ikalogic
Member
I really hate that too and it seems that Google Domain filter won't remove them from the list either. Someone is being paid.
The reason these work well on the 50/60Hz AC line is that the impedance of the power line is relatively high at higher frequencies so it is fairly easy to superimpose a carrier on the AC line.
Compare this to the 12V DC bus of a car where most of the electronics have a capacitor across the DC input which presents a low impedance path to ground for any carrier you try to superimpose.
As I alluded to, and dknguyen stated, the best way is something like this:
Thanks a lot for taking the time...
can you tell me what are those triangles in your schematic? are those buffers...? i don't quite understand the part where 12VDC is mixed with data.. Also shoudnt we use a High pass filter instead of the LPF?
thx again.