--001636e0ad73174ef4048140714f Content-Type: text/plain; charset=ISO-8859-1 > I'd just use a VCO made with op-amps. ... That's what I had in mind when I asked about frequency etc. The attached circuit is copied from an LM324 data sheet. (Page 13 here http://www.national.com/ds/LM/LM124.pdf ) LM324 is getting rather tired at 3 Volts but some other opamps would do better. Parts count is far higher than using a more dedicated IC but cost could be good and footprint is probably OK. 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