[sdiy] Last chance for 4xD PCB order
Seb Francis
seb at burnit.co.uk
Fri Jul 21 12:08:55 CEST 2006
>
> Each CV input is fed to both one dsPIC ADC (for direct, high
> speed control of the delay time) and one UI PIC ADC (for delay
> time display).
>
>
Ah, I understand. And contrary to what I said before you can freely use
the on-board CV input buffer circuit in any way you wish - including
routing a single CV input to PIC&dsPIC (just make a link from
P1/P2/P3/P4 to the appropriate input points). So no external buffering
will be necessary - just make sure you use rail-to-rail input opamps
(OPA2340 is better than AD823) for U8 & U12 to get the full 0-5V CV range.
>
> Well, no, I'll follow your suggestion of controlling the actual
> delay time without going through the UI PIC. The CV fed to the
> UI PIC will only be there for display. It will have no influence
> on the dsPIC. And should that mean losing the software LFOs,
> I'll happily sacrifice them on the altar of VC.
>
I can see no reason why you can't keep the software LFOs as well as VC
if you wish (the software LFOs are implemented in the dsPICs and just
have their parameters set from the UI PIC - the varying delay time is
not displayed as the LFO varies).
>
>
>> P.S. The promiscuous, scantily-dressed girls I'm afraid you
>> will have to arrange for yourself ;)
>>
>
> So that's the catch !
>
>
Maybe will be available in a future software update ;)
Seb
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