ET-MD07
2-Channel 5 V Relay Board
Two SPDT relays with active-high 3.3 V / 5 V inputs
AED 12.00
Out of stockOverview
Two SPDT relays with active-high 3.3 V / 5 V inputs
The ET-MD07 is built around the 2 × Songle SRD-05VDC-SL-C, SPDT (NO/COM/NC), 5V coil. It runs from 5V, ~75mA per active relay.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Switching low-voltage pumps, valves and lamps
- Garage-door and gate buttons
- Home-automation contacts
Key features
What makes it different
Relays
2 × Songle SRD-05VDC-SL-C, SPDT (NO/COM/NC), 5V coil
Inputs
Active-high, 3.3V and 5V logic, ~2.6mA per input; NPN driver with flyback diode and LED per channel
Load rating (this board)
Low-voltage loads only: ≤ 30V DC / 5A. Not for mains — the PCB is not certified for mains isolation.
Supply
5V, ~75mA per active relay
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
| Relays | 2 × Songle SRD-05VDC-SL-C, SPDT (NO/COM/NC), 5V coil |
|---|---|
| Inputs | Active-high, 3.3V and 5V logic, ~2.6mA per input; NPN driver with flyback diode and LED per channel |
| Load rating (this board) | Low-voltage loads only: ≤ 30V DC / 5A. Not for mains — the PCB is not certified for mains isolation. |
| Supply | 5V, ~75mA per active relay |
| Size | 50.8 × 38.1 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 4-pin 2.54 mm header |
| Revision | Rev A |
Performance
Power budget
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 5V | Power | Coil supply 5V (150mA with both on) |
| 2 | GND | Ground | Ground |
| 3 | IN1 | Signal | High = relay 1 on (3.3V or 5V) |
| 4 | IN2 | Signal | High = relay 2 on |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-MD07 2-Channel 5 V Relay Board (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: 5V, GND, IN1, IN2
Compare
Which output driver?
| 2-Channel 5 V Relay Board (this board)This board | ET-MD05 PCA9685 16-Channel Servo Driver | ET-MD08 4-Channel MOSFET Driver | ET-MD10 ULN2803 8-Channel Sink Driver | |
|---|---|---|---|---|
| What it does | Two SPDT relays with active-high 3.3 V / 5 V inputs | 16 servos or PWM LEDs from two I²C pins, Qwiic | Four logic-level low-side switches, 3 A each up to 24 V | Eight 500 mA Darlington outputs with flyback diodes |
| Interface | Active-high, 3.3V and 5V logic, ~2.6mA per input;… | I²C up to 1MHz, address 0x40 (6 jumpers → 62… | 3.3V and 5V logic, < 1µA | 5V TTL / CMOS; 3.3V logic works for lighter loads… |
| Best for | Switching low-voltage pumps, valves and lamps | Robot arms and hexapods | LED strips and lighting | 28BYJ-48 unipolar steppers |
| Price | 12 AED | 49 AED | 16 AED | 12 AED |
Downloads
Documents and design files
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