Hello, it's nice to be back! I did this board for a wire-fusing purpose: it ignites rocket engine propellant by fusing a 0.5mm^2 NiCr wire attached to "P+ P-" connectors. Fusing the 25mm wire can require as little as 5A*0.05s to 25A*0.5s(ambient temperature, wire is not uniform, contact resistance..)
B+ and B- are the 13,4V LiPo connectors, F is the +5V arduino signal(supposedly continuous, but makes my UT-61E autorange oscillate like crazy),and GCE are the IGBT
www.irf.com/product-info/datasheets/data/irg4pc50f.pdf pins.
Trouble 1:when tested with a led+resistor it worked only when swapping C and E(?)
![Shocked :o](https://www.eevblog.com/forum/Smileys/default/shocked.gif)
Trouble 2:In the first led test the IGBT stayed on, i figured it was due to the gate insulation coupled with an small capacitance. Adding the 100K bleed resistor to the negative rail seemed to solve it.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
Trouble 3:when testing with the NiCr wire it didn't work
![WTF? :wtf:](https://www.eevblog.com/forum/Smileys/default/wtf2.gif)