new Renardson amp

dimitri · 24th March 2004, 05:15 AM

May I draw attention of the respected diyers to a new amp by Mr. Renardson
http://www.angelfire.com/ab3/mjramp/newamp2.html
The PCB will be available soon, if you need it, drop a note to Mr. Renardson

dimitri · 24th March 2004, 05:34 AM

And another amp based on the same principles from Czech
http://petrh.czweb.org/renardson.php

PMA · 24th March 2004, 08:05 PM

There is a cross-over distortion error correction in both schematics, listenning experience would be appreciated.

dimitri · 27th March 2004, 09:49 AM

I have simulated the output and would like to discuss it regardless of John Curl opinion:
”This fellow Renardson, is amazing! He re-invents all of audio circuitry, and then says that high power is not needed in the home”.

dimitri · 27th March 2004, 09:54 AM

Here are simulation results with R8 stepping from 100 to 1000 Ohm,
- transfer function of the output stage,
- current through nonswitching negative (lower) output device,
- transconductance of the output stage, please note the excellent linearity

millwood · 27th March 2004, 10:12 AM

Quote:

Originally posted by PMA
There is a cross-over distortion error correction in both schematics, listenning experience would be appreciated.

I am curious about it too, especially why R9/11/15 are set up that particular way.

sss · 27th March 2004, 02:21 PM

does any 1 know how this distortion correction works?

dimitri · 27th March 2004, 03:13 PM

dear milwood and sss,
you can read there
http://www.angelfire.com/ab3/mjramp/
or I can send additional info to you

PMA · 27th March 2004, 06:34 PM

dimitri,

you are probably using MicroCap7. Have you tried harmonic analysis? I would like to know whether there are or not higher order harmonics, and of what value.

Pavel

dimitri · 27th March 2004, 07:47 PM

Sorry for my slip,
instead "current through nonswitching negative (lower) output device"
please read "current through nonswitching positive (upper) output device"
Pavel, yes, it is uC7, I have not tried harmonic analysis, don't trust simulators... But it is not a problem

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24th March 2004, 08:05 PM	#3
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	There is a cross-over distortion error correction in both schematics, listenning experience would be appreciated.

27th March 2004, 02:21 PM	#7
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	does any 1 know how this distortion correction works?

27th March 2004, 03:13 PM	#8
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	dear milwood and sss, you can read there http://www.angelfire.com/ab3/mjramp/ or I can send additional info to you

27th March 2004, 06:34 PM	#9
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	dimitri, you are probably using MicroCap7. Have you tried harmonic analysis? I would like to know whether there are or not higher order harmonics, and of what value. Pavel

27th March 2004, 07:47 PM	#10
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	Sorry for my slip, instead "current through nonswitching negative (lower) output device" please read "current through nonswitching positive (upper) output device" Pavel, yes, it is uC7, I have not tried harmonic analysis, don't trust simulators... But it is not a problem

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