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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!

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


Pushbutton Switch Through Glass

Relay Driver with Reduced Power

Solid State Relay that is Bidirectional

Solid State Touch Activated Switch

SSR Requires Ultra Low Control Current

Super Capacitor makes Low Voltage Latching Relay Driver

Switches AC or DC power using a Latching Relay

Tap Switch uses a Piezo Wafer



Universal Flasher using a Latching Relay

Water Filling Station Controller


50ua Current Drives Solid State Relay Requires Only

Computer Controlled Power Relay

Finger Tap Piezo Relay

High Temperature Thermocouple activates Relay


Hobby Circuits by Category

Dave's Circuits

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


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