Circuit - Touch Switch Circuits Page 2 / Schematics List - Circuits designed by David A. Johnson, P.E.

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Faraday Touch Switches

Touch Switch Circuits, Page 2
Designed by David A. Johnson, P.E.
Last Updated on: Tuesday, October 13, 2009 01:27 PM

Master Category List - Dave's Circuits

Dave's Touch Switches: Page 1, Page 2, Page 3

120VAC Touch Switch
This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load.

240VAC Touch Switch
This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load.

3V CAPACITANCE PROXIMITY SWITCH
This circuit was designed to provide a touch activated switch function without an external power supply. It draws so little power that a single 3v battery will operate the circuit for many years. It is discussed in more detail in the section on Capacitance Proximity Switch Technology. (Note link is off site)

5 VOLT MOMENTARY OPERATION TOUCH SWITCH
This simple circuit uses a single IC to form a nice touch switch circuit. A single transistor forms the remote active switch sensor. Multiple switches can be wired in parallel. The switch circuit can be located about 500 feet from the control circuit.