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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, June 01, 2021 03:22 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 David Johnson, P.E. :

Camera Shutter Time Measurement

Close Garage Door with Timer

Computer, Long Period, Watch Dog Timer

Count Cars with Laser

Digital Counter using Pedometer

Divide a TTL Clock Signal by 1.6

Poor Man's Timer

PWM Motor Controller uses a 555 Timer

Quartz_Clock_Solar_Powered

Service Request Beeper

Timer for Darkroom Camera Shutter

Watchdog Timer set for 36 Hrs

12v DC Motor with Logic Controlled Automatic Brake

3 Minute LED Closet Light

60hz Clock Generator is Line Powered


 

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Dave's Circuits

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

 



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Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.