Here is list of items that you need building fan speed control circuit. Items are

  • Power connector to get power from PC. We are using 12 volt line to feed the LM317 regulator.
  • 1 Kilo ohm resistor.
  • 100 nf condensator
  • 1 uF condensator
  • 10K trimmer or you may wan to use 10K linear potentiometer
  • piece of VERO board. It might be good idea to cut it exactly to same measure as here to make building easier.
  • one or two set of three connector pins should connect your fan with motherboard connector. Otherwise you may wan to use PC power connector or whatever that connects your fan to the board.
  • Some kind of idea how to attach board to the PC-case
Note that you need to cut right leg away from the trimmer if you plan to use same size of trimmer as I did.We are only using two legs here.
Mark board using permanent marke as here for the cuts we are going to do in the next step.
You can cut the board using sharp hobby knive. But remeber to be extra carefull not to cut too much or your finger.
Here is cut board. Make sure that strip is cut and that cut pieces does not touch parallel strip next to it.

 

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