Korg Poly800/EX800 Users

Finally!  I got it to work!


https://youtu.be/nDtjK7ml0eo

I figured I would make a few of them since I have five chips.

1st one I plan to use as simple VCF with basic cutoff/resonance knobs and fit it inside a Casio CZ-101 I have to tinker with.

Another module I thought of making would include an ADSR, an LFO and perhaps use a PIC or Arduino to control them all via MIDI CC's.
I have several SSM 2056 ADSR chips from a Korg Poly 61 that may be easy to get quick responses from

DAC's are dirt cheap anymore..  I got two of these recently

PCF8591 AD/DA Converter Module Analog To Digital Conversion Arduino+Cable UL

 

very simply to control with Arduino via I2C

On Thu, Jan 28, 2016 at 04:45:24PM -0800, bperkins211@... [korgpolyex] wrote:

> I figured I would make a few of them since I have five chips.
>
> 1st one I plan to use as simple VCF with basic cutoff/resonance knobs and fit it inside a Casio CZ-101 I have to tinker with.
>
> Another module I thought of making would include an ADSR, an LFO and perhaps use a PIC or Arduino to control them all via MIDI CC's.

You can use the PWMs on the AVR to generate your control voltages. It's better if you don't use analogWrite() from the Arduino libraries and set up the PWM "by hand" so you can run it at 32kHz because that way you don't need as brutal a filter to remove the ripple.

> I have several SSM 2056 ADSR chips from a Korg Poly 61 that may be easy to get quick responses from

Sell them to someone who needs to fix a Polysix/Poly 61.

--
Gordonjcp MM0YEQ