Wiring fan on melzi

Discussion in 'General' started by someoneonly, Jun 24, 2015.

  1. someoneonly

    someoneonly Member

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    How do I wire the extruder fan on melzi ? the wiki says it should be on all the time but I cant possible connect it directly to my 12V 17A supply right ?
     
  2. elmoret

    elmoret Administrator

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    Yes, you can connect it directly to your power supply.
     
  3. someoneonly

    someoneonly Member

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    Do I need to connect any resistors ? Im afraid the 17A current will spoil the fan.
     
  4. elmoret

    elmoret Administrator

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    No, devices only draw the current they need. Your nightlight is connected to a 15 amp supply, but it doesn't shine like a floodlight, does it?
     
  5. Joules

    Joules Member

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    200w super conducting cooling fan.... WoW

    Sorry just kidding. All components have internal resistance that limits their current. In the case of your fan, it may indicate the current that it will draw from your supply. If you are playing with electrics and electronics it would be worth at least watching some online videos about basic electronics AND learning about insulation and circuit protection (fuses) you don't need a fuse for your fan, but it gives you a better understanding of why and how things should be done. Be careful even low voltages can cause fires.
     

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