Can ya'll help me find these Pots?

[sjaltenb]

hey ya'll

Im doing 4 BYOC projects and I need to know the best place to get pots. Im not real familiar with all this stuff, i just bought the PCBs and have located almost all the components I need on SmallBear- a really great site- but on the BYOC lists it says things like B50k ...what is the letter stand for? It says I need the following:


Fuzz: A500K audio Volume Pot, B1(2)K Linear Fuzz Pot

808: 500Ka Pot, 25KB Pot, 100Kb Pot

Trem: B1Meg Pot, A25K Pot

Comp: 1 - B500K Linear sustain pot
1 - C250k Reverse Audio attack pot
1 - A50k Audio level pot

If someone would be kind enough to maybe sort these out and help me figure out which are which i would REALLY appreciate it!! I have a huge shopping cart full of stuff on SmallBear right now so that would be preferred!

[WelshWonder]

When reading pot values the letters determine the taper of the pot for example, A stands for Audio or Logarithmic, B is Linear taper and you will sometimes come across C which is reverse taper.

Smallbear should sell these pots, although you may have difficulty finding the reverse log taper pot.

[sjaltenb]

Thanks!
So, A and C are both audio?..

What about 16mm vs 24mm. Is that the lenght of the shaft? If so, which is standard. Thanks again.

[WelshWonder]

Sorry typo, just corrected it, C is reverse taper. best go with 16mm ones as they have a smaller body with will be a godsend as enclosures can get fairly cramped.

16mm and 24mm are not the length of the shaft, it's the diamter of the body.

[Torchy]

Be careful.

USA and European taper designation letters are different. This explains it quite well.

http://www.generalguitargadgets.com/index.php?option=content&task=view&id=18&Itemid=5

The most common designators are :-

A500K = 500K Logarithmic, Log, Audio
B500K = 500K Linear, Lin
C500K = 500K Reverse Log, Antilog
G500K = 500K Modified Log
M500K = 500k Modified Antilog


The G and M suffixes/prefixes indicate that the pot is not uniformly logarithmic across its travel and usually mean the resistance curve looks like a hysteresis curve - short description is a log/antolig curve with a flat spot at half-rotation. Not a common pot thankfully.

16 and 24mm are the physical diameter of the pot. Shaft length is usually separately quoted.

[sjaltenb]

Thanks for the quick replies. I think I may be posting on here quite often as I am slowly beginning to compile everything for my 12(so far) effect Cornish style Board!

[sjaltenb]

Im not finding a listing for a 25K Audio Taper Pot...not even in Mouser...anyone know?

[WelshWonder]

22k will do, 25k are not standard so you will have trouble finding them...

[tjcombs]

Check this out for more info

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