The Kuartlotron - keantoken's simple error-correction superbuffer - Page 2

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

@ 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

17th February 2014, 08:38 PM	#11
RCruz nhinstruments diyAudio Member Join Date: Sep 2006 Location: Wallis	Can we avoid the input cap ? __________________ Ricardo

17th February 2014, 08:42 PM	#12
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	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? __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

17th February 2014, 09:10 PM	#14
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	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. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

17th February 2014, 09:31 PM	#16
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	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? __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!

17th February 2014, 09:43 PM	#18
keantoken diyAudio Member Join Date: Aug 2006 Location: Texas	Great! __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!


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17th February 2014, 08:44 PM	#13
Joachim Gerhard diyAudio Member Join Date: Mar 2009	You can do it with J-Fets of cause.

17th February 2014, 09:19 PM	#15
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I can build P-P fast.

17th February 2014, 09:37 PM	#17
Joachim Gerhard diyAudio Member Join Date: Mar 2009	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.

17th February 2014, 09:45 PM	#19
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	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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