In the process of upgrading my Cupcake with a stepstruder, I built a stepper motor driver 2.3 on a stripboard.
After many hours of soldering, my testing showed that I made a mistake somwhere. Unfortunately I don't really have the skills to debug an electronic circuit. Of course I examined the board carefully for any shorts or otherwise wrong connections.
During construction I tested the power circuit by oneself and it worked fine: The power led did light up and I got a steady 5V.
The finished circuit however doesn't work as expected: The power led flashes in short bursts at a frequency of about 1 to 2 Hz. The A3982-IC gets a little bit warm but not really hot. Otherwise, nothing happens, regardless what I do (connect a stepper motor, set ENABLE, STEP or DIR to low/high, adjusting the potentiometer). Led2-5 only turn on when I turn the motor by hand. If I unplug the chip (it's mounted in a socket), the led stays on but the 7805-chip gets relly hot.
I'm at my wits' end here, I really checked everything carefully but apart from wrong connections I don't know what to look for (eg. between which points which voltage/resistance should be read, …). I may have already burned the A3982 as I did connect its VDD to 12V instead of 5V once.
I exactly replicated the schematic from thingiverse, the only changes are a 5K poti (and a 1.2K resistor R6) and 1 Ohm instead of 0.25 for R3 and R16.
Any help from you electronic-wizards out there is greatly appreciated :)
Cheers, iliis
