Is it possible to make rev log pots from log pots?
- Thread starter syn
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bcarso
Well-known member
[quote author="syn"]I need some pots 50k alog dual gang.I was thinking to use 50k log instead
if it would be possible to reverse them somehow.
Thank you[/quote]
You can do it with two gears, but it won't feel very good without some pretty decent bearings and maybe one anti-backlash gear as well.
Probably a lot more work than sourcing the rev log pot.
Some potentiometers used to be available as kits, and might be adapted to assembling the elements flipped over from the normal configuration.
if it would be possible to reverse them somehow.
Thank you[/quote]
You can do it with two gears, but it won't feel very good without some pretty decent bearings and maybe one anti-backlash gear as well.
Probably a lot more work than sourcing the rev log pot.
Some potentiometers used to be available as kits, and might be adapted to assembling the elements flipped over from the normal configuration.
nrgrecording
Well-known member
look here: http://www.gyraf.dk/gy_pd/calreq/magnus_j/rebuilding_pot.htm
The pots there are looking like alpha pots, some potentiometers are riveted which makes it hard to open and rebuild them.
Omeg uk could make these pots, at least if you buy 10 of them.
Frank.
The pots there are looking like alpha pots, some potentiometers are riveted which makes it hard to open and rebuild them.
Omeg uk could make these pots, at least if you buy 10 of them.
Frank.
[quote author="Crusty2"]An old trick to use the standard log pot is to put your number scale on the skirt of the knob, and your pointer mark on the faceplate. The numbers still go up, but you're actually turning the pot backwards.[/quote]
Ah...that's very clever. I never heard that before.
:thumb:
Ah...that's very clever. I never heard that before.
:thumb:
bcarso
Well-known member
That's the way old Tek scopes' vertical gain switches work, where it was an expedient to showing the sensitivity for use of two different probes. I like the application to pots though.
Now we will have a whole new topic of diy knob manufacture!
Now we will have a whole new topic of diy knob manufacture!
tk@halmi
Well-known member
[quote author="Crusty2"]An old trick to use the standard log pot is to put your number scale on the skirt of the knob, and your pointer mark on the faceplate. The numbers still go up, but you're actually turning the pot backwards.[/quote]
That works if the numbering starts with 0 (or 1) on the left end of the scale. Unfortunately, most numbered knobs sold have the numbering start at the right end of the scale. However, you can always make your own knobs. I recommend burly elm finished with C37.
OR
These folks are selling dial plates with the right scale.
http://www.electro-nc.com/rotaryus/knob.pdf
These plates could be turned into skirts by glueing a knob on top of them.
That works if the numbering starts with 0 (or 1) on the left end of the scale. Unfortunately, most numbered knobs sold have the numbering start at the right end of the scale. However, you can always make your own knobs. I recommend burly elm finished with C37.
OR
These folks are selling dial plates with the right scale.
http://www.electro-nc.com/rotaryus/knob.pdf
These plates could be turned into skirts by glueing a knob on top of them.
ciminosound
Well-known member
Check out RG Keens page at http://www.geofex.com/Article_Folders/potsecrets/potscret.htm .
Might have the info you want.
Might have the info you want.
> Check out RG Keens page
The tricks at the bottom work, sort-of, for potentiometers, 3-terminal voltage dividers.
Around here, when someone says "reverse log pot", what they usually want is a rheostat, a 2-terminal device (though generally we use a 3-terminal "pot"). We use these for mike gain control and filter frequency controls. These applications can NOT "reverse log" with a loaded pot.
The tricks at the bottom work, sort-of, for potentiometers, 3-terminal voltage dividers.
Around here, when someone says "reverse log pot", what they usually want is a rheostat, a 2-terminal device (though generally we use a 3-terminal "pot"). We use these for mike gain control and filter frequency controls. These applications can NOT "reverse log" with a loaded pot.
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