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Featured Circuit of the Week

Remote Relay Driver   I received a call from a Discover Circuits visitor who wanted a simple way to turn on an outside lighting system using a low voltage control line.  I suggested the simple circuit below.  The circuit is powered by a 9v battery and uses a very efficient latching relay.  Two low voltage wires lead from the a toggle switch to the remote relay.  A toggle switch selects either the on or off condition of the relay.  The relay contacts are rated at 10 amps, so the small relay can handle a sizeable amount of power....

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The DiscoverCircuit Forum will  be removed
I regret any inconvenience its removal may cause.  On the morning of December 16, 2013
member(s) from China dumped over 200 pages of inappropriate material
into the forum.  This is not the first time.  In the past I was able to
remove the offending material and ban the member.  I will terminate the forum soon.

Hot Links to Check Out!

Faraday Switches are tiny one inch cube electronic modules using a capacitance change technique.  They draw very low current and are ideal for battery powered applications. 
Hobby Corner  has hobby circuits -- check it out. 
Circuit Solutions Dave Johnson shares solutions to tricky electronic design problems.
Dave's Circuits Special section with circuits designed by David A. Johnson, P.E.
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David A. Johnson, P.E. is an electronics engineer with over 30 years
practical experience  in the areas of analog & digital design, fiber optics
and RFID.  Electronics is his vocation, hobby and passion. 
He is a published author with articles and designs in EDN, Electric Design, and Popular Electronics.   Throughout his career, Dave's imaginative approach to design has resulted in applying new technologies  in creative and cost saving ways. 

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