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Einsy Rambo 5v to 12v fan

Posted by andreas.ewt 
Einsy Rambo 5v to 12v fan
September 01, 2018 07:03PM
I'm building my own Prusa i3 Mk3 and as many Einsy Rambo users, i'm having some trouble finding 5vdc fans, so i'm gonna make a small circuit to drive the 12v fans, looks like no one did this yet.
But here comes the first problem: i'm a mechanical engineer and my electronic skills and balls aren't bit enough to try on a brand new Einsy Rambo.
My idea comes from the ADM1028 datasheet as you can see here:

I have been looking the Einsy schematics and for me it looks like the fan's uses a simple pwm circuit control, the same used for pcs to drive 3 wire fans (fans without pwm wire/4 wires)
I think this idea is possible using a power regulator to drop the 24v power source to drive the 12v fans.

These are the fans i'm gonna use: "412" and "RLF 35-8/12 N", both made by ebm-pabst
open | download - DC-axial-fan-412-ENU.pdf (428.9 KB)
open | download - DC-centrifugal-fan-RLF35812N-ENU.pdf (459.6 KB)
Re: Einsy Rambo 5v to 12v fan
May 29, 2020 12:21AM
Did it work?
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