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Circuits designed by David Johnson, P.E.
Last Updated on: Tuesday, October 24, 2017 03:04 PM

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

Clock Circuits

Circuits Designed by Dave Johnson, P.E. :

Digital Counter using Pedometer

Divide a TTL Clock Signal by 1.6

Divide By 1.5 Counter

Garage Door Timer

Laser Used as Vehicular Traffic Counter

Line Powered 60hz Clock Generator

Long Period Computer Watch Dog Timer

Motorized Duck Decoy Timer

On/Off Flip/Flop Circuit with Automatic Timeout

On/off Pushbutton Switch with 30 Minute Timeout

Poor Man's Timer

Pushbutton Activates Service Request Beeper

PWM Motor Controller uses a 555 Timer


Service Request Beeper

Solar Powered Quartz Clock

Three-Minute Closet Light

Timer for Darkroom Camera Shutter

Watchdog Timer set for 36 Hrs

12v DC Motor with Logic Controlled Automatic Brake

3 Minute LED Closet Light

36-Hour Watchdog Timer

3-Minute Closet Light #2

555 Timer Forms Simple PWM Motor Controller

60hz Clock Generator is Line Powered

Camera Shutter Time Measurement

Chicken Coop Door Opener with Timer

Closet Light with Automatic 3-Minute Timeout

Computer, Long Period, Watch Dog Timer

Count Cars with Laser

Darkroom Camera Shutter Timer


Dave's Circuits

Hobby Circuits

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



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

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