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I just found a device that does what I'm looking for
https://www.sparkfun.com/commerce/product_info.php?products_id=9185
I'd like to design a simpler version of this circuit.
I have a system with a master and multiple slaves. I currently have separate power and communication wires. (I'm using cat 5 cables). I would like to only have 2 wires and run the communications on the power wires using FSK.
I'm thinking of pulling the signal off with a capacitor and then...
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