Phase Lead: C or RC compensation

GEirin · 24th February 2010, 07:45 AM

Hi all
Question:Which Phase Lead?
In Pass A40 amplifier use Capacitor compensation (C4).
And JLH 100W use RC compensation (R5/C6).
Which is better or which is design criterion. Pros and cons.
Thanks
GEirin

h_a · 24th February 2010, 10:01 AM

There are many free application notes available on stability just google

D. Feucht, 2-pole compensation
R. Mancini, SLOA020A from TI

and more. These cover the technical side of things, for listening impressions you need to dig the forum.

Have fun, Hannes

AndrewT · 10:12 AM

Hi,
in a later version of the JLH he adopted a variable resistor for R5 and said trim until the squarewave was the most accurate shape. But he had 5 different locations where he installed comp in this one amplifier. Crimson also has multiple comp locations.

This type of compensation is very common in British designed amplifiers. Much less common outside the UK.

Notice the ratio of nearly 3:1 for r20:r14, the delay on the q9 protection and 4locations for comp.

What is the purpose of C4?

gaetan8888 · 03:20 AM

Hello

Here is the link to the two articles of D. Feucht about 2-pole compensation:

Part 1:

http://www.analogzone.com/col_0628.pdf

Part 2:

http://www.analogzone.com/col_0719.pdf

Bye

Gaetan

GEirin · 25th February 2010, 09:24 AM

h_a, AndrewT and Gaetan8888
Thanks very much for yours replys.
GEirin

24th February 2010, 10:06 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, in a later version of the JLH he adopted a variable resistor for R5 and said trim until the squarewave was the most accurate shape. But he had 5 different locations where he installed comp in this one amplifier. Crimson also has multiple comp locations. This type of compensation is very common in British designed amplifiers. Much less common outside the UK. Notice the ratio of nearly 3:1 for r20:r14, the delay on the q9 protection and 4locations for comp. What is the purpose of C4? __________________ regards Andrew T. Last edited by AndrewT; 24th February 2010 at 10:12 AM.

25th February 2010, 03:09 AM	#4
gaetan8888 diyAudio Member Join Date: Apr 2007	Hello Here is the link to the two articles of D. Feucht about 2-pole compensation: Part 1: http://www.analogzone.com/col_0628.pdf Part 2: http://www.analogzone.com/col_0719.pdf Bye Gaetan Last edited by gaetan8888; 25th February 2010 at 03:20 AM.

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24th February 2010, 10:01 AM	#2
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	There are many free application notes available on stability just google D. Feucht, 2-pole compensation R. Mancini, SLOA020A from TI and more. These cover the technical side of things, for listening impressions you need to dig the forum. Have fun, Hannes

25th February 2010, 09:24 AM	#5
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	h_a, AndrewT and Gaetan8888 Thanks very much for yours replys. GEirin

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