[Sugar-devel] Interesting USB-pluggable robots, controller boards, and sensors
quozl at laptop.org
Wed Mar 16 21:40:32 EDT 2011
The LM567 is a voltage controlled oscillator with phase detectors ...
and isn't often used these days, so it might be a challenge to find a
realistic price. Then you need one per detected frequency.
An alternative might be to use a DTMF decoder chip, such as the 8870,
since this provides more channels.
I've controlled amateur radio repeaters using an XO as the DTMF source,
even through the speakers.
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