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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!

Multi-Vibrator Circuits
Circuits designed by David Johnson, P.E. :

Capacitance Touch Switch

Flashing LED Advertising Badge #1

Generate Short Delayed Pulse

H Bridge Motor Controller uses Low Power

It's Time to Dust Indicator

Miniature Pushbutton On/Off Switch

Momentary Touch Activated Switch

Oneshot & Latch Pushbutton

Slotted Opto-Sensor used in Honeybee Counter

Time to Dust

Timer for Darkroom Camera Shutter

Turn D-Flip/Flop into a One Shot Circuit

Two-Transistor Low Power Oscillators

1 Second One Shot Circuit

Astable Ultra Low Power Multivibrator

Automatic Timeout included with this On/Off Flip/flop Circuit

Battery-Powered LED Flashing Advertising #2


Hobby Circuits by Category

Dave's Circuits

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


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