28 Feb '14, 3pm

Can’t Stand Your Noisy Fan? Here’s a Plan, Man - #arduino

Can’t Stand Your Noisy Fan? Here’s a Plan, Man - #arduino

[Brian] adores his GW Instek GPC-1850D power supply, but it’s annoyingly loud and disruptive to his audio projects. The thing works great, so he decided to regulate the fan’s speed based on usage level to save his sanity. Once [Brian] got under the hood, he found that it actually has four separate heatsinks: one for the bridge rectifiers and one for each power transistor on the three output channels. The heatsinks are electrically and thermally isolated from each other and change temperature based on the channel being used. [Brian] and his associates had several Microchip MCP9803 temperature sensors kicking around the lab from previous projects, so they put one on each heatsink. The great thing about these is their address selection pins which let all four of them sit together on the I²C bus to Arduinoville. Each sensor is insulated and clamped to its heatsink with a piece...

Full article: http://hackaday.com/2014/02/28/cant-stand-your-noisy-fan-...

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