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    Using Mos Module to run different FAN Voltages / Berd Air

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    • kuhnikuehnastundefined
      kuhnikuehnast
      last edited by

      Hi there!
      I would like to try using a Mos Module https://hobbycomponents.com/motor-drivers/661-irf520-mosfet-driver-module (usually used for Arduinos) to run a Berd Air pump (24 V) simultaneously with a 12 V Noctua Fan. Therefore I got the idea:

      1. Use the 5 V Switch on the duet Board to generate the PWM- Signal
      2. The Fan- Output is Connected to the Mos Module (SIG and GND)
      3. I can power the Mos Module with the Voltage I need and have a additional "fuse" for Current Overload...

      Do you think this will work? I am a little bit afraid of burning my loved Duet Wifi 🙂

      Greetings kuhni

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      • kuhnikuehnastundefined
        kuhnikuehnast
        last edited by

        Really strange... Tried it now:
        If I run the module with 2 PSUs (5V as Signal and 24V as Main), it works perfectly. Also if I run it at the duet with only the signal voltage connected (the LED blinks ones at start). But if I connect the 24V, the Fan runs all the time...? That's really strange! Anybody who know how to solve this?

        This is a link to a circuit layout I found:

        http://forum.hobbycomponents.com/viewtopic.php?t=1872

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        • dc42undefined
          dc42 administrators
          last edited by

          I suggest you use an isolated mosfet switch instead, either a conventional 4-terminal DC-DC SSR such as https://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=450 or https://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288, or a 5-terminal mosfet switch such as https://www.reprap.me/power-expander.html or https://www.ebay.co.uk/itm/3-20V-Mosfet-MOS-Transistor-Trigger-Switch-Driver-Board-PWM-Control-Module-TOUS/302830138710.

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • kuhnikuehnastundefined
            kuhnikuehnast
            last edited by

            Its really strange! I now tried:

            1. https://www.ebay.de/itm/AOI4184-MOSFET-NMOS-40V-50A-Schalter-Modul-Relais-Arduino-Raspberry-Pi-PIC-T17/172401634837?ssPageName=STRK%3AMEBIDX%3AIT&var=471230380981&_trksid=p2057872.m2749.l2649 (Mosfet Board)

            2. https://www.ebay.de/itm/MOSFET-Modul-für-Arduino-LR7843-Optokoppler-Transistor/183404087164?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 (Optokoppler- Mosfet Board)

            Both didn't work... The only Mosfet that worked so far is this "big one" usually used for heated beds...:
            https://www.amazon.de/UEETEK-Drucker-Heizungsregler-Hitzebett-Extruder/dp/B074L1CMYB/ref=sr_1_8?ie=UTF8&qid=1538501325&sr=8-8&keywords=mosfet

            Now I am a littlebit afraid of buying the suggested boards from reprap.me, as they are a littlebit expensive... (https://www.reprap.me/power-expander.html )???

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            • Dougal1957undefined
              Dougal1957
              last edited by Dougal1957

              But I can say that the reprap.me one works I have a couple of them and there fine you do need to solder the connector in place tho guess thats so you have a choice to hardwire if your wish

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