[2] Japanese pots : A is B and B is A ?

[Chris Crosskey]

On Thu, 20 Feb 1997 10:50:51 Tom Verheyden <h5020503 at r wrote: 
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>At 15:25 20/02/97 +0100, you wrote:
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>>Hi !
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>>I heard that for japanese pots, A is log and B is lin...

*S*N*I*P*

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>Ofcourse it's important wich type of pot you use, When you turn a linear
>one, the resistance will increase (decrease) linear, with a log. one it
>increases logarithmically.
>But I think that a B-type is a log. type!!!!
>

Hi guys,
	I'm going to put on my professional electronics buyer hat here
(It's what I do for a job) and state that as far as I am aware 
different companies define lin and log as being A or B in an entirely 
arbitrary manner. From one company to the next there is no logic. 
However, if you buy a linear pot and strap a resistor equivalent to 
one tenth of it's value between the low side and the centre it is a 
very close approximation to a log pot, and if you are using cheap 
pots, it is a lot better than a cheap <LOG> pot which will just be 
four straight line sections joined together. I normally design around 
this technique unless the situation demands an expensive cermet pot 
anyway. 
BTW, what I do for a job is buy electronics, not wear hats <BG>.

I've just read another posting from Kevin abouth this, and I have to 
disagree, I've got A marked pots in my box that aer definitely linear
and B's that are definitely log. The resistor trick can be pulled 
across the high side and middle if you need a cheap anti-log BTW,
kinda handy in Moog filter resonance loops 
chrisc