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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, October 24, 2017 03:04 PM

List of Dave's Circuit Designs

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

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

Piezoelectric Tap Switch

Piezoelectric Triggered Switch

Pushbutton Switch Through Glass 

Pushbutton Switch works through Glass

Reduced Power Relay Driver

Relay Driver with Reduced Power

Remote Relay Driver

Small Pushbutton Controls 10 Amps AC

Solid State Relay Requires Only 50ua Drive Current

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

Thermocouple Temperature Activates Relay

Through Glass Push Button Switch

Ultra Low Power Latching Relay Circuit

Universal Flasher using a Latching Relay

Water Filling Station Controller


50ua Current Drives Solid State Relay Requires Only

Bidirectional Solid State Relay

Charging a 24v Battery Charger from a 12v Source

Computer Controlled Power Relay

Dusk To Dawn Latching Relay

Finger Tap Piezo Relay

High Temperature Thermocouple activates Relay

High-speed 75MHz light receiver


Light Receiver Works from 1Khz to Over 70Mhz

Low Voltage Latching Relay Driver

On/Off Switch with Latching Relay


Hobby Circuits by Category

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



Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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