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 Forum index » DIY Hardware and Software » Circuit Bending
Yamaha PSS140 Volume Control
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CHRISKELLY



Joined: Apr 08, 2018
Posts: 100
Location: England
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PostPosted: Mon May 06, 2019 11:26 am    Post subject: Yamaha PSS140 Volume Control Reply with quote  Mark this post and the followings unread

I've been tinkering with a Yamaha PSS140 lately. The volume buttons act as a kind of Bit-Crush where as the sound gets quieter it gets grainier and more lo-fi. There are 11 steps from max volume to silence.

It'd be nice to find a way to boost the actual overall volume while simultaneously reducing the volume on the keyboard, so that lowering volume becomes increasing the bit- crush effect.

So far I can only raise/lower volume using button presses. My idea is to be able to press a button which not only shifts the volume but also changes the resistance on an opamp' feedback loop, so that each of the steps has its own gain level to keep the overall volume fairly constant.

(Hope that makes sense?!)

Assuming i can find momentary buttons with two poles then i was thinking 1 pole could interact with the volume circuitryon the keyboard and the other interacts with some kind of analog switch like a 4051 which could have 10 outputs, each with a different resistor to alter the opamp gain. I wondered if each button press could advance a binary counter which in turn moves the 4051's output.

The thing is - how can 2 separate push buttons move a binary counter both forwards (count up) and backwards (count down)?

Not sure if this idea is even possible. The more i think about it the more it seems to just need a micro-controller to achieve this.

Any ideas would be appreciated!
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gabbagabi



Joined: Nov 29, 2008
Posts: 560
Location: Berlin by n8
Audio files: 23

PostPosted: Mon May 06, 2019 12:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

as iam not the digital hero,
but every idea is welcome,
i throw this in:
cd4516 as up-and-down counter and cd4067 in the opamp feedback loop,
as cmos is working with positive voltage, the 4067 should be placed in the feedback of the second opamp from a pair of inverters

as u already mentioned a little µProcessor and 4 line of code could be more elegant as the 4516

good luck in any case


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CHRISKELLY



Joined: Apr 08, 2018
Posts: 100
Location: England
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PostPosted: Mon May 06, 2019 12:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, thank you Very Happy

That's what I had in mind - but I hadn't heard of the 4516 before.

If the push-button can send a one-shot pulse to the direction input and the counter clock then this should work!

Thanks again
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Blue Hell
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Joined: Apr 03, 2004
Posts: 22905
Location: The Netherlands, Enschede
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G2 patch files: 319

PostPosted: Mon May 06, 2019 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Or .. maybe a guitar compressor?
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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