Electronics > Projects, Designs, and Technical Stuff
Arduino - Control fqP30N06L N-channel mosfet with 74hc595 shift register?
ledtester:
--- Quote from: kylegp on August 26, 2020, 05:44:13 am ---Yes however if I take everything else off the circuit and measure the HC595 outputs, they're 0V when low. So something happens where the gate is energised still when the mosfet, LED and 12V power are introduced?
--- End quote ---
Just to be sure... are all of the GNDs tied together?
kylegp:
EDIT: Turns out I had several faulty mosfets. Either a bad batch or something was shorting them out. Most of them failed manual operation and in my tester. This was the whole reason for pulling my hair out, faulty mosfets.
Thanks all for the replies. I think it was a bung HC595.
I just soldered up a fresh HC595 with this known good mosfet and my circuit is now working normally. The 12V LED can be turned on and off with the shift register. I can only assume the shift register was bad and accidentally shorted, or there was a poor solder joint on one of the wires which was corrected when I soldered a new HC595. It was working with normal LEDS which is why this whole thing is confusing.
Either way, it seems to work now.
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