Attachment 3870
OK guys here is the finial PCB i will send out to the fab house
opto-iso + 500ma PNP driver for main mosfets makes sure both are in full saturation
made a foot print for the XT60's and put them on board
made it as simple as i can power on one end, hotbed on other..
if anyone is interested in whats really just a ground switch with a crazy low volt drop just PM me
i can safely say this will take 60 amps all day without fail.
at 60amps total resistance comes up a tad to .00091ohms (.052vd) or about 3.5watts lost (mosfets rated for 200watts dissipation each)
this the size of the board and traces i think 60amps is a safe rating with spikes up to 100 amps the
board and connectors are really more of the weak point. i expect the copper to go long before the mosfets
i will Tin the power traces (silver solder) to help with power limits.
Attachment 3872
official price is 20$ shipped and includes 6feet of 10ga silicone ultra flex cable
the two things will increase hotbed power by
20% over 14ga speaker wire and stock relay
16% over 12ga and stock relay
37% over 14ga wire and ramps built in mosfet (yes ramps really eats that much power)