Ang: RE: [sdiy] Radfio Shack

[Daniel Araya]

Seems like a really cool machine! Any chance of a peek at schematics,
pics or samples?

/Daniel

>>> "Fredrik Carlqvist" <ifrc at iar.se> 2004-10-21 16:26:10 >>>

>Hybrid systems would be interesting, analog sound with
>digital control.

I'm doing hybrid systems. If anyone is interested, here's my setup:

I use one simple microcontroller (PIC) to replace the VCO, LFO, ENV,
MIDI,
and interface parts of a standard synth setup. Outside it, I have a PS,
a
ramp generator, a VCA and a VCF. They are controlled using a 16-bit
DAC.
Basically this is the same setup as in a Moog Source, but on an
entirely
different scale. (also, I have several pots, not one 'dial')

So the sound chain is more or less analog, but with minimum part count.
And
I can save my patches. 

The things that are hard to do in software, I put in hardware. The
things
that are hard to do in hardware, I do in software. No hard to get
parts
(well, before the discontinuation of CA3080 that is), no expensive
parts and
full control!

I get maximum control over the CVs, since I can reprogram the micro
(via
MIDI) to do whatever I want. I don't get any alias problems, since the
oscillator is more or less analog. I don't have to do any heavy
numeric
stuff to simulate a 4-pole filter, because the filter is in hardware.
No
tempcos, because the quartz crystal that times the oscillator don't
drift. I
can switch on and off the oscillator jitter. And it all fits on one
7.5x10
cm board (3 by 4 inch for you Americans). Without SMT (except the
farging
MSOP8 DAC, gaaahhh!). 

Fredrik C