1 Mar
2008
1 Mar
'08
8:51 p.m.
"Roy J. Tellason" wrote:
I do indeed have a board around here someplace that I
have no info on, but
it's got a row of those -- 12? -- and the outputs of them seem to be coupled
to a couple of 7400 chips.
..early DTMF decoder perhaps? (although the count should be 7 or 8 for DTMF).
Alternatively, some proprietary radio signalling/control stuff used multiple tones.