Multiple power supplies 12/24
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@clearlynotstef I think for fans and other low power devices using a buck converter is fine. Everything is switched on the negative side. You could then replace them with 24v equivalents whenever you want. I wouldn't run heaters through a converter though. You'd be much better off replacing those with 24v ones.
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Exactly what @gtj0 said.
Swap 12V PSU to 24V, add buck for fans that feeds the + to the fans, and the fan - is to the duet to be switched... and replace hot end heaters with 24V.
What about your bed?
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@Danal Bed is 120v on SR. Is there a reason to use a buck converter when I already will have a spare 12v power supply? Couldn't I just add a 24v to the duet for motors, and connect the + fans to the current 12v power supply for power directly? then just the ground to the board for pwm/switching?
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@clearlynotstef Sure. You're the one that mentioned the converters.
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While I believe that would work... inexpensive power supplies are notoriously weird about their ground (internally). May or may not be tied to earth ground, may or may not be a true zero potential, etc.
Personally, I'd be MUCH more comfortable with the converters on the fans.
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Alright so let's say I go buck converters for the fans then, new carts for the hotend heaters, bed is SSR so nothing there, and by the time I'm done there will likely be 7 nema 17s, one of which is a little baby pancake on the extruder. 360 watt should do?
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How many hot ends on at once?
Delta / Kossel printer fanatic
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https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V for buck converter example.
https://duet3d.dozuki.com/Wiki/Choosing_the_power_supply for some guidance on wattage requirements.
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@Danal Just one, swappable smart effectors, one with a .4 v6 and the other with a volcano with a .8 (and a bigger heater).
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Hi there.
i did what 's written in the article posted from @Phaedrux ...the only difference is that my 12V p.s. is coming from a dedicated 12v power supply. (i don't this this is matter)
I followed the instruction but my fan doesn't work. it works only when i connect internal 5V by jumper. (obviously less then full speed).
anyone has an ideas?thanks
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There are 3 options in that article. Which one did you use?
And can you post photos of the wiring of the buck converter?
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@Danal , I used the article only to have the information for connection of 12V in the middle pin of voltage selection for fan. (V_FAN_A)
I didn't used a buck convertor, but a power supply already used to other equipment.
I connected the DC 12V+ from power supply following the indication of attached picture.
My 12V p.s. is directly supplied from 220 V .
I dont think that the 12 V to supply the fan has to be derivated from the duet board....but i'm not sure....
the result is that my fan doesn't work in this configuration.Bye
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What you show for the converter should work. Assuming the screw was adjusted so it outputs 12V
Edit: Board wiring looks correct.
Double check that converter is outputting 12V
