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Parallel Port 3 Axis CNC Driver, Opto-Isolated, Unipolar Steppers

Step 2Resistors and Diodes

Resistors and Diodes

R1 - R12 are 1kohm 1/4w

R13 - R19 are 10kohm 1/4w

R20 - R25 are ~500 ohm 1/4w

TOG is a 10kohm 1/4w

D1 - D12 are 1n4004 or better

Place all the resistors and solder them in. Diagram Below
TOG is a 10kohm 1/4w resistor, mounted vertically.

Diodes D1 - D12 are next. Save the extra lead clippings for the jumpers.
These clamp the back EMF, protecting the PSU and logic.

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ChromationSystems (www.chromationsystems.com)

Designing electronic creations from microcontrollers, LEDs and anything else I can pull out of a dumpster and make use of. Check my Profile