Re: MP3 and M60 MkII impedence match...... - Luis - OTL Asylum

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Re: MP3 and M60 MkII impedence match......

0

In Reply to: Re: MP3 and M60 MkII impedence match...... posted by John Harper on July 21, 2000 at 08:27:59:

>Sorry, but this is nonsense. A signal is balanced as long
>as it has equal excursion in opposite directions either side
>of AC ground, at the same impedance. Using an active
>differential output (diff pair, diff opamp, pair of opamps,
>whatever) is just fine.
You're right... but how do you get *exactly* the same
impedance on both outputs? On integrated circuits, you
can get very close, but with discrete devices, I don't
think so...
>>Check out the whitepapers on
>>http://www.jensen-transformers.com
>
>There couldn't possibly be any bias here, now could there?
Don't you think that you should read the papers before making
that judgement? Specially those that present solutions
whithout coupling transformers...
>With regard to the original question, at RF (VHF+) it is very important
>to have a sink impedance equal to the source impedance, otherwise
>reflections occur and mess up the signal. At audio frequencies
>the only thing that matters is to keep the sink impedance well
>above the source impedance, to avoid frequency-dependent loading.
>If you want to experiment with this, you don't need a xfmr, just
>stick a pair of 300 ohm resistors in series across the input of
>the M60 and ground the middle. If you think it sounds better,
>fair enough.
Same goes for a balanced transmission line... then again, as you
know, it's hard to terminate a transmisson line because of the
inevitable imperfections of the source and receiver...
In the end, it just depends on the performance *you* want...
Luis

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Follow Ups Full Thread

Topic - MP3 and M60 MkII impedence match...... - tubeglow 08:37:29 07/19/00 (10)

Re: MP3 and M60 MkII impedence match...... - Luis 17:23:14 07/20/00 (6)

Re: MP3 and M60 MkII impedence match...... - mark 19:05:33 07/20/00 (5)

Re: MP3 and M60 MkII impedence match...... - Luis 07:53:13 07/21/00 (4)

Re: MP3 and M60 MkII impedence match...... - John Harper 08:27:59 07/21/00 (3)

Re: MP3 and M60 MkII impedence match...... - Luis 10:34:05 07/21/00 (2)

Re: MP3 and M60 MkII impedence match...... - John Harper 04:00:48 07/22/00 (1)

Re: MP3 and M60 MkII impedence match...... - Luis 19:21:09 07/22/00 (0)

Re: MP3 and M60 MkII impedence match...... - mark 10:40:30 07/19/00 (2)

Isn't M60 hi imp. input???..even balanced??end - tubeglow 11:19:55 07/19/00 (1)

Re: Isn't M60 hi imp. input???..even balanced??end - mark 11:25:53 07/19/00 (0)

Follow Ups

Re: MP3 and M60 MkII impedence match...... - Luis 10:34:05 07/21/00 (2)

Re: MP3 and M60 MkII impedence match...... - John Harper 04:00:48 07/22/00 (1)

Re: MP3 and M60 MkII impedence match...... - Luis 19:21:09 07/22/00 (0)

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