Apple II over-current issue

ard at p850ug1.demon.co.uk (Tony Duell) writes: Not for PMR conversions, but custom-frequency oscillators are still useful for beacons, SDR receivers, and so on. A common approach these days is to use a programmable clock synthesiser chip, rather than a custom crystal; for example, SiLabs do a range of chips, some of which are factory-programmed to a single frequency (or pair/quad of frequencies with a selection input), and some of which can be adjusted at runtime using I2C: http://www.silabs.com/products/clocksoscillators/xo/ You could, for example, order a CMOS Si510 programmed to the frequency you're after. SiLabs apparently do free samples of some of the fixed-frequency chips... Alternatively, if you can find a cheap crystal for a frequency a bit higher than the one you want, you could try "penning" it down: http://www.hanssummers.com/penning.html -- Adam Sampson <ats at offog.org> <http://offog.org/>