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-   -   The Kuartlotron - keantoken's simple error-correction superbuffer (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer.html)

RCruz 17th February 2014 08:38 PM

Can we avoid the input cap ?

keantoken 17th February 2014 08:42 PM

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?

Joachim Gerhard 17th February 2014 08:44 PM

You can do it with J-Fets of cause.

keantoken 17th February 2014 09:10 PM

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.

Joachim Gerhard 17th February 2014 09:19 PM

I can build P-P fast.

keantoken 17th February 2014 09:31 PM

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?

Joachim Gerhard 17th February 2014 09:37 PM

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.

keantoken 17th February 2014 09:43 PM

Great! :)

brianco 17th February 2014 09:45 PM

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.

Zero D 17th February 2014 09:45 PM

1 Attachment(s)
@ 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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