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Step 4Soldering.
Since we are only using one stepper motor and the uln2003 chip has 7 outputs, we will use every other pin to make soldering easier or you can follow the schematic below. Since the stepper motor required 12 volts you make to make an adapter to attach to one of the drive power cables +12 volt line. The ground from the computer will have to be attached also to the common ground point. Do not attach +12 volts to ground!!!!!!!
Note :
Some chips have eight outputs. You probably only need to ground to pin 8 only (on 16 pin chips). Common (pin 9 on 16 pin chips) goes to +12 volts (9 and 10 respectively on the 18 pin chips). Does also not hurt to use a socket so you do not have to solder directly to the pins of the chip than to take a chance on ruining the chip. Please use a breadboard first before doing any soldering.
uln2003 = nte2013 = 7 inputs/outputs
uln2803 = nte2018 = 8 inputs/outputs
Note :
Some chips have eight outputs. You probably only need to ground to pin 8 only (on 16 pin chips). Common (pin 9 on 16 pin chips) goes to +12 volts (9 and 10 respectively on the 18 pin chips). Does also not hurt to use a socket so you do not have to solder directly to the pins of the chip than to take a chance on ruining the chip. Please use a breadboard first before doing any soldering.
uln2003 = nte2013 = 7 inputs/outputs
uln2803 = nte2018 = 8 inputs/outputs
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