[sdiy] TOG-top octave generator replacement for MG-1

[Tom Wiltshire]

It can be done with a CPLD, but a basic PIC can't manage it in a single chip.

I did a PIC+divider solution, but it wouldn't be a drop-in replacement. I think some people have done CPLD-based daughter boards which can be used for repairs.

http://electricdruid.net/adventures-in-top-octave-generation/

HTH,
Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================




On 7 Jun 2017, at 19:36, KA4HJH <ka4hjh at gmail.com> wrote:

> I'm still preparing to refurbish a Radio Shack Concertmate MG-1. The TOG chip is blown. Is there a modern replacement for the original chip, like a PIC or something? I had to jury rig the keyboard contacts to 5V to get the envelope to trigger and I'd like to put it back into original condition while I'm working on it.
> 
> I know this has been discussed before but a search of my email archives turned up almost nothing.
> 
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> 
> 
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