What Design to Use? - Page 2

audiohead · 29th March 2006, 06:50 PM

With all due respect, all CD players @ 0dBFS have 1 Vrms output not 2!

EC8010 · 29th March 2006, 06:57 PM

I think you'll find it's 2V. I don't have the "Red Book" standard, but that's the accepted figure and I've measured a number of players that corroborated that number.

SY · 29th March 2006, 06:57 PM

Quote:

Originally posted by audiohead
With all due respect, all CD players @ 0dBFS have 1 Vrms output not 2!

Checking three at random, I find:

Quad 99- 2.4VRMS

Cyrus - 2.1V

Ayre CS-7 - 2.25V

EC8010 · 29th March 2006, 07:00 PM

Oh yes, we shouldn't forget the players that were designed to sound better in AB tests by virtue of being louder.

Miles Prower · 29th March 2006, 08:48 PM

Quote:

Originally posted by Jason Watts
Which of the three designs listed below should produce the best performance. What would be the preferred design?

It depends...

1. Common-cathode stage, fully-bypassed cathode:

Highest voltage gain, highest THD, and lowest possible input Vp-p.

2. Common-cathode stage, unbypassed cathode:

Trades off voltage gain for improved THD, and more input Vp-p.

3. Single-stage inverting feedback amplifier:

Trades off lots of voltage gain for very low gains and enhanced distortion performance. Most often used as a "plate follower" to invert a signal at or close to unity gain. (Cathode followers produce an in phase signal at close to unity gain.

As for your situation, what do you need so far as voltage gain, distortion performance, input Vp-p? Decide that, and you have your answer.

lndm · 29th March 2006, 10:08 PM

And then there's the swamped common cathode stage (partially bypassed). Using an unbypassed cathode resistance of 1/gm, on its own or in combo with some bypassed resistance or an LED, will linearise the transfer curve.

About Zo, it should be low compared to the load, generally speaking.

29th March 2006, 06:57 PM	#12
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	I think you'll find it's 2V. I don't have the "Red Book" standard, but that's the accepted figure and I've measured a number of players that corroborated that number. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

29th March 2006, 07:00 PM	#14
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Oh yes, we shouldn't forget the players that were designed to sound better in AB tests by virtue of being louder. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

29th March 2006, 10:08 PM	#16
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	Re: Lets Try This Again And then there's the swamped common cathode stage (partially bypassed). Using an unbypassed cathode resistance of 1/gm, on its own or in combo with some bypassed resistance or an LED, will linearise the transfer curve. About Zo, it should be low compared to the load, generally speaking.

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29th March 2006, 06:50 PM	#11
audiohead diyAudio Member Join Date: Mar 2005 Location: Los Angeles, california	With all due respect, all CD players @ 0dBFS have 1 Vrms output not 2!

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