[sdiy] frequency counter

[Tom Wiltshire]

On 25 Oct 2009, at 12:34, Antti Huovilainen wrote:

> On Sun, 25 Oct 2009, Ingo Debus wrote:
>
>> Am 25.10.2009 um 01:35 schrieb Magnus Danielson:
>>
>>> 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 Argh, why use such an ugly and outdated chip these days?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.

T.