Hello,
I recently got four of the 1201 stepper driver carriers for use in a RepRap. Today I got my breadboard set up to test just one carrier, and when I applied power to the setup, my (separate) 5V reg shut down for overcurrent.
I had the Rep Rap mother board connected for step, dir, enable, and I had the stepper connected to the motor outputs. The motor was jittering but not really doing anything else. Turning the 1201’s pot didn’t seem to make a difference.
Tracing the VDD and GND showed I have a 1.5 ohm short between VDD and GND on the carrier board. This exists even when the carrier is entirely disconnected from the circuit. I dropped in one of the other carriers without changing anything on the breadboard and it works fine.
Is this carrier screwed? Could it have come that way, or did I do something to cause it? Have you folks seen this sort of thing before? I looked at it under magnification but I can’t see anything amiss.
Thanks!
toomanyplugs