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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......
Faraday Switchesare tiny one inch cube
electronic modules using a capacitance change technique. They draw very low
current and are ideal for battery powered applications.
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Dave
Johnson & Associates - consulting services for new products from conception to
production or improving the
cost & performance of existing products
David A. Johnson, P.E. is an
electronics engineer with over 30 years practical experience in
the areas of analog & digital design, fiber optics and RFID. Electronics is his
vocation, hobby and passion. He is a published author with articles and designs in
EDN, Electric Design, Midnight Engineering and Popular Electronics. Throughout
his career, Dave's imaginative approach to design has resulted in applying new
technologies in creative and cost saving ways.
