In referance to my PWM controller, that was the problem we found with the first proto type, it wouldnt start several models of fans. This was fixed in the final prototype and in in the production model. The problem was not all fans like PWM stutter voltage some took over 9 volts to get them going then you could throttle them back to around 5 volts. My circuit buffers the PWM spikes so that the signal is alot smoother and the fans will start at lower voltage without the normal PWM stutter.
Just food for thought
Aardil
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