Re: gEDA-user: OT: DC power feed on xDSL circuits

[John Griessen <john@xxxxxxxxxxxxxx>]

Michael Sokolov wrote:
> Hello fellow gEDA users,

 looks like
> this (ASCII art):
>
> *-------------------3 | 3--------------------+
> 		    3 | 3                    |
>                     3 |	3--+                 |
> 		    3 |    |		     +-----
> To transceiver IC   3 |    = (1 uF or so)	    To copper loop
>                     3 |    |		     +-----
> 		    3 | 3--+		     |
> 	            3 | 3		     |
> *-------------------3 | 3--------------------+

> 1. What is the benefit from having the DC blocking capacitor across the
>    centre split in the transformer's primary winding?  What harm would
>    there be if someone took that capacitor off the BOM and simply
>    shorted those pins on the transformer to make the primary winding
>    effectively non-split?

If you shorted where the cap is, The windings on that side would flow DC
for no purposeful utility, i.e. power waste.

The above is NOT a DC passing circuit.  If power flows through it, it does so by oscillations.

John
--
Ecosensory   Austin TX


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