Post by thread:Fw: Power line transmission

National Semiconductor had a chip - LM 1893 - for power-line communication, but is now being abandoned by them (see their webpages - sale out until september or so this year). New IC's (for european home automation standard) are SGS-Thomson ST 7537 and Philips TDA 5051 (A). I haven't the right webpages here, but do a search under yahoo or hotbot and you'll find them. Lots of appnotes too and a large story about the facts and problems encountered in using power-line communication by SGS-Thomson.... By the way..... in my opininion it SHOULD be possible to use a PIC + some other hardware (opamp, tuned transformer for coupling to mains, maybe power transistor for transmitting stage) for the same (hmmm... synthesized waveform generation for transmitting; and some digital filter for receiving - maybe some of the new PIC 12C5XX ???? - and using the same PIC for remote DAQ or remote activation of equipment ????), but I haven't had sufficient time up to now to dive into digital-filter theory and the like, so..... Maybe somebody on the list who has done digital waveform synthesis and filtering can give a hint where to find more - ready -to-use - info about these subjects. But perhaps I'm dreaming too much.... Albert Smulders InSAD - Encarnacion, Paraguay spam_OUTinsadTakeThisOuTitacom.com.py

Alberto Smulders <.....insadKILLspam@spam@ITACOM.COM.PY> wrote: |By the way..... in my opininion it SHOULD be possible to use a PIC + some |other hardware (opamp, tuned transformer for coupling to mains, maybe power |transistor for transmitting stage) for the same (hmmm... synthesized |waveform generation for transmitting; and some digital filter for |receiving - maybe some of the new PIC 12C5XX ???? - and using the same PIC |for remote DAQ or remote activation of equipment ????) In "The IBM Personal Computer from the Inside Out" by M.Sargeant III and R.Shoemaker, a system of connecting the PC to the mains and compatible with the BSR X-10 system is described. The principal components of the transmitter are a 555 timer, a 2N222, and an IF transformer. Capacitors are used for powerline isolation. The authors credit Steve Ciarcia's article in Byte Magazine (Vol 5. No. 1) and Jim T. Fulton's letter to the editor of Byte magazine (Volume 5, No. 6) Tom