Monthly Archive: February 2011

Feb 08 2011

PWM Fan controllers using the 555 timer IC

Here I made 3 slightly different PWM fan controllers based on the 555 timer for controlling a large server fan – Delta FFB1212EHE, 3A peak, 2A normal load, other features of these controllers are to boost the fan on to 100% for the first few seconds of receiving power and a ‘turbo’ button to set …

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