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darklife
Joined: May 20, 2018 Posts: 3 Location: US
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Posted: Sun May 20, 2018 11:29 pm Post subject:
Circuit Bent, or synth?.. Yamaha PSS-130 Subject description: Built this demon |
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Been viewing this site for some time and interested in synth design and got started circuit bending. Well I wanted to prove everyone wrong that the PSS-130 wasn't bendable but basically ended up in the same position as everyone else with these unbendable Yamahas, it's the most stubborn keyboard around and it gave me a run for my sanity.
I started with the most basic idea, pitch bend. This sounds easy right? NO.
It's crystal locked so I had to take an oscillator circuit and figure out how to feed the yamaha chip.
Well after I figured out how to do that with a CD40106 I thought .. "cool", but then the spark got lit.
I wasn't done, and it wasn't a complete project until I got far enough where I ripped out bits of plastic from inside to free the battery compartment area for more circuitry! It has room inside for bending, but it didn't for a 8 step sequencer lol.
I will type more later but I am new here and this is my first build/bend, also had a few drinks and need to get up early, but here is what I accomplished with the IMPOSSIBLE PSS-130 (equally the same as the PSS-30)...
Video of me performing a demo, skip ahead to see the sequencer, first few minutes is showing keyboard playing as is before I switch on circuits I added one at a time..
https://www.youtube.com/watch?v=I6SYIzO3dLk
Pics of the build...
https://imgur.com/a/UXI61hZ
Sorry schematics are terrible in the imgur link, I will draw them better later, but as of right now this is my first project. I am quite acquainted with RF electronics and analog stuff, but this is my first head-first into music electronics.
I'm not sure if I posted in the right area because this really bends the lines between circuit bending and synth building given that I circuit bent this keyboard but added in a lot of synth circuitry to take care of the rest.
I want to thank this form and the people here because I lurked a while and learned a lot. I hope to contribute more soon when time permits.
Hope you like
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Wed May 23, 2018 6:03 am Post subject:
Re: Circuit Bent, or synth?.. Yamaha PSS-130 Subject description: Built this demon |
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darklife wrote: | Hope you like |
pretty nice!
and _________________ Jan
also .. could someone please turn down the thermostat a bit.
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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stolenfat
Joined: Apr 17, 2008 Posts: 476 Location: Sunny Oakland California
Audio files: 1
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Posted: Thu May 24, 2018 9:20 pm Post subject:
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Saw this on Reddit last week. Glad you joined the forum darklife! Looking forward to what you do next! _________________ home made noise and electronic ill-logic |
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darklife
Joined: May 20, 2018 Posts: 3 Location: US
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Posted: Wed May 30, 2018 5:20 am Post subject:
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PHOBoS wrote: | Did you prepare the keys in any way before painting ? I had very mixed results with painting them myself. |
I used 91% rubbing alcohol on the keys to rub off some lettering the previous owner marked to know which key was which note. I think that alone helped prep them. Around 4 coats of spray paint and a few gloss clear coat. Seems to be nice and solid.
My only regret is the color choice, thinking gray keys would have been neater but I used colors I had on hand and it grew on me, plus it matches an instrument amplifier I made. Body is a kind of bronze that has a neat texture under the light that the photo doesn't capture properly.
Thanks for the compliments folks! |
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darklife
Joined: May 20, 2018 Posts: 3 Location: US
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Posted: Wed May 30, 2018 6:30 pm Post subject:
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Fun little tune I made earlier on it, only added some background guitar and a few reverb effects, otherwise it's all the Yamaha keyboard multitracked...
https://soundcloud.com/kagemichaels/defective-machine-yami
I was going for that psychedelic toying around sound and I think the keyboard nails it. |
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smmpcomposer
Joined: Oct 17, 2018 Posts: 7 Location: Brighton
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Posted: Wed Oct 17, 2018 1:34 pm Post subject:
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Yo!
Very nice stuff!You can tell tou're an expert... Would be nice to see more of the schematics though |
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PiercedFaceMan
Joined: Jun 11, 2020 Posts: 8 Location: Reading, United Kingdom.
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Posted: Thu Nov 11, 2021 7:30 pm Post subject:
Pitch bend |
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Does anybody have a schematic for this or is anyone able to draw a quick schematic of the pitch bend part.
Around the jfet and transistor I just can't figure out what's going on.
Thanks muchlee. |
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