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Vintage threads from the first ten years
Emulating Audio Taper
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 5/17/2000 2:48 PM |
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Donnie |
Emulating Audio Taper I heard something about emulating audio taper with a linear taper pot and a resistor wired across it. I'm sitting here making MatLab plots, but can't seem to figure out how to do it, and can't remember who told me about this - anybody know what I'm talking about? |
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| 5/17/2000 6:40 PM |
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| Reid Kneeland |
There are several ways to do this; there's some good info at http://www.muzique.com/lab/potmod.htm and http://www.geofex.com/Article_Folders/potsecrets/potscret.htm We beat this one to death here a few weeks ago; the bottom line is that this is a useful approximation, but won't work in all circuits that require a log taper. For instance, the series resistance from the input to the output (in a typical volume control) will indeed come close to audio taper for that pot value, but the shunt resistance from the input to ground will not. If your circuit depends on having the full value of the pot between the signal and ground (when volume is up all the way), this won't work because the resistor is in parallel with the pot, greatly reducing the effective R. One application where this works great is in a pan control (such as the pickup pan on active basses). Ganged log/antilog pots are not easy to find, but you can use ganged linears and two resistors to create a more audio-like taper (see DIY Projects for Guitarits by Craig Anderton, in the section on pickup wiring). Reid |
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