-------- Ulf Kylenfall via time-nuts writes: > I checked the A1 syntesizer unit which did > provide correct output frequencies but > they were not as stable [...]
> I have two of these synthesizers, but they are > both the 1st edition using TO packaged > IC's that are unobtanium. One of my manuals > shows a more modern unit with plastic DIP's. > Some signetics and a one-shot that is unidentifiable. I had one of those one-shot's become unstable. I replaced the entire digital divider-chain with the PWM peripheral in a LPC810 8-pin DIP ARM chip. Pretty much any microcontroller with a decent PWM can do the job, which is to output a 10µs pulse evern N cycles of a 5MHz clock signal. I hardcoded the divisor ratio, but one wants to, 16 GPIOs on the microcontroller could read BCD thumbwheels. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
