diyAudio Forums Archive > Top > Amplifiers > Solid State new Renardson amp - Click HERE for Original Thread dimitri 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 And another amp based on the same principles from Czech http://petrh.czweb.org/renardson.php PMA There is a cross-over distortion error correction in both schematics, listenning experience would be appreciated. dimitri 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 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 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 does any 1 know how this distortion correction works? dimitri dear milwood and sss, you can read there http://www.angelfire.com/ab3/mjramp/ or I can send additional info to you PMA 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 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 dimitri Dear Pavel, Could you please translate the abovementioned pages: http://petrh.czweb.org/renardson.php http://petrh.czweb.org/renardson_2.php I tried to contact Petr Holub several times but failed :( PMA Dear Dimitrij, I am sorry but I have not that much time. There is nothing new compared to original Renardson's publication. Regards, Pavel dimitri I got several comments from the board members that the amp will have low disto only with active load, and with reactive loads it will be the same as ordinary class B. Now Mr Renardson checked the 20kHz distortion with a parallel capacitance, and added the result to the test page. The distortion was higher than before, but the load impedance is lower, so some increase was expected, but there is no serious crossover problem. capslock Dimitri, what test page are you referring to? The angelfire page is not accessible. dimitri http://www.angelfire.com/ab3/mjramp/test.html http://www.angelfire.com/ab3/mjramp/newamp2.html Nelson Pass quote: Originally posted by dimitri And another amp based on the same principles from Czech http://petrh.czweb.org/renardson.php Reminds me of the bias circuit for the A40.

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