Difference between revisions of "Reprap StepStick"

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Revision as of 08:30, 3 November 2014

Overview

Im130622001 1.jpg

This is an Allegro A4983 / A4988 x4 breakout board for Sanguinololu. It can be snapped apart at the score in case of Allegro failure, and replaced with another or a Pololu. Snap all 4 apart and get a pin-compatible clones for use on boards like RAMPS or Gen7.

Now this is not for the iron wielding solderer. All parts are SMT, and somewhat small - there are some 0402 sized packages. Not to mention the Allegro's thermal pad - a solder pad on the bottom of the chip - can't be soldered without an iron of magic. Go shoppingReprap StepStick

Open Source Files

Gerber file

Schematic

IM130622001 schematic.png

BOM

Item Package Value Value Tolerance Voltage Position Note
Capacitor 402 0.1uf 10% 16V C1, C2, C5, C6 16V capacitor for 12V maximum voltage; use higher voltage capacitors for higher voltage applications, max 35V
Capacitor 402 0.22uf 10% 16V C4, C7 16V capacitor for 12V maximum voltage; use higher voltage capacitors for higher voltage applications, max 35V
Capacitor 1206 4.7uf 10% 16V C3 16V capacitor for 12V maximum voltage; use higher voltage capacitors for higher voltage applications, max 35V
Motor driver chip QNF IC1 Allegro A4988
Resistor 805 0.2ohm 0.25W 1% S1,S2
Resistor 402 10k 10% R4
Resistor 402 20k 10% R1
Resistor 402 100k 10% R2, R3
Trimpot 3mm 10k T1