[sdiy] Roland DCOs

[Ingo Debus]

Am 25.02.2008 um 11:53 schrieb Tom Wiltshire:

>
> What I wanted to know is if anyone has built a DCO along these  
> lines, and what they discovered. I've wondered about doing it  
> myself since the 82C54 triple counter chips are only a few pounds

AARGH! The nastiest chip I ever came across!!


> and the subsequent circuitry is also pretty simple. Alternatively,  
> you could use the counters on a PIC or similar.

Yes, that's a far better solution. You'd need a processor to control  
the 82C54 (the C stands for crap) anyway, and the '54 would require a  
lot of port pins. Perhaps this processor can also generate the  
voltage that is required for constant output amplitude?

Ingo