Shade
Well-Known Member
- Joined
- Jul 25, 2009
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I need to get back to processing brass for reloading. I have these DC gear motors. I need to build a power supply, I am doing an LC choke filter from 230 VAC. The motors only need 180V DC to run. I want to make the power supply variable voltage and I know that can be done with a transistor and a potentiometer, but I must have killed the brain cells that previously held that memory.
I have a bridge rectifier good for 25 amps, and some caps good up to 250V (300V surge) I should be able to get the transistor for free and I have pots.
What I need to know is the remainder of the circuit. And if it is easy set up the bias to limit the output to 180V max.
Rb is just a bleeder resistor so I don't kill myself with a charged cap.
TIA!
I have a bridge rectifier good for 25 amps, and some caps good up to 250V (300V surge) I should be able to get the transistor for free and I have pots.
What I need to know is the remainder of the circuit. And if it is easy set up the bias to limit the output to 180V max.
Rb is just a bleeder resistor so I don't kill myself with a charged cap.
TIA!