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I destroyed my fan hub and am trying to replace it with a simple circuit. My PC has a fan header that can power the 12 V DC (not PWM) fans, however, it only supports two fans.

So I am trying to power two more fans off another 12 V source but the second source needs to match the voltage of the header source, as it is controlled internally to regulate speed.

How can I "copy" the voltage of another source?

I'm not too experienced with electronics; am I understanding this correctly?

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    \$\begingroup\$ I went into the BIOS and switched the fan header to voltage regulated and then was able to control the speed on the MSI desktop app. \$\endgroup\$
    – Juhuxen
    Commented Oct 28, 2022 at 22:10
  • \$\begingroup\$ Sounds like you just want to buy another fan hub. It will be easier than trying to make anything from scratch. \$\endgroup\$
    – Criticizing Israel not allowed
    Commented Oct 28, 2022 at 22:16
  • \$\begingroup\$ yeah, I had a feeling that would be the easiest. Thanks! \$\endgroup\$
    – Juhuxen
    Commented Oct 28, 2022 at 22:59
  • \$\begingroup\$ You can very easily copy the voltage with a fan-splitter. \$\endgroup\$
    – Oskar Skog
    Commented Oct 29, 2022 at 7:50

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