Archive for October, 2011

20th October
written by Todd Harrison

I’m in a pinch and need to convert 120v AC to 12v DC to cool an electric motor. Not having much for supplies on a Sunday I pulled out the whiteboard and my calculator to devise a quick hack to power my 12v DC fan from the 120v AC mains running the electric motor. I needed only three components to create my DC power supply: a light bulb (40W), capacitor (470uF 80v), diode (1N4004) but in the video I used a salvaged diode from an old microwave oven.

In this video I share this simple hack and go into the math just enough so others can calculate the correct size light bulb for such a DC power supply hack if ever needed.

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