ULN2803 Interface Board

Description

This board with 24x52mm dimensions should be used as interface board for relays, stepper motor ...

It is based on an 8 darlingtons open collector ULN2803, two connectors 5 points allow to interface directly with stepper motor like BYJ48 :
8 leds indicate the output state.
- voltage for ULN2803 command : 2.4V min, 2.7K input impedance.
- Output voltage max : 50V.
- Output current max : 500mA.

Summary

Download here the schematic on PDF format

Bill of material

Top and bottom view Ref Description Fabricant / référence R48..R55 Resistor 1KR 5% 0603 All brands C23 Capacitor 100nF 50V X7R 0603 All brands D11 .. D18 led through hole 3mm green All brands connectors 5 pts TE Connectivity 5-103669-4 or equivalent

PCB

The board dimensions are 25x52mm, as the PCB prototype standard dimensions are 100x100mm, it contains 2 boards.

So you have to cut the PCB on the red line.

Download here the manufacturing files

Assembly

Top view

Bottom view

Dimensions

Download here the top view of a board in PDF format     
Download here the bottom view of a board in PDF format     
Download here the dimensions of the board     

Here is the 3D model of the board to check the mechanical integration on your design :

Download here the step file