2 modules ideas

[Paul Maddox]

HH,


> I think the owner of the "Modulus" pages has described a very
> HF VCO, as have several other list menbers... I seem to remember they were
> still capable above 200KHz. We would NOT care about waveform
> integrity... just a pulse would be OK.
>

yep, it'll goto a smidge over 1Mhz.. and gives just a pure square wave.

> You might try waveform multiplication using a sawtooth wave
> (like Grant Richter's "Waveform City") to get a high frequency
> clock...
>

yeah, you could use an ADC and use the LSB as a clock.

>
> The "top octave" comment is also good... but since the chips are mostly
> unobtainable today (and they are equally tempered) maybe we
> should use our own divider strings. THIS approach will toss the frequency
> well into the MHz...
>

you can do TOG chips with micros, not too difficult really..
But its not a very flexible approach.

>
> This is why (IMHO) few units have used additive sucessfully. The
programming
> is a real bitch !!!

this is the REAL problem.. for anything half decent you need at least 32
harmonics
and multi stage EGs for each, this soon becomes a complete nightmare!

Paul (not Hairy) Maddox