I have trimmers 3296 and 3006P, but i need to vary at the same time two resistors(from 10 Ohm to 10kOhm). is there any kind of trimmer(a conventional potentiometer is too big) that I can use?

Could I make one by myself at home? How?

 

I have trimmers 3296 and 3006P, but i need to vary at the same time two resistors(from 10 Ohm to 10kOhm). is there any kind of trimmer(a conventional potentiometer is too big) that I can use?

Could I make one by myself at home? How?

What does your circuit look like? Maybe there is another solution other than a matched potentiometer / trimmer. I assume there is another (easier/cheaper) solution because it is unlikely you are the first person to have this problem - and yet, the suppliers don't offer a solution.

 

What does your circuit look like? Maybe there is another solution other than a matched potentiometer / trimmer. I assume there is another (easier/cheaper) solution because it is unlikely you are the first person to have this problem - and yet, the suppliers don't offer a solution.

There has to be a reason they are not readily available. My guess is trimmers are too fragile for dual gang.

Here is a pot that is only 12mm

http://www.alps.com/prod/info/E/HTML/Potentiometer/RotaryPotentiometers/RK09L/RK09L12D0A1W.html

Looks like this one only 8.8 mm

http://www.mouser.com/ProductDetail/ALPS/RK08H122005A/?qs=sGAEpiMZZMtC25l1F4XBU3JeeCo7XMTl55QAFLjxm2c=

Did not check the values and maybe these not small enough. But at least you know small dual gang pots exist.


You could try gluing a couple of this type together.
http://www.mouser.com/ProductDetail/Bourns/3352T-1-103LF/?qs=sGAEpiMZZMvygUB3GLcD7rufck0TIBKy5gx03CoSSR0=

 

I should note that I am not a big fan of this type of trimmer.
http://www.mouser.com/ProductDetail/Bourns/3352T-1-103LF/?qs=sGAEpiMZZMvygUB3GLcD7rufck0TIBKy5gx03CoSSR0=

They seem hard to get a very fine adjustment. I am sure the mild tremors in my hands don't help much.

And I am thinking you would need to glue them opposite positions (one counter clockwise to the other) if you put them face to face.

 

I have trimmers 3296 and 3006P, but i need to vary at the same time two resistors(from 10 Ohm to 10kOhm). is there any kind of trimmer(a conventional potentiometer is too big) that I can use?

Could I make one by myself at home? How?

https://datasheets.maximintegrated.com/en/ds/DS1267B.pdf

 

There are SMD trimmers available which are adjustable from the top and bottom. Perhaps you could stack two of those and use a common adjustment shaft?

 

What does your circuit look like? Maybe there is another solution other than a matched potentiometer / trimmer. I assume there is another (easier/cheaper) solution because it is unlikely you are the first person to have this problem - and yet, the suppliers don't offer a solution.

I recall dual presets in old TVs that I disassembled many years ago. Still there should be one around somewhere. Bulky to say the least.

Now, two matched pots means two equal voltages going to two different points in the circuit.

I believe is the same as generating just one voltage and solving how to deliver it to those two points. Unity gain buffers with a dual op amp into play?

 

Hello,

Vishay has some small (9mm) potentiometers.
Honeywell has potentiometers that can be stacked.

Bertus

 

I recall dual presets in old TVs that I disassembled many years ago. Still there should be one around somewhere. Bulky to say the least.

Now, two matched pots means two equal voltages going to two different points in the circuit.

I believe is the same as generating just one voltage and solving how to deliver it to those two points. Unity gain buffers with a dual op amp into play?

I'm just saying it would be nice to see the OP's circuit - there are options to supply the same voltage or current to two different circuits without a ganged dual trimmer. A small SOIC dual op amp can do this with one POT, for example...

 

And trimmers while a type of potentiometer are not to be used as a pot. They are meant to just 'fine tune' in a circuit, a set and forget if you will. They aren't robust enough for normal pot use.

 

I recall dual presets in old TVs that I disassembled many years ago. Still there should be one around somewhere. Bulky to say the least.

Now, two matched pots means two equal voltages going to two different points in the circuit.

Not necessarily, since two matched pots can have different end-to-end voltages.

 

I have trimmers 3296 and 3006P, but i need to vary at the same time two resistors(from 10 Ohm to 10kOhm). is there any kind of trimmer(a conventional potentiometer is too big) that I can use?

Could I make one by myself at home? How?

Most dual gang pots are logarithmic for stereo audio volume controls.

There used to be stackable preset pots - but they've become much harder to find since they've been designed out and replaced by settings in NVRAM configuration chips.

 

Not necessarily, since two matched pots can have different end-to-end voltages.

Then why to have them ganged?

If one voltage has to be proportional to the other, op amp A is unitty gain buffer and B a multiplier. Still just one preset.

 

Then why to have them ganged?

If one voltage has to be proportional to the other, op amp A is unitty gain buffer and B a multiplier. Still just one preset.

Not one "preset", whatever that's supposed to mean, but one shaft driving both pots or one pot driving both opamps, which is nothing like what you proposed initially.