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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, June 01, 2021 03:22 PM

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Capacitance Touch Switch Circuits
Circuits designed by David Johnson, P.E. :

Capacitance Touch Switch

Capacitance-Based Touch Switch

Detector for Human Footsteps

Exciter Circuit-12v Touch Switch

Knocking rings Doorbell

Momentary Touch Activated Switch

Reflected Infrared Light Switch

Single Output 120VAC 200 Watt Touch Switch

Solid State Touch Activated Switch

Touch Alarm for Door Knob

Touch Switch 240VAC

Touch Switch controls a 120 VAC load

Touch Switch Exciter


24v NiMH Battery Charger using a 12v Solar Panel 

5v Touch Switch

AC to DC (240v to 5v)Power Supply

Basement Remote Doorbell

Capacitance Proximity Switch-3 volts

Capacitance Touch Activated Momentary Switch-5v


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Dave's Circuits

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Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.