[sdiy] Midi2cv with at least 8 channels .. ?

[Seb Francis]

I'm designing one at the moment (16 channels + 4 gates).  It will be based around a PIC and MAX525BCPP 12bit D/As.  These Quad-D/As are relatively cheap, but accurate enough (+/- 1 LSB) for pitch control over a full 10V scale.  The have a serial input, so routing of the digital signals well away from the analog signals should be easier.

The D/As only give a max 5V full scale output which I plan to double with an Op Amp (running on the main +/- 15V supply).  [D/As with higher voltages are too expensive.]  I haven't looked at which Op Amps to use yet .. does anyone have a recommendation for an accurate DC Op Amp?

I'll post the schematic/PCB somewhere when it's built and tested.

Seb


Micke Askernäs wrote:

> Hello!
>
> I've seen parts of some different midi2cv converters on the web, but none
> conclusive ... Anyone on here who have any schematics or can recommend a
> good kit .. ?
>
> I need to have at least 8 CV channels, but more is preferable .. I saw
> something with 24 outputs on synthdiy.com (photo of a pcb with components on
> it) .. Anyone know anything about this?
>
> Thanks,
> //Micke

--

*======================*
 p: +44 (0)1242 694 123
 m: +44 (0)7876 020 587
*======================*