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Old 17th June 2013, 10:02 PM   #11
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nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
Originally Posted by macboy View Post
Stick with an analog circuit, and use digital potentiometers in place of the traditional ones.
, which you can interface directly to buttons or a suitable rotary encoder.
I designed a PC controlled mixer and used digital pots for volume and tone controls.
It worked very well but it is important that the DC levels are kept within 0 to 5volts or you will get distortion and/or clicking in the audio stream.
I used a PIC18f4550 to control the mixer via USB. The PC had volume and tone control sliders on it.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 18th June 2013, 01:12 AM   #12
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Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
If anyone is interested, post #18 has the updated version.
A usable tone control

By the way, the schematic shows a row of SPST switches for tone adjustment only because that is all the TI Tina spice program has available. Of course practically any type of switch arrangement will work, I'm using two 2P23T rotary switches on mine.

Last edited by Michael Bean; 18th June 2013 at 01:22 AM.
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