[BC] Wanted - Subaudible Tone Decoder Suggestions

[khcs@juno.com]

Bob S. replied:

>Seems to me that an old GE two-way radio tone module which
used the red "reed" module would do it and they can be picked 
up at a ham-fest for a couple bucks.  The "reed" is nothing more
than an RC circuit encapsulated in a small red plug-in module.

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That may not work as what he is looking for is probably 25 Hz.  I have put together tone decoders using a 741 opamp driving an NPN transistor which then pulls a relay to ground.  If someone has the time, it's not too hard to do.  


Glen Kippel
KHCS
Palm Desert, CA