G'day Tony, 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. -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Sugar-devel mailing list Sugar-devel@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/sugar-devel
