NoticeDifference between revisions of "Reprap StepStick"
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Revision as of 08:30, 3 November 2014
Overview
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
- Reference: http://reprap.org/wiki/StepStick
Gerber file
- Eagle files here: https://github.com/mosfet/StepStick
- How to Export Gerber files from Eagle
Schematic
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 |
