ET-MD10
ULN2803 8-Channel Sink Driver
Eight 500 mA Darlington outputs with flyback diodes
AED 12.00
Out of stockOverview
Eight 500 mA Darlington outputs with flyback diodes
The ET-MD10 is built around the ULN2803A — 8 Darlington sinks, 500mA per channel, 50V, built-in flyback diodes to COM. It runs from V+ up to 40V on this board (50V IC, 50V caps, headroom for spikes).
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- 28BYJ-48 unipolar steppers
- Banks of relays and solenoids
- 12 V LED indicators
Key features
What makes it different
Driver
ULN2803A: 8 Darlington sinks, 500mA per channel, 50V, built-in flyback diodes to COM
Inputs
5V TTL / CMOS; 3.3V logic works for lighter loads (check the datasheet curve)
Load
Unipolar steppers (28BYJ-48), relays, solenoids, LED strips; ≤ 1.5A total package limit
Supply
V+ up to 40V on this board (50V IC, 50V caps, headroom for spikes)
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Driver | ULN2803A: 8 Darlington sinks, 500mA per channel, 50V, built-in flyback diodes to COM |
|---|---|
| Inputs | 5V TTL / CMOS; 3.3V logic works for lighter loads (check the datasheet curve) |
| Load | Unipolar steppers (28BYJ-48), relays, solenoids, LED strips; ≤ 1.5A total package limit |
| Supply | V+ up to 40V on this board (50V IC, 50V caps, headroom for spikes) |
| Size | 38.1 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 9-pin 2.54 mm header · Screw terminal 2P 5.0mm 17A (THT) — Load supply V+ / GND |
| Main IC | ULN2803AD (LCSC C481684) |
| Revision | Rev A |
Performance
Output current
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | Ground | Ground |
| 2 | IN1 | Signal | High = OUT sinks |
| 3 | IN2 | Signal | IN2 |
| 4 | IN3 | Signal | IN3 |
| 5 | IN4 | Signal | IN4 |
| 6 | IN5 | Signal | IN5 |
| 7 | IN6 | Signal | IN6 |
| 8 | IN7 | Signal | IN7 |
| 9 | IN8 | Signal | IN8 |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-MD10 ULN2803 8-Channel Sink Driver (assembled)
- 1 × 9-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: GND, IN1, IN2, IN3, IN4, IN5
Compare
Which stepper or BLDC driver?
| ULN2803 8-Channel Sink Driver (this board)This board | ET-MD04 TMC2209 Silent Stepper Driver | ET-MD09 DRV8313 BLDC / Gimbal Driver | ET-MD01 DRV8833 Dual Motor Driver | |
|---|---|---|---|---|
| What it does | Eight 500 mA Darlington outputs with flyback diodes | Whisper-quiet stepper driver, 2 A RMS, STEP/DIR plus UART | Three-phase brushless driver for SimpleFOC, 8–30 V | Two DC motors or one stepper, 2.7–10.8 V, 1.5 A per channel |
| Interface | 5V TTL / CMOS; 3.3V logic works for lighter loads… | STEP/DIR/EN plus single-wire UART for current,… | 3 × PWM + 3 × enable, 3.3V and 5V logic; works… | — |
| Best for | 28BYJ-48 unipolar steppers | 3D printers and CNC axes | Gimbal and camera stabilisers | Small robots and rovers |
| Price | 12 AED | 22 AED | 39 AED | 15 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.