Instructables

PWM Arduino fan speed controller

Picture of PWM Arduino fan speed controller
instruct_arduino-pwm-shield-PCB.jpg
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
 
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Step 1: Part List

Picture of Part List
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 resistor

- 1pcs 1K ohm 0.5w resistor

- 1pcs 3mm Red LED

- 2pcs of 2 wire connector

- 2pcs JST 3-Pin Connector Plug

Step 2: Testing PWM Arduino fan speed controller

Picture of Testing PWM Arduino fan speed controller
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
Ozzie_G10 months ago
Nice little project, minor improvement would be appreciated.
I am sure the PCB works, but in your schematics some crossing lines DO and some DON'T connect.
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