8 Channel 12V relay board with PC814 optocouplers and transistor drivers

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The 8 Channel 12V relay board is designed for controlling electrical loads through eight separate relay outputs. The board is designed for 12V relay operation and uses PC814 optocouplers between the control inputs and the relay driver circuits.

Each channel uses a PC814 optocoupler to provide galvanic isolation between the control signal and the transistor driver stage. The phototransistor inside the PC814 controls a transistor, which in turn drives the relay coil. This design reduces the need for a direct electrical connection between the external control signal and the relay drive circuit.

A 2200 ohm series resistor is connected before the PC814 input. The PC814 uses an AC input configuration with two antiparallel LEDs, making it suitable for control signals where input polarity may vary. Input 2 can be connected by jumper to either VCC or GND, allowing the input configuration to be adapted to the control system.

The relays are designed for 12V operation and each channel has its own transistor based driver circuit. The board can be used with microcontrollers, PLC systems, automation equipment, Arduino, ESP based systems and other electronic control applications where several electrical loads need to be switched independently.

When connecting a microcontroller, the control voltage and current should be checked to ensure that the PC814 input is driven correctly. The maximum voltage and current ratings of the relay contacts must also be checked against the load being connected.

Facts.
Product name: 8 Channel 12V
Number of channels: 8
Relay voltage: 12 V
Optocoupler: PC814
Optocoupler type: Phototransistor
Optocoupler input: LED
Input resistor: 2200 ohm
Input 1: Control input through 2200 ohm resistor
Input 2: Can be jumpered to VCC or GND
Isolation: Galvanic isolation between control signal and relay driver
Relay driver: Transistor controlled
Relay function: Separate relay for each channel
Number of relays: 8
Control: Separate control input for each channel
Application: Electronic control and automation
Suitable for: Arduino, ESP and other control systems
Relay supply voltage: 12 V
Series resistor per input: 2200 ohm
Optocoupler output: Phototransistor
Control principle: Optocoupler controls transistor which drives relay coil

Included.
1 pc module.

About the product.
Weight: approx 116 gram.
Contact us if you have questions at info@pchbutik.se
Article no: 3793
Remaining stock quantity can be found under the Product details tab.
In our range since: 2026-08-24

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