I’d like to have continuous variable control of the motor in my bench vibrator/polisher. It has a DC (not AC!) motor that is rated at 90 VDC with a power supply that delivers 10 amps. I prefer to build something myself. Anyone have some design tips, or better yet, a schematic?
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What about using a variac with a standard full wave rectifier and large filter capacitors? The schematic lists several commercial components.
Several things to mention before any attempt at construction.
Here is the "wrong" answer to the problem: Harbor Freight sells a Router Speed Control for $20. Plug it in between the wall outlet and your tool. See if it does what you want. If not, take it back and they will give you your money back.