A friend is looking for a device to allow him to produce a single
"programmable" square wave output at any frequency from "KHz to 10's of
MHz". He wishes to be able to allow users to generate a stable frequency of
their choice,  probably (but not necessarily) using a 32 KHz reference
frequency.

I suggested PLLs and a frequency locked loop based on a PIC frequency
counter type core (as used by some radio amateurs). Neither of these seemed
to meet his cost/simplicity objectives. Politics makes a purpose built IC
rather than a microcontroller desirable.

How would YOU do this at lowest cost with "good" accuracy. A price of say
$US5 absolute max all up is desired. .




regards

            Russell McMahon