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43% OFF Regolatore di velocità del motore a bassa tensione DC 1.8V 3V 5V 6V 12V 2A PWM 1803B US$6.89 US$11.99 View It

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realblades 21/09/2016

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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