Question PWM to analog voltage

Barney-

Honorable
Aug 3, 2014
42
1
10,545
Hi. Anyone know of an adapter or hub capable of producing a steady(ish) DC voltage from a PWM fan header? I.e. if the PWM header is set to 70%, I want 70% of 12V = 8.4V out on the 3 pin output (can be 2 pin, don't really need the tach).

I've seen ICs/arduino circuits for this, but I don't want the hassle!

FYI, the PWM is from the graphics card, no voltage control 3 pin available.

Thanks