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realblades21/09/2016
I have this thing running an old car cooler fan motor off 12 V set in a steel box with a switch on the supply side. This is working well and I haven't managed to overload or break it yet despite stalling the motor.
It's a common oscillator + low-side (cuts negative line) transistor combo with a PTC over current protector. Cycle time seems to be about 40 us, meaning 25 kHz switching. There is no whine audible to me. The pot has an on-off switch. It seems to go full-on at the top of the range according to my scope, but the bottom end is closer to 10% dut than 0%. Of course the off switch puts you to 0%, so it's quite honest in that sense.
Handy little thing.
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