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 Forum index » DIY Hardware and Software » Circuit Bending
Yamaha PSS-270 Modifications
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seaweedfactory



Joined: Apr 12, 2006
Posts: 74
Location: Portland, Maine

PostPosted: Mon Dec 12, 2011 5:01 pm    Post subject: Yamaha PSS-270 Modifications Reply with quote  Mark this post and the followings unread

I usually post finished circuit-bent creations, but here's a work in progress and some documentation. The Yamaha PSS-270 is a FM keyboard with a multitude of cool presets and an analog chorus. Here's the first round of discoveries: an octave drop, chorus depth, chorus morph feedback, overdrive, and a sustain twister.

This is still a work in progress, so I'm not sure how these modifications will interact with each other. The connections are marked with colored circles, with an explanation of the provided for each color.

UPDATE:

I found a chorus speed modification and a randomize function. I've also figured out the limiting resistors. The diagram has been updated to reflect the new discoveries.


yamaha-pss-270-guide3.JPG
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Updated schematic.
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yamaha-pss-270-guide3.JPG



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seaweedfactory



Joined: Apr 12, 2006
Posts: 74
Location: Portland, Maine

PostPosted: Fri Dec 30, 2011 6:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's the finished keyboard:




Hexagon Eye is a circuit bent Yamaha PSS-270. Chorus speed, depth, and morphback controls have been fitted. Morphback adjusts the chorus feedback and changes the timbre of the chorus signal simultaneously. An overdrive control is also provided. The sustwist control emphasizes the decay tails of sounds and brings out higher harmonics. An octave drop switch pitches notes down. The randomize switch produces new timbres when active during a patch change. When in use, the keys will play shifting sounds. All controls are fitted into a side cart to allow plenty of room and easy identification for live use.


pss270-1.JPG
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close-up of circuit-bent pss-270
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pss270-2.JPG
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circuit-bent pss-270
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pss270-2.JPG



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