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Hobby Circuits designed by Dave Johnson

Last Updated on: Thursday, November 23, 2017 04:57 AM


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 David 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

Quartz_Clock_Solar_Powered

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


 

Hobby Circuits by Category

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Copyright  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.