ET-C08
4-Channel Opto-Isolated Input
Read 12–24 V machine signals safely at 3.3/5 V
AED 11.00
Out of stockOverview
Read 12–24 V machine signals safely at 3.3/5 V
The ET-C08 is built around the 4 × PC817, 5kVrms; field side and logic side share no ground.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- PLC-style sensors and limit switches
- 24 V machine signals
- Door and alarm contacts
Key features
What makes it different
Isolation
4 × PC817, 5kVrms; field side and logic side share no ground
Inputs
12–24V DC (on ≥ 9V, off ≤ 3V), ~2.4mA at 24V; reverse-polarity safe
Outputs
Open-collector with 10k pull-ups: active-low, 3.3V or 5V logic
Use
PLC-style sensors, limit switches, 24V machine signals, door contacts
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
| Isolation | 4 × PC817, 5kVrms; field side and logic side share no ground |
|---|---|
| Inputs | 12–24V DC (on ≥ 9V, off ≤ 3V), ~2.4mA at 24V; reverse-polarity safe |
| Outputs | Open-collector with 10k pull-ups: active-low, 3.3V or 5V logic |
| Use | PLC-style sensors, limit switches, 24V machine signals, door contacts |
| Size | 50.8 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 6-pin 2.54 mm header |
| Main IC | PC817X3CSP9F (LCSC C41807) |
| Revision | Rev A |
Performance
Input current
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | Power | Logic 3.3–5V |
| 2 | GND | Ground | Logic ground |
| 3 | OUT1 | Output | Low = input 1 active |
| 4 | OUT2 | Signal | OUT2 |
| 5 | OUT3 | Signal | OUT3 |
| 6 | OUT4 | Signal | OUT4 |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C08 4-Channel Opto-Isolated Input (assembled)
- 1 × 6-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VCC, GND, OUT1, OUT2, OUT3, OUT4
Compare
Which isolation board?
| 4-Channel Opto-Isolated Input (this board)This board | ET-C07 Isolated I²C Bridge | |
|---|---|---|
| What it does | Read 12–24 V machine signals safely at 3.3/5 V | 2.5 kV isolation between your MCU and an I²C device |
| Interface | 12–24V DC (on ≥ 9V, off ≤ 3V), ~2.4mA at 24V;… | — |
| Best for | PLC-style sensors and limit switches | Sensors on motors and drives |
| Price | 11 AED | 25 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.