Log/lin pot A/B suffixes & prefixes

I think it`s A = lin, B = log except when it isn`t ;)

the marking conventions changed some time ago

law of a pot should cause no grief to anyone, right? Wrong! It wouldn't have been so bad if someone hadn't decided to change it, and even then, it wouldn't have been so bad if there was no overlap between the "old" and "new" "standards" ... I think you can see where this is headed by now.

make assumptions, or you can easily get the wrong type - especially if working on older equipment.

marked as 100K - but not always. The coding system used for capacitors is sometimes used as well (especially on small trimpots), so a 100k pot could also be marked as 104 - 10, followed by 4 zeros, or 100000 (100k) ohms.

Ron(UK)

Are you the author? If so, congratulations for a useful little piece.

--

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW To e-mail, change noise into sound.

No no, it`s part of a wonderful resources site ESP which contains a huge amount of useful info

I thought that I`d put a attribution to the site just before my header, but it seems to have gone awol.

Ron(UK)

A = linear (European) or Audio taper (Japanese).

B = 'log' taper (European) or linear (Japanese)

Graham

There are no meaningful conventions except that C universally means 'reverse log'.

Graham

so its a matter of ignoring everything other than the likes of 50K and measuring ohms at 1/4,1/2,3/4 and full track

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

connecting the pot to an analogue meter and sweeping from end to end will show whether it`s log or lin.

Ron(UK)

What does the resistance value have to do with it ?

Graham

You don't even need to go that far. Set to approx 1/2 travel and measure one side. Linear will be near 50% - log very much not.