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Last Updated on: Thursday, November 30, 2017 07:43 AM

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Touch Activated Battery Powered Latching Relay
Designed by David Johnson September 12, 2011

A client needed a touch activated switch.  The unit needed to be fairly small and wired into the underside of some kitchen cabinets.  When touched, a string of fluorescent or LED lights, mounted under the cabinets, would turn on.  The total light power is less than 100 watts.

The system into two parts.  (1) A relay is mounted inside a plastic junction box and (2) a touch switch module.    Four wires leading from plastic junction box would connect to a second box containing the touch switch module.  The circuit is a simple relay driver powered by a9v battery.

Touch Control System Serpac SR221 Box

The complete circuit is shown below.

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DC Magazine, November 2011, Page 7:  Touch Activated Battery Powered Latching Relay


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