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Old 24th March 2004, 05:15 AM   #1
dimitri is offline dimitri  United States
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Default new Renardson amp

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
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Old 24th March 2004, 05:34 AM   #2
dimitri is offline dimitri  United States
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Default another amp

And another amp based on the same principles from Czech
http://petrh.czweb.org/renardson.php
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Old 24th March 2004, 08:05 PM   #3
PMA is offline PMA  Europe
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There is a cross-over distortion error correction in both schematics, listenning experience would be appreciated.
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Old 27th March 2004, 09:49 AM   #4
dimitri is offline dimitri  United States
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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”.
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Old 27th March 2004, 09:54 AM   #5
dimitri is offline dimitri  United States
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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
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Old 27th March 2004, 10:12 AM   #6
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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.
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Old 27th March 2004, 02:21 PM   #7
sss is offline sss  Israel
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does any 1 know how this distortion correction works?
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Old 27th March 2004, 03:13 PM   #8
dimitri is offline dimitri  United States
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dear milwood and sss,
you can read there
http://www.angelfire.com/ab3/mjramp/
or I can send additional info to you
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Old 27th March 2004, 06:34 PM   #9
PMA is offline PMA  Europe
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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
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Old 27th March 2004, 07:47 PM   #10
dimitri is offline dimitri  United States
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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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