Hi guys, did you ever resolve this? I'm going through a similar issue. Thinking of running 24V to my 6HC and 48V to the expansion board (3HC). Will this work? New topic posted here:

https://forum.duet3d.com/topic/36953/duet6hc-24v-and-48v-psu-s-for-different-components/8?_=1731730867239

Thanks 🙂

@gloomyandy Yes. I get it only once, when I turn the PSU off, which I expected.
It's not a big deal, just a minor annoyance.
I just wish to keep my logs clean. 😉

@jay_s_uk I had success with your proposition, thank you !

@phaedrux thanks much appreciated

@bonjipoo you can use the PNP, you just need more three resistors for each, two for the divider and one pull down.

if switching to NPN is simpler then go for it, but PNP will work

@grudairian, increasing voltage from 12V to 14V will increase heater power by 36%. So definitely worth trying if bed heating is too slow. Remember to re-run heater tuning on both hot end and bed.

Sorry for reopening this again - however with the Revo Micro and it's 5V heatsink fan coming up - is that 5V fan okay to use with the provided buck converter from the HF output on the Smart Effector?

Skimming through this thread again - I'd say no - correct?

What are my options?
(apart from finding a (probably impossible to source) 12V/24V 20x20 fan with enough CFM and pressure..)

Do I need to run the full length of 1m wire directly to my Duet Wifi?

May we get lucky and just stick a standard V6 30mm duct with a 30mm fan on it..?