Don Klipstein’s LED Web Site: Tons of authoritative information about LED manufacturing, characteristics, etc.

Stepper / CNC Project

Allegro A3977, Idle noise Help: Discussion about PWM noise on steppers, advice on separate logic and power grounds

Tero’s Project Corner: Student-produced A3977 board (very attractive!)


Techwando on Gold Phoenix for small PCB orders

Drill Bit City: Resharpened PCB drill bits

PreciseBIT Scoring / Engraving Bits: Trace isolation milling bits

Drill bit size chart (Wikipedia)

Drill bit size chart (Drill Bit City)


Lantronix XPort: RJ-45-sized server

gridconnect: XPort retailer

Materials / Construction

Working and Gluing Plexiglas