i am really in needing to know how

[elaria]

how can i protact the variable resistor from burning at 40v dc

 

[i_build_stuff]

Either use a higher-rated pot, or modify the circuit to take one with a higher resistance.

Depending on the circuit, you can also replace it with active components.

 

[Andy1845c]

Yeah, you will need a variable resistor that can dissapate more heat, or you will need to reduce the amout of current though it.

What is it for?

 

[Hero999]

Please post a schematic.