WTD: 22K reverse taper pots for API

Archived from groups: rec.audio.pro (More info?)

Looking for 4 or more
orange@the-spa.com
Thanks,
Greg

Archived from groups: rec.audio.pro (More info?)

Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote:
>orange wrote:
>
>> Looking for 4 or more
>> orange@the-spa.com
>
>You think someone may have them on the shelf ? You'll be lucky ! It's
>normal to come back to the ng to see somments btw rather to expect ppl
>to email you.

If "more" involves as many as 500, try Sfernice. Their US office is
shared with Spectrol. They do have several reverse log tapers available
but you'll basically have to buy out a whole production run.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

Richard Crowley <rcrowley7@xprt.net> wrote:

> Or, if it is connected (typically) as a variable resistance
> (rheostat) rather than as a potentiometer, you could try
> the shunt trick where you use a 22K linear pot with a 2K2
> resistor from the "hi" end to the wiper.

Unfortunately, that trick doesn't work when you need a reverse-taper
rheostat. Try it, there's no way to make it taper the right direction.
You can make it worse than linear, but not better.

My solution is to use a rotary switch with a series of resistors to
constitute a stepped pot. I've been making circuitboards for this
purpose, but it's tough finding a steady supply of high quality vetical
PC-mount 1P10T+ switches at reasonable prices.

The other solution is to use a normal audio-taper pot and just live
with the fact that clockwise makes it quieter.

And don't worry about it being 22k. 25k or 10k or 50k is fine. The
value of the pot constitutes the minimum gain setting for an API-type
circuit, so a 25k audio taper pot will have a minimum gain setting
slightly lower than the 22k pot, and the resolution will be 13.6%
worse. Not a major problem. If you want accuracy, then use a switch.
If you want resolution, then use a switch with more steps.

ulysses