dc fan control

Discussion in 'General Electronics Chat' started by zr1das, Feb 2, 2010.

  1. zr1das

    Thread Starter New Member

    Oct 22, 2008
    hullo everyone,
    i am looking for a very simple temperature fan control circuit for a 12v dc pc fan with variable speed as heat increases., i believe there are circuits using lm350's?

    many thanks
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    Here is an outline for a temp fan control.Thermister, 2" rod, illustrated measures 2k at 74 deg F & 1 k at about 90 deg F. High temp set with 5K pot to give 12V at pin 1, fan at about 10.7V,; low temp set with 120k [500k pot].
    Last edited: Feb 4, 2010