Re: Simple data bus over DC Power Wires

From: Roman Ziak (roman_at_nospam.com)
Date: 06/21/04

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    Date: Mon, 21 Jun 2004 13:06:21 -0400

    "Ken Smith" <kensmith@violet.rahul.net> wrote in message
    news:cb2gfr$at0$1@blue.rahul.net...

    > You want cheap:
    >
    >
    > L1
    > DC source ----))))))))----------------------- To others
    > or load ! !
    > \ R1 --- C1
    > / ---
    > \ !
    > ! R4 / R2
    > ! -/\/\/--- \
    > !--------------! ! ! ! / R3
    > ! Micro TXD!---!!- ! /+!------/\/\/-- Vcc/2
    > ! ! C2 ! / !
    > ! RXD!------------ ! U1
    > !--------------! \ !
    > \-!---- Vcc/2
    >

    what would be the disadvantage of removing U1 and all connected parts on
    receiving side and connecting C1 directly to RXD grounded through input
    impedance resistor ? Now that's inexpensive :)

    As for the protection of RXD from spikes, I would consider the built-in
    clamp diodes (some microcontrollers have them) together with R2.

    Roman

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