12 and 24v duet?
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Duet Wi-Fi 2, delta, smart effector. Currently everything is 12v, bed heater is AC 115V/SSR. Many fans and whatnot are all set up nice on 12v. Turns out me new hotend is looking for 24v
. I have an unused 24v power supply, just never used it because 12 did the trick and I like my fans. What's the easiest way to use two power supplies here? I could use 24v and put buck converters between the duet and the smart effector for the 4 fan wires I suppose, but the only buck converters I have on hand are crap tiny SMD boards and I'd hate to introduce another cheap component to break and disable my hotend fan ruining prints! Is there any way to feed a trace on the duet that runs only to the fans from a 12v power supply and the rest of the duet from 24? How does electricity work anyway, if I hardwire the fan+ to a 12v+ and hook the fan- to the duet would it explode, work, or get 24v anyway?Any ideas on dual power supply wiring schemes or should I just start trying to find new fans I like as much as my current ones?
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Yes you can feed a 12v source into the Duet for just the fans.
Your stepper motors will work better with 24v as well.
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@clearlynotstef said in 12 and 24v duet?:
but the only buck converters I have on hand are crap tiny SMD boards
If you want to have the 12V from a 24-12VDC, buck converter, I have good experience with this kind. From the outside, they seems to be well built. https://www.amazon.com/gp/product/B00J3MHRNO
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@phaedrux it took me like 3 hours to remember the fans not my only issue
all my other hotends are 12v heaters 
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@clearlynotstef Replacement heater cartridges are relatively cheap though (-;
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@clearlynotstef said in 12 and 24v duet?:
@phaedrux it took me like 3 hours to remember the fans not my only issue all my other hotends are 12v heaters
You can also do the dual voltage trick for the 12V nozzle heater but oliof's suggestion is better.
24V supply for steppers is the standard now so it's a good move IMO.
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@phaedrux 24v it is... I think the one I have is 350W (14.6 amp). That should do the trick?
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@phaedrux also, replacement heaters are pricy! What happens if i pid tune a 12v heater with 24v power supply? Wouldn't it just cycle pwm faster to keep it at the set temp? Isn't there a parameter I can adjust to use what I've got already?
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@clearlynotstef said in 12 and 24v duet?:
@phaedrux also, replacement heaters are pricy! What happens if i pid tune a 12v heater with 24v power supply? Wouldn't it just cycle pwm faster to keep it at the set temp? Isn't there a parameter I can adjust to use what I've got already?
No, that is a very unsafe thing to do.
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@clearlynotstef, if your MOSFET will get shorted, the heater will run on 24V at four time it's power, like 160W.
What kind of heaters are you using? Do they have non standard dimensions?