits visitor. He wanted to control power to a LED camping light he was
building. He wanted to turn the light on and off with a small pushbutton switch.
He also wanted a timer so the light would not stay on longer than 30 minutes at a time.
It seems that his kids often turned lights on when going to bed and then forgot to turn them
off.....
