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RF transmitters :  Reconn's World Forum


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rc switch
Posted by: andrew ()
Date: June 26, 2003 09:56PM



Additional Notes
A simple and effective receiver for actuating garage doors, starter motors, alarms, warning systems and numerous other possibillities. The SCR, which has a very low trigger current of 30 uA is typical -- it requires an input power of only 30 uW to activate the relay. A high Q tuned antenna circuit assures rejection of spurious signals. A whip or wire antenna is adequate up to 100 feet from a low power transistor transmittor. A momentary-off switch resets the circuit.
The circuit specifies a whip or wire antenna which just means a solid piece of wire 6-12 inches long (15-30cm). The antenna coil is experimental but you can start with 10 to 12 turns of #22 (0.7mm) magnet wire, and 5/16" (8mm) coil diameter. Antenna wire is soldered at 1/2 turn of the coil and the gate of the BRY35 is soldered about halfway the coil. This circuit will transmit up to 100-feet with the above specifications @ 30uA.

NOTE FROM ADMIN:: I dunno if this will work.. looks simple... a little.. TOO simple.. but who knows.. respond to this if you get it to work..

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Re: rc switch
Posted by: nomadsworld ()
Date: December 30, 2005 04:10PM

Hmm, what does the trace connect to in the lower right corner of the diagram?

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