This is not exactly about a PIC, but I know that some of you out there have done some carrier current and/or X-10 stuff, so maybe you can help me. I have some carrier current intercoms that work quite well as long as they are on the same half of the 240V circuit in my house (BTW, I live in Canada, 120V 60Hz, 240V feed to the house). The problem is that many of the AC outlets I want to use are not on the same side of the wiring. I know that a similar problem shows up with X-10, and I believe it is solved by placing a small value capacitor across the two halves of the 240V line, but I don't know exactly what type of cap, or what size to use. The intercoms use one of 3 carrier frequencies (FM modulation, 1KHz deviation) at 200KHz, 230KHz or 260KHz. Can anyone suggest a suitable device to link the two halves of the circuit at carrier frequencies, tell me exactly where to put it (no cracks pleez), and alert me of anything I should look out for (I have done quite a bit of AC wiring in my 40 years - tomorrow - so I'm not a neophyte in that area). TIA - Martin. PS. maybe you should reply directly to me via email, this is quite off-topic Martin R. Green elimar@NOSPAMbigfoot.com To reply, remove the NOSPAM from the return address. Stamp out SPAM everywhere!!!