Need an anti-log taper pot?... Try this...

[SolderBoy]

Just had a great idea!  Like most things to do with hobby electronics etc, its probably not original, so apologies if I'm stealing your thunder...

Have read RG's article about changing tapers on linear pots, but I just thought of a great way to actually reverse the taper's rotation.


1:  buy one of these:

a 16mm single gang log pot of the value that you need,

and one of these:

a 16 mm dual gang pot (of any value) from the same shop - ie the same brand of pot etc etc.

2:  use a little screwdriver to bend up tabs of both pot casings.  Remove the lower wafer from the DG.  Lever off the plastic wiper thingie from the SG pot (put the shaft in a vice then use two screwdrivers - it'll pop off quite easily),  being careful not to damage the carbon tracks on its phenolic wafer.

3: Put the wafer from the SG pot where the lower wafer from the DG pot was and close the tabs.  (Use needle nose pliers, and perhaps a drop of super glue under each tab when you are happy that the wafer is correctly located).


Viola!  The lower half of the DG pot is now an anti-log pot!

-You might have to bend its solder lugs out or perhaps cut off the ones from the upper wafer if its not a PCB mount type with solder pins that stick straight out.

- If you were careful levering off the wiper contact thingie from the SG pot, then you can clean the shaft up with a jeweller's file, put the lower wafer from the DG pot on the SG pot, and with super glue, press the wiper thingie down on its shaft.  A punch would spread the shaft again, but I've found that the super glue works fine on its own.  If the DG pot had log tapers then you now have another (SG) anti-log pot!  And if both pots were the same value, then the DG pot is now a log/anti-log pot! 

Cool!   


SB

[stm]

Clever! 

This should go to the WIKI.

[Unbeliever]

Very nice. 

[SolderBoy]

Cheers guys...