The Kuartlotron - keantoken's simple error-correction superbuffer - Page 2 - diyAudio
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Old 17th February 2014, 08:38 PM   #11
RCruz is offline RCruz  Switzerland
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Can we avoid the input cap ?
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Old 17th February 2014, 08:42 PM   #12
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I can make a version for that, but it would be sending signal through power supply caps and I don't like to do that. Do you have an example of this kind of circuit?
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Old 17th February 2014, 08:44 PM   #13
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You can do it with J-Fets of cause.
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Old 17th February 2014, 09:10 PM   #14
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Guys, I'm suddenly having some interesting ideas, so the Kuartlotron is still very much an evolving circuit. Anyone who would be interested in testing out different versions should speak up. I have one idea to increase PSRR and another to make trimming simpler, but at the moment I can't test all these ideas and don't like to post untested circuits.
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Old 17th February 2014, 09:19 PM   #15
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I can build P-P fast.
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Old 17th February 2014, 09:31 PM   #16
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Well then, try a 560R resistor in series with C1. This causes the error correction to compensate for PSRR. Simulation shows a 27db improvement in PSRR (20 times), to 102db for the positive half. The simulator is usually accurate for the BC5xx/BC3x7 transistors, so I really think this is worth a try.

So is there a way you could test PSRR before and after?
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Old 17th February 2014, 09:37 PM   #17
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I have my build at Martina.
When i get it back i can try it.
I have an FFT analyser to ckeck PSRR.
Maybe i also build another one.
That has to wait until tomorrow.
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Old 17th February 2014, 09:43 PM   #18
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Great!
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Old 17th February 2014, 09:45 PM   #19
brianco is offline brianco  Ireland
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With Joachim and Marina's approval of the early design coupled with the improvements you have in mind - it does appear that you have a very viable design. Congratulations.

I may well try a PtP build as a switching + volume control. In the meanwhile I would like to see the initial PS design provided you feel like sharing.

Good luck.
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Old 17th February 2014, 09:45 PM   #20
Zero D is offline Zero D  United Kingdom
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@ keantoken

Re - The Kuartlotron

Hi, i've only had a little time to play with it, but so far in Sim

I found that with R1 = 60R - R5 = 2k THD was less than 0.001% @ 1kHz & 20kHz. Output load was tried @ 1k & 2k, so driving most next stages should be no problem !

Is R9 supposed to be 2700k = 2.7M or 270k ? Anyway i tried both & didn't see a difference !

Great work
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