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Hobby Circuits designed by Dave Johnson

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

List of Hobby Circuit Designs

Text & Graphics Copyright © David A. Johnson, PE  --  ALL Rights Reserved.
LINK to Dave's circuit, but DO NOT COPY CONTENT to your WEB SITE server!

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

Detector/Switch for Audio Signal

Microphone On/Off Switch Circuit is Pop Free

Momentary Touch Activated Switch

Monitor ON/OFF status of a Remote Switch

Protects from Battery Polarity Reversal

Pushbutton On-Off Latch Circuit

Pushbutton Switch Through Glass

Reflected Infrared Light Switch

Replace a Pushbutton Switch with this Infrared Safety Switch


Service Request Beeper

Single Output 120VAC 200 Watt Touch Switch

Solid State Touch Activated Switch

Switch activated by Piezo Vibration

Switches AC or DC power using a Latching Relay

Tap Switch uses a Piezo Wafer

Touch Switch 240VAC

Touch Switch controls a 120 VAC load

Touch Switch Exciter


Transistor-Switch Detects Audio Signal

Universal DC Sink to Source Converter

12v-24v AC & DC Day/Night Switch

24 Volt Day Night Switch

24v NiMH Battery Charger using a 12v Solar Panel 

5v Touch Switch

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

AC/DC relay from Charge Coupled MOSFET

Band Drummerís Microphone Switch

Basement Remote Doorbell

Capacitance Proximity Switch-3 volts

Capacitance Touch Activated Momentary Switch-5v

Capacitance Touch Switch

Capacitance-Based Touch Switch

Car Ignition 12v Switch


Hobby Circuits by Category

Dave's Circuits

eMail:  David A. Johnson, P.E. about these circuits


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Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
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