[sdiy] frequency counter, DAC for demultiplexing

[cheater cheater]

Or as an ADC? No? ok..


On Sun, Oct 25, 2009 at 16:23, Ingo Debus <igg.debus at t-online.de> wrote:
>
> Am 25.10.2009 um 14:02 schrieb Tom Wiltshire:
>
>>>>
>>>>> A 8253/8254 counter chip can make minor wonders for you along with some
>>>>> processing. Found in several synths and at least one high end counter.
>>>>
>>>> Argh, why use such an ugly and outdated chip these days?
>>>
>>> Funny... I get almost the same feeling when someone wants to abuse audio
>>> DAC for multiple CV outputs ;)
>>
>> I wasn't trying to abuse it. I rather hoped it might work, as it would
>> have been a nice, simple solution. Unfortunately it didn't. (Hey, just add
>> it to the list...)
>>
>> I've been using the dsPIC Audio DAC for slow modulation for ages with good
>> results. You can get great envelopes and LFOs and random modulation sources
>> out of it, so it didn't seem too unlikely. It'll produce a infinitely-held
>> level ( e.g. outputs down to 0Hz) so it isn't *just* for audio.
>>
>> The trouble is not the fact that it's intended for audio, but rather that
>> its Sigma-Delta, which rules the demultiplexing out.
>
> I still think it's not entirely impossible. But probably you all are right,
> the performance would be so poor that it isn't worth the effort.
> Perhaps better use a 8053 as DAC?? Ok, I'll stop now ;-)
>
> Ingo
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