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'[piclist] Telephone monitor'
Harold M Hallikainen
|Yes, but it would not be legal. By the way, the circuit I posted was NOT
a phone line monitor, it was just an example of analyzing circuits with
op amps. The old 68.312(b)(1) required the on hook DC resistance to be
at least 5M. It'd have to be a pretty low current LED!
Note that the FCC has removed the interconnection standards from part 68
of the rules, turning them over to a private standards group. However, I
expect the on hook DC resistance requirement remains about the same. You
can see the old FCC rule at
with links to other rules, or
without links. In both cases, watch for URL wrap!
On Thu, 1 Aug 2002 13:12:04 -0400 "hog" <bellsouth.net> writes: lmoffitt
> Harold, wouldnt a resistor , twelve volt zener and led be
> cheaper-----when led lit fone is hung up??????? Lloyd
FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com
Reach broadcasters, engineers, manufacturers, compliance labs, and
Advertise at http://www.hallikainen.com/FccRules/ .
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