I'm no electrical engineer, but I was trying to figure out if the 11A rail of the RAMPS board could be powered with 24 volts instead of 12 so that I could use a beefier heater. I'm building a delta printer, and the heatbed is going to be a circle about 280mm in diameter. I found a kaptan heater at Trinity Labs that would be large enough, but it runs on 24v.
I looked at the RAMPS circuit diagram, and the 11A rail goes to the D10 terminal block and that's it. Obviously the current would also flow through the MOSFET and a couple of other passive components, so I'm not sure if I'd blow something by doing this.
Alternatively, I could use the RAMPS to operate a sufficiently rated relay which would then switch the bed on and off. I figure the relay would be good enough since the bed uses the band bang approach; I don't see the LED for the bed flashing like I do the one for the hot end.
I looked at the RAMPS circuit diagram, and the 11A rail goes to the D10 terminal block and that's it. Obviously the current would also flow through the MOSFET and a couple of other passive components, so I'm not sure if I'd blow something by doing this.
Alternatively, I could use the RAMPS to operate a sufficiently rated relay which would then switch the bed on and off. I figure the relay would be good enough since the bed uses the band bang approach; I don't see the LED for the bed flashing like I do the one for the hot end.