I bought an amplifier circuit board, assembled but with no case or power supply, and I'm using the transformer, caps, and diodes out of a broken old amp. Something I've wanted to know how to do for a while even before this project is slow charging capacitors from the power supply while still having full unrestricted amps and volts available to the load. Ideally I want just a temporary slow charge circuit to avoid too big of a power surge when the device is powered on. I kept the switch and fuse that is connected to the transformer out of the old amp and I don't want to be blowing fuses.
I'm not familiar enough with circuits and reading schematics to easily find the answer through research. I've spent a couple hours googling things and just can't find what I need. I've thought about using diodes, but that involves a voltage drop, I thought varistors could be useful to but I know little about them and their datasheets seem to only show surge protection specs instead of continuous use specs. I'm thinking a switch would work, but I don't know how well a mosfet would work for a delayed turn on to bypass the initial slow charge resistor and still let ripple current flow in and out.
I'm not familiar enough with circuits and reading schematics to easily find the answer through research. I've spent a couple hours googling things and just can't find what I need. I've thought about using diodes, but that involves a voltage drop, I thought varistors could be useful to but I know little about them and their datasheets seem to only show surge protection specs instead of continuous use specs. I'm thinking a switch would work, but I don't know how well a mosfet would work for a delayed turn on to bypass the initial slow charge resistor and still let ripple current flow in and out.