I recently purchased a constant voltage constant current 30amp Buck converter to use DIY power supply. I want to remove the two 10K trim pots on the buck converter and install them on the housing power supply case. I have ran out of 10K potentiometers and have a whole bunch of 50K. I've seen threads people putting resistors on the potentiometer do this but with not much explanation.

What would be the best way of going about this

Thx u

 

I recently purchased a constant voltage constant current 30amp Buck converter to use DIY power supply. I want to remove the two 10K trim pots on the buck converter and install them on the housing power supply case. I have ran out of 10K potentiometers and have a whole bunch of 50K. I've seen threads people putting resistors on the potentiometer do this but with not much explanation.

What would be the best way of going about this

Thx u

Purchase two 10K potentiometers.

Should be less than $2 plus shipping. Amazon has a pack of 5 for less than $4.

 

I recently purchased a constant voltage constant current 30amp Buck converter to use DIY power supply. I want to remove the two 10K trim pots on the buck converter and install them on the housing power supply case. I have ran out of 10K potentiometers and have a whole bunch of 50K. I've seen threads people putting resistors on the potentiometer do this but with not much explanation.

What would be the best way of going about this

Thx u

Hi,

Since you have so many of them, connect five in parallel.
Then also mount a sprocket to the turn shaft of each one. Run a chain over all the sprockets so that when you turn one, you turn all five.
<big chuckle>

That's really the only way you'll get a true 10k pot.

As 'dj' in the previous post said, the best way to to buy a 10k pot and save the 50k ones for something else.

 

Are they used as rheostats (only two connections used) or potentiometers (all three connections used)?
If they used as rheostats then you could use a 50K pot with a 12.5k resistor in parallel which will make the resistance vary between zero and 10k but the result will be vey non-linear - most of the variation happening towards the zero end of travel.

Still better to get some 10K pots.

 

Hi,

Since you have so many of them, connect five in parallel.
Then also mount a sprocket to the turn shaft of each one. Run a chain over all the sprockets so that when you turn one, you turn all five.
<big chuckle>

That's really the only way you'll get a true 10k pot.

As 'dj' in the previous post said, the best way to to buy a 10k pot and save the 50k ones for something else.

I think there's a market for your chain driven, 5 parallel pots product!!! It's not exactly steampunk, but it would be fun, ridiculous, and stylized - should be worth something.

 

I think there's a market for your chain driven, 5 parallel pots product!!! It's not exactly steampunk, but it would be fun, ridiculous, and stylized - should be worth something.

While at it, why not install a stepper motor at one of the sprockets, drive the stepper with an up/down push buttons.

 

Are they used as rheostats (only two connections used) or potentiometers (all three connections used)?
If they used as rheostats then you could use a 50K pot with a 12.5k resistor in parallel which will make the resistance vary between zero and 10k but the result will be vey non-linear - most of the variation happening towards the zero end of travel.

Still better to get some 10K pots.

Hi,

That's actually a good question. The resistance curve for a 50k pot as rheostat and a 12.5k fixed resistor is definitely curved but not too bad.

In the image, the horizontal is the 50k pot resistance adjustment and the vertical axis is the total resistance.
The second long image (click it to view) is drawn with a 1:1 aspect ratio so the two scales appear to be the same size.