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Optocoupler Relay Circuit Diagram
![bjt - Circuit for 12V relay with an optocoupler using 3V3 GPIO](https://i2.wp.com/i.stack.imgur.com/j8Rfw.png)
bjt - Circuit for 12V relay with an optocoupler using 3V3 GPIO
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How to control optocoupler and relay by using microcontroller