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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!

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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

Secret_Panic_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

Touch_Activated_Battery_Powered_Latching_Relay

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 Drummer’s 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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