Thank you for this information. Also a great solution.
Any others to share their builts/experiances :-)
I think I will redesign the whole thing as soon I have time/money instead of possibly fry my current setup. New pad, new PSU.
Good thing: could built a heater case for my LiPo's with the "old" components :-)
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zoev89 73
@Drayson
I am using aluminium clad resistors. They are 2.2 Ohm 50Watt. I have made 2 parallel strings of 3 resistors in series. I use a 200W 24 power supply which I increased to about 26V. This gives me about 200W to my aluminium bed. It heats up slowly since the aluminium is 6mm thick (but it is flat). It takes about 5 min to 60 degrees and 25 minutes to get to 130 degrees (10 degrees loss if you use a glass plate). I would like also to heat it a bit quicker but I would have to buy a bigger power brick. Since it is working and given the fact that it does not heat-up so quickly it is also fairly safe. You can look on my website for fotos and the electronics I used.
http://www.modelbouwensport.nl/3DPrinter/HeatedBuildPlatform.html
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