Hi
I'm looking forward for a multiturn potentiometer with a "gear".
Something like a tivoli radio has for the tuning knob
(an "inner and outer" knob the with different speed ratios).
maybe a spare part ?
thanks in advance
gebi
I'm looking forward for a multiturn potentiometer with a "gear".
Something like a tivoli radio has for the tuning knob
(an "inner and outer" knob the with different speed ratios).
maybe a spare part ?
thanks in advance
gebi
I don't know if this will help you at all.
(EDIT: upon reading your post again I don't think this will help, besides, I already wrote this reply.......but it's interesting stuff anyways. I do have a "multiturn dial" that is geared to fit on a single-turn pot....but it's not dual-ganged. I'll keep an eye out for one like you want though.)
You can always add gears yourself to the shaft:
-Gear touches gear, or
-And a chain to connect them, or
-A wrap-around cable with a spring tension bearing.
Did you want a 1:1 ratio ?.....so you could turn both pots equally ?
Problem there is getting each pot to start and end at the same point/value. Quite fiddly.
Look at some of the older HP units....they often have wonderfully engineered geared (open air) tuning capacitors....but usually that's to "gear-down" the rotation of the turns, to get accuracy.(slow down the turns).
A really old Gereral Radio Distortion Meter I saw has gears and a chain to turn a few parts at once.
Take a look at this dual variable ratio transformer I am about to put on ebay......
The way it's configured, as one is increasing, the other is reducing...with one shaft.
Here is another (rare) geared switch I have....both turning in the same direction....a center gear, with another gear on each switch. They turn equally, but accuracy is not critical, because it's a switch, not a pot.
I imagine if super-engineered.....the same technique could be used. The smaller gear is for a multi-turn pot, and a larger gear for a single turn pot.
10:1 ??
(EDIT: upon reading your post again I don't think this will help, besides, I already wrote this reply.......but it's interesting stuff anyways. I do have a "multiturn dial" that is geared to fit on a single-turn pot....but it's not dual-ganged. I'll keep an eye out for one like you want though.)
You can always add gears yourself to the shaft:
-Gear touches gear, or
-And a chain to connect them, or
-A wrap-around cable with a spring tension bearing.
Did you want a 1:1 ratio ?.....so you could turn both pots equally ?
Problem there is getting each pot to start and end at the same point/value. Quite fiddly.
Look at some of the older HP units....they often have wonderfully engineered geared (open air) tuning capacitors....but usually that's to "gear-down" the rotation of the turns, to get accuracy.(slow down the turns).
A really old Gereral Radio Distortion Meter I saw has gears and a chain to turn a few parts at once.
Take a look at this dual variable ratio transformer I am about to put on ebay......
The way it's configured, as one is increasing, the other is reducing...with one shaft.
Here is another (rare) geared switch I have....both turning in the same direction....a center gear, with another gear on each switch. They turn equally, but accuracy is not critical, because it's a switch, not a pot.
I imagine if super-engineered.....the same technique could be used. The smaller gear is for a multi-turn pot, and a larger gear for a single turn pot.
10:1 ??
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