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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Keyboard Volume Balance, Korg PS-3200
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AnalogCustom



Joined: Jun 23, 2009
Posts: 49
Location: Chile

PostPosted: Fri Dec 17, 2010 7:28 pm    Post subject: Keyboard Volume Balance, Korg PS-3200 Reply with quote  Mark this post and the followings unread

Hello!
I'm working on full polysynth desig and need add a Keyboard Volume Balance control, like the korg ps-3200 (amp). I have read the service manual, but I could not understand how it works.
Someone could help me and explain how it works?

Thanks!!!

Marco.

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jhaible



Joined: May 25, 2007
Posts: 2014
Location: Germany
Audio files: 24

PostPosted: Fri Dec 24, 2010 5:04 pm    Post subject: Re: Keyboard Volume Balance, Korg PS-3200 Reply with quote  Mark this post and the followings unread

AnalogCustom wrote:
Hello!
I'm working on full polysynth desig and need add a Keyboard Volume Balance control, like the korg ps-3200 (amp). I have read the service manual, but I could not understand how it works.
Someone could help me and explain how it works?

Thanks!!!

Marco.


From memory (don't have the schomos in front of me):

There is s atring of resistors (series connection) and each end goes into a summing amplifier. Now each voice taps into a different position of this resistor string - lowest note on one end, highest note on the other end, middle note in the middle. Then a pot (or a set of two LDRs on the 3200) crossfades between the two summing amplifie routputs.

JH.

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AnalogCustom



Joined: Jun 23, 2009
Posts: 49
Location: Chile

PostPosted: Mon Dec 27, 2010 10:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks.
I analyzed the servive manual KORG PS3xxx series. I did the simulation and experimental tests. I will use the following circuit for my project. The balance could be achieved with the scheme is a "soft balance", but enough for my synth project.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Marco

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