Conductive Plastic Reverse Log Pots

[soultek]

Anyone know a source for these? I know Bourns had some and maybe Spectrol/Vishay too, but I cannot find them anywhere.

Is there a trick to get a reverse log curve to adjust gain by adjusting the shunt feedback resistance of a non-inverting opamp preamplifier?

I've just been using rotary switches until now, I'd like to use a pot for my next project.

 

[CJ]

How much money you got?

Poor teenager on Mom's allowance or cooperate exec with an inheritance that would make Trump look like a Chump?

 

[jrmintz]

Omeg

 

[soultek]

[quote author="CJ"]How much money you got?

Poor teenager on Mom's allowance or cooperate exec with an inheritance that would make Trump look like a Chump?[/quote]


Neither unfortunately (or fortunately?)

 

[CJ]

Alps are nice. But $$$.

For stereo, sometimes carbon will track better from channel to channel, as far as matching is concearned.. Thats what I heard at least.

 

[Brian Roth]

[quote author="soultek"]Anyone know a source for these? I know Bourns had some and maybe Spectrol/Vishay too, but I cannot find them anywhere.

Is there a trick to get a reverse log curve to adjust gain by adjusting the shunt feedback resistance of a non-inverting opamp preamplifier?

I've just been using rotary switches until now, I'd like to use a pot for my next project.[/quote]

They were a "special" even back in the 1970's. Expect to pay BIG bucks if you can even find one. You're looking at minimum order sizes of maybe 100 pieces.

Bri

 

[gyraf]

Omeg in the u.k. will make just about anything in quantities of 25pcs, including conductive plastic track types.

Not very expensive at all, but the "feel" is not as good as you may want.

The quality is decent though - specially considering the price.

Jakob E.

 

[Rob Flinn]

Omeg in the u.k. will make just about anything in quantities of 25pcs, including conductive plastic track types.

Last time I ordered from them I`m sure they said quantities of 10 upwards.

 

[Svart]

what values are you looking for? A group buy might be in order.. I'm in need of some reverse log pots for a few projects..

 

[Flatpicker]

[quote author="Svart"]...A group buy might be in order...[/quote]Yes! :thumb:

 

[rlaury]

Check this if you haven't already.
Good info.

http://www.geofex.com/Article_Folders/potsecrets/potscret.htm



RonL

http://www.nashaudio.com

 

[alk509]

[quote author="rlaury"]http://www.geofex.com/Article_Folders/potsecrets/potscret.htm[/quote]

Here we go again... :evil:

You can't make a C-law pot of the kind we audio folk need in the way described on that site. It cannot be done - do the math.

Mr. Keen should really revise that article, as it keeps popping up every few months...

Peace,
Al.

 

[Slenderchap]

We stock the following Sfernice PA11's....

1K rev log
47K rev log dual gang
47K rev log quad gang

If that is any help.

Colin
www.audiomaintenance.com