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Simple dual channel PWM Arduino fan speed controller shield You can download the pcb an sch (made with expresspcb) from my website (download section): http://www.apcc.tk
Part list: - 3.5cm x 6cm single sided PCB - 2pcs BD139 Power transistor - 2pcs N4001 diode - 1pcs LTV 826 2 channel Optocoupler - 2pcs 10K ohm resistor - 2pcs 220 ohm 0.5w ...
With this simple arduino shield also you can driver 3 watt power leds. Read more about this project on my DIY web site: PWM Arduino
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