[sdiy] Embedded micros (micro log convertor)

[Paul Maddox]

All,

> Why not keep it on-list? It's certainly synth, and certainly diy,

This seems to be the general opinion, so I'll stick with it..
I shant be starting one :-)

Im pleased that this isnt a solely analog list, sometimes I worry that more
and more of my projects are drifting (pun?) away from analog and becoming
more digital and more processor based (though I wont do a softsynth, yuck,
not ever!)

My worry was that posting too many processor related issues would preseant
an issue with people, Im glad it wont..

so, lets start the ball rolling..

Given that a micro with a small ADC and DAC would make a fine Log convertor
(say 14bit ADC and 14bit DAC),
what output should the DAC take? Most VCOs seem to be based around Current
controlled oscillators, so should the output be current?

Of course you then hav ethe argument, why not take it to the next stage?
and get the micro to generate a sawtooth (useing the DAC) that is scalled to
the voltage on the DAC.
This would be good as you could have an even amplitude for the sawtooth ove
rthe whole range.
You would also have an accurately scaled sawtooth, to drive things such as
waveform city and alike.
You could also drop the DAC and put on an eprom ( like the monowave) ..

One of the problems is what resolution to you feel is needed for the output?
The monowave has a resolution of 0.01hz, which is too low to be noticeable,
would 0.1hz be low enough?
and the you have the ever end of teh scale, what frequency is high enough?
8Khz audio?

Paul Maddox
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