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

DiscoverCircuits.com has links to 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.

HOME Schematics Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches
Welcome to DiscoverCircuits.com - online since 2002

See Media Kit for
Advertising Opportunities

Attention Designers:  Please alert us by eMail if we have linked to sites
where your original material has been copied without your permission.
We will change to the LINK to your site.  
Thank you.


Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, October 18, 2017 05:04 AM

Master Category List - Dave's Circuits

Text & Graphics Copyright David A. Johnson, PEALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to your WEB SITE server!

More Timer Circuits

Chicken Coop Door Opener with Timer
March 18, 2013

I received an email from a guy in Australia who was trying to build a chicken coop system.  He was planning on using a conventional garage door mechanism to open and close the 6 doors to the coop.  The commercial door opener opened and closed the doors with a single pushbutton.  He wanted to install a standard 220vac powered timer so he could open the doors in the morning and close them at night.  He was not sure how to perform this function.  I suggested the circuit shown below. 

It uses an off-the-shelf AC to DC power adapter, a pulse generator circuit and a reed relay.  The relay contacts are wired in parallel with the door opener pushbutton.  Every time the timer turns on the power adapter, the relay would activate for about a second or two.  When the timer turns off, the capacitor C1 is discharged.  I suggested a 12v power adapter and a reed relay with a 1K coil resistance.  For 120vac systems, a 120vac timer and a 120vac powered adapter would be needed.

Click on Drawing Below to view PDF version of Schematic

More Timer Circuits

List of Dave's Circuit Designs
eMail David A. Johnson, P.E. about this circuit



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

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |   
Privacy Policy

Discovercircuits.com endeavors to credit original designers.   Please alert us by eMail so we can
delete links to material that have been copied without your permission
.   Thank you.

Copyright of all original material on this website is the property
of David A. Johnson, P.E. (Dave Johnson & Associates ) unless otherwise noted.  

Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.
All material is provided "as is" without guarantees or warranty of any kind, either expressed or implied.