Cheap Viotec 450 watt ATX PSU from SeeMeCNC No resistor output = 11.86 volts With resistor = 12.13 volts
With Onyx rev 5 bed heating, no resistor = 11.03 v 1 resistor = 11.48 v 2 resitors in paralell = 11.55 v
I used 1 resistor fastened to power supply vent grid holes with M3 screws, so air blows over resitor keeping it cool.
Bed will heat from 25c to 90 c in 13 minutes.
I used the one like above link I had around from another project, but the one from Autozone or O'Reilly works also, just not as nice for mounting and does not not have nice finned aluminum case.
Post by bvandiepenbos on Jun 16, 2014 11:37:07 GMT -5
guessing, but about 20 minutes.
may not help a lot, but I figure every little bit helps. And this is a cheap easy mod. I suspect build quality/output of these cheap power supplies vary.
Post by jimustanguitar on Jun 16, 2014 13:41:25 GMT -5
Plus, on anything super cheap like that (they're only $20 power supplies) they're going to lie on the specs as much as they can get away with so that people still buy them.