> The question is, which frequency difference is really required to > prevent the locking.
The other tricky bit is that the "beat" frequency needs to be slow enough to be visible. At this point, I don't think I'm going to worry about it any more. I've redesigned the board to accept caps in either spot, so you can try both oscillators (different frequencies) at one time, or both of either type. Probing unlocks them, they're kinda fun to play with. Mine at the moment likes when I short the feedback line to ground with a 1k resistor; it pushes them out of sync and you can watch the two LEDs go from fast blinking to slow blinking to... stop. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user