Korg Poly 61 converted to a 19" rack mount
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- Опубликовано: 29 сен 2024
- I built the Tauntek replacement CPU board for my Poly61 to add MIDI and extra options, better parameter resolution etc. Then I thought I could buy some Poly 61 boards and build another CPU board and try and build another 61 into a rack as a module rather than a keyboard. I bought a bunch of boards from Germany, unfortunately the anti board never arrived, but I got a voice board, clock board, rear panel and ARP board. Based on these I built a new front panel using the Korg schematics which included my version of the ARP board but with buttons instead of slide switches. I had some faults when I first powered it up, swapped power cable, missing power to an opamp etc. So after resolving these I had a bad sound from voices 1 & 6, these took a while to resolve as it turned out I had used the wrong resistor on my anti board build. It sounds great now, but suddenly an extra segment is illuminated in the displays and I've no ideas why yet. Still got the pitch bend to resolve too.
Awesome Craig!
Wow, impressive work!!! 👌😮👍
this is really cool. NIcely done. I have just repaired a very bad Opera 6 which also uses SSM2056 envelope chips. I hope to also use the Electric Druid as I need 3 new EG chips and at £40 a pop, it's prohibitive.
Did you just use an op amp to amplify the voltage from the SSM original socket to the new chips 5v rail? thanks
@@waheex not just amplify, also invert voltages. Obviously everything needs to be 0-5v for the ENVGen8C chips, so measure what is currently used for the existing ADSR voltages and calculate with opamps what you need to convert them to 0-5v, the sustain voltage may already be 0-5v.
That's an insane amount of work for a humble poly 61. It's a very good sounding 80's poly synth and one my favorite (I even prefer it over poly 6 ) to play now after having replaced conductive rubber parts and installing midi. Any interesting quick mods?
It's not really, most of the work went into making wiring harnesses, the rest is boards off ebay and some work of my own. I have a Poly61 keyboard so it removes the need for this keyboard and makes room for something else not available in rack form. I'm retired so I have time to do these things, plus its a much improved Poly61 with MIDI, extra LFO, MIDI sync of the Arp, control changes for parameters, higher resolution of parameters, program changes etc.
This is great work. Saw your posts on diy synths. I am currently building a sequencer run by the ATMEGA328-AU custom board. I can appreciate your hard work. You have done a great job with this. Will you be going to Synthfest Sheffield?
Thanks, no, I'm based in Ukraine, Sheffield is a long way to drive.
@@craigyjp I see, that's a shame. I wish you all the best with your synth. Will you be putting it back in the original case to resemble the original synth.
no, this poly61 never had an original case and keyboard as it's made up of second hand parts from eBay and home made bits, I have a poly61, so this can be an expander for 12 voices or a standalone synth.