Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
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Hobby Circuits designed by Dave Johnson

Last Updated on: Saturday, December 30, 2017 05:01 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. :

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

 



HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
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Copyright  January, 1998 - December, 2017     David A. Johnson & Associates.  All Rights reserved. 


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