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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!




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

Infrared Safety Switch

Isolated Remote Switch Circuit

Light/Dark 12V Switch

Light/Dark Activated Motion Detector

Microphone On/Off Switch Circuit is Pop Free

Momentary Operation Touch Switch

Momentary Touch Activated Switch

Monitor ON/OFF status of a Remote Switch

Motion Alarm using piezo Device

On/Off Latch Circuit

On/off Pushbutton Switch with 30 Minute Timeout

On/Off Switch with Latching Relay

Piezoelectric Tap Switch

Piezoelectric Triggered Switch

Piezoelectric Vibration Sensor Activates Switch

Pop Free Microphone On/Off Switch Circuit

Protects from Battery Polarity Reversal

Pushbutton Activates Service Request Beeper

Pushbutton Oneshot & Latch

Pushbutton On-Off Latch Circuit

Pushbutton Switch Through Glass 

Pushbutton Switch works 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

Sink to Source Universal DC Converter

Small Pushbutton Controls 10 Amps AC

Solid State Touch Activated Switch

Switch activated by Piezo Vibration

Switch Detects Audio Signal

Switches AC or DC power using a Latching Relay

Tap Switch uses a Piezo Wafer

Through Glass Push Button Switch

Touch Switch 240VAC

Touch Switch controls a 120 VAC load

Touch Switch Exciter

Transistor-Switch Detects Audio Signal

Universal DC Sink to Source Converter

Water Seepage Monitor

 

1.5V Touch Activated Switch

120 VAC Touch Switch

12v Lamp Current Indicator

12v Light/Dark Lamp Switch

12v Touch Switch Exciter Circuit

12v Touch Switch Exciter Circuit

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

24 Volt Day Night Switch

240VAC Touch Switch

24v NiMH
Battery Charger using a 12v Solar Panel 

3-Minute Closet Light #2

3v Capacitance Proximity Switch

5 Volt Momentary Operation Touch Switch

5v Capacitance Touch Activated Momentary Switch

5v Touch Switch

5w Fluorescent Lamp Intensity Modulator

6V to 24V DC Day/Night Switch

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

AC/DC relay from Charge Coupled MOSFET

Band Drummerís Microphone Switch

Basement Remote Doorbell

Capacitance-Based Touch Switch

Capacitance Proximity Switch-3 volts

Capacitance Touch Activated Momentary Switch-5v

Capacitance Touch Switch

Car Ignition 12v Switch

Circuit Protects from Battery Polarity Reversal

Closet Light with Automatic 3-Minute Timeout

Day/Night Switch-24vAC Powered

Detector/Switch for Audio Signal

Detects Shadow Activated Motion

Finger Touch Activated Switch

High Power Touch Switch Exciter Circuit

Infrared Reflected Light Switch


 

Hobby Circuits by Category

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

 

 


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



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