Is the NE567 chip still being made?
I thought about that when I recently built a quick and
dirty single-tone decoder and accidentally burned out a couple of
the ones I have in stock.
The NE567 is a 8-pin DIP which can be set to pull its
output pin low upon receipt of a tone whose frequency is set by a
RC pair. The lock time and amount of time that the tone has to
be present can also be controlled by a couple of capacitors that
set the output filter and the PLL's low-pass filter.
The main headaches with the 567's, like all PLL-type
devices are the problems with false triggering and front-end
overload which can make the device either trigger when it
shouldn't or loose lock when it should be triggered.
My two questions are: Is the NE567 still made? Is there
something better that is as easy to use in a cercuit that is also
in a DIP package?
There are a number of telephone tone type decoders around
that use SCF technology, but I am looking for decoders that can
be set to a whole range of frequencies depending upon what the
builder of the circuit wants.
P.S. I got my 567 working and have 3 left, but this made
me get to thinking.
Martin McCormick WB5AGZ Stillwater, OK
OSU Center for Computing and Information Services Network Operations Group
--
Author: Martin McCormick
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