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Touch Switch Circuits, Page 1
Designed by David A. Johnson, P.E.
Last Updated on:
Tuesday, October 13, 2009 01:26 PM
Master Category List - Dave's Circuits
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Dave's Touch Switches:
Page 1,
Page 2,
Page 3 |
- 1.5V TOUCH ACTIVATED
SWITCH)
A single 1.5v silver oxide button cell powers this complete touch activated
switch circuit for 5 years. It features both a normally open and a
normally closed set of solid state switch thermals. It also has an
adjustable sensitivity, which can be set for a touch capacitance change as small
as 1 picofarad.
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- 5V CAPACITANCE TOUCH
ACTIVATED MOMENTARY SWITCH
This circuit is discussed in more detail in the section on Capacitance Proximity
Switch Technology. The circuit is powered from a standard +5v supply. It has
both a source and sink output that change state whenever a metal button
connected to the circuit is touched. An earth ground reference is required.
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- 12V TOUCH SWITCH EXCITER
CIRCUIT
This circuit is designed to generate a 20KHz pseudo sine wave signal that can
power about 50 remote touch activated switch circuits. It can support a
cable length of about 2500 feet. A typical remote switch circuit is also
shown as well as a receiver circuit for those switches.
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| Dave's Touch Switches:
Page 1, Page 2,
Page 3 |
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More Touch Switch
Circuits
Master Category List - Dave's Circuits
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