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Old 10-04-2011, 03:15 PM
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Default Using MPA for different pot values (20k, 22k)

D. writes:

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I intend to replace analog potentiometers of my amplifier with midi-controlled digital pots. The potentiometers of my amp are 22K and 20K. Is there a way to use the MPA MIDI DECODER to replace them? Is there a posibility to customize the MPA for 20K and 22K?
The digital potentiometers for the MPA come only in 10k, 50k, and 100k values. However, there are some strategies for applications that require different resistance values.

If the application circuit only requires a variable resistor (uses only two terminals of the pot), then you can make a 20kohm variable resistor using both outputs of an MPA-10k. Just connect the two outputs in series and configure both for the same MIDI response. They will act together as a single 20kohm output.

There's a good chance that the circuit requiring 22kohm will work pretty well with 20kohm as well. But you can also add a fixed resistor in series (like a 2kohm) to change the resistance range.

Hope this helps..
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