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Last Updated on: Friday, November 17, 2017 06:32 AM

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More  Relay Circuits, Switches

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 canít 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.

The circuit uses two Schmitt trigger inverters from Toshiba.  The two inverters are configured in an alternating latching circuit.  With each activation of the pushbutton switch, the circuit either latches or unlatches the dual coil latching relay from Panasonic. The relay is quite efficient, only requiring a 25ms pulse to either latch the 10 Amp contacts open or close.  The batteries should last at least 5 years.

Ceramic 1206 100uF Capacitor 5v Coil, 10 Amp Contacts, Latching Relay

Click on Drawing Below to view PDF version of Schematic

Pushbutton Activated 10A RelayDO NOT COPY

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