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.


DiscoverCircuits.com -- Hobby Corner
Last Updated on: Monday, October 09, 2017 03:35 PM

Hobby Circuits' Circuit List

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server

More  Driver Circuits, Switches, Latching Circuits, Relays


The circuit below switches AC or DC power to a load using an ultra low power 3v latching relay with two coils.  The relay can handle about 10 Amps of current, up to 250vac.  Each time the small pushbutton is pressed, the circuit either latches the relay contacts closed or unlatch them open.  The 3v powered circuit uses a single 74HC14. This device contains six Schmitt trigger inverters in the one 14 pin package.  Two inverters form a flip/flop circuit.  Each time the pushbutton is pressed, the circuit changes state and stays in that state until the button is pressed again.  With each state change, a 25ms latching or unlatching pulse is produced and is routed to the correct relay coil.  The coil resistance is about 45 ohms so about 70ma of current is drawn from the 3v battery for each relay pulse.  The average power is so low that the circuit can operate for many years on one set of batteries.  I would suggest using two AA or AAA alkaline cells.

Click on Drawing Below to view PDF version of Schematic

On/Off Switch with Latching Relay designed by Dave Johnson, P.E.

More  Driver Circuits, Switches, Latching Circuits, Relays

Hobby Circuits' Circuit List
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.