22 Jun 2006 Nic   » (Master)

June 21st, 2006

I had my last finals today, and as of this afternoon at 12:00 school's out for the summer! I made my H-bridge circuit on a breadboard to test it with a small motor. I had to make some small modifications to get the circuit to work, but eventually it did. I designed the circuit to be fool-proof but about a minute after I got the circuit working.. it went up in smoke. Following the trail of melted wires, I deduced that both the left side MOSFETs had been turned on at the same time. I'm still not sure how this is possible.. maybe a component's lead touched another's. Anyway, I melted a bunch of stuff, so that's too bad. I think tomorrow I'll remake the circuit more carefully and with normal transistors.. and if it melts again I'll know the problem is with the circuit, not with an accidental short.

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