Power Line Protocols
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Also called Power Line Carrier Communication (PLCC). A "power line" can be any cable that distributes power, including mains (120-240VAC), the +12V from the battery in a car, or the DC power supply rails on embedded circuitry.
An example circuit for the LM1893 from Texas Instruments.
![](/assets/images/lm1893-example-circuit-power-line-comms-texas-instruments-8218446ca5d26e29e04037bb7eef6819.png)