Hi Guys
I'm building a 400x400x400 machine and for the heatbed at the moment I'm powering it by using 4 little heaters connected on mains. The bed only reaches 56 degrees (IR sensor) and so far after over 100 prints in PLA I have not had any curling or detaching so that's great, however I need it to be controlled by the Melzi really and a 300x300 silicone heat pad would be sufficient to spread I think. They draw about 12v and 20amps:
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www.amazon.com]
I'm struggling to find out what the max draw I can take from the Melzi board would be. I'd prefer not to have a second PSU and a relay board if possible, although I have already specced out that option. I'm trying to keep costs to a minimum.
Anyone know this information ?
Thanks
Adam