Motherboard fan speed control - high side or low side switching?

Discussion in 'NZ Computing' started by Squiggle, Aug 21, 2007.

  1. Squiggle

    Squiggle Guest

    Just wondering if anyone here knows whether the variable speed fan
    headers on a PC motherboard are low-side or high-side switched to do the
    PWM for the fan speed?
    I'm guessing its low side switched, and at about 20khz but would be
    grateful if someone with a 'scope could confirm this for me.

    El Chippy
    Squiggle, Aug 21, 2007
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