Hi Everyone,
I have a question with regards to Dual Extrusion on the Ramps boards.
I’m thinking to save 1 Wire going to the hotend heaters.
It is possible to have a “common ground” going to the Heater blocks.
ie: 1 Black wire shared between the 2 hotend heaters
1 Red Wire for left heater, and 1 say blue wire to the right heater.
It really means that D9 and D10 would be wired to to share a common ground.
Any advise on this, or is it a bad idea?
To elaborate, most 3D printer power outputs on all the controllers I’ve looked at are pull-down with the high side always hot. To turn on a heater or fan, they “pull” the negative side to ground. You can verify this by using a multimeter to probe the terminals. So you can use a common high side. Wiring common low side will be really confusing at best, dangerous at worst.
@Mark_Rehorst well its 3.3 amps per heater @ 12V thats ok. The standardwires would be fairly enough. But its gotta be common 12V not common ground. There are two n-fets which source to thr ground.