In Mexico, where i am, it's not illegal. It's only a tiny project. I would need no more than 10 meters from Tx to Rx. I'm using LM565's for modulation and demodulation. AC power line is 127 V @ 60 Hz :roll:
I had a quick look at the LM565 data sheet and the maximum operating frequency is about 500kHz.
What you need is a high-pass filter which will present a low impedance path to your 500khz signal, but a high impedance to the 60hz mains.
Other things to consider:
Any wideband noise on the mains will interfere with your signal and you will get a high error rate or it wont work at all.
Safety. You need to consider the components connecting the circuit to the mains, they need to be rated for mains voltage and provide reliable isolation. An HF transformer would be a very good idea.
Must you use the mains? Is it not possible to run a separate cable?
Any wideband noise on the mains will interfere with your signal...
You need to consider the components connecting the circuit to the mains, they need to be rated for mains voltage and provide reliable isolation. An HF transformer would be a very good idea.
Must you use the mains? Is it not possible to run a separate cable?
JimB
google .. Circuit cellar...
they were working on a HCS home control system.. that used transmission of info over the powerline...
maybe you could convert the interface to fit your needs...