The Kuartlotron - keantoken's simple error-correction superbuffer
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 6th May 2015, 02:05 AM #241 jameshillj   diyAudio Member   Join Date: Feb 2005 Location: Melbourne Ah, right - simple. I had another question about your webpage that I can't figure out and wondered if it's a misprint - this is just below the diagram of the 'ideal transistor' - the underlined bit The mechanism that causes this result is surprisingly simple - Since Ic(Q2) = Ic(Q4), Vbe(Q2) = Vbe(Q4). Similarly, Ic(Q1) = Ic(Q2), so Vbe(Q1) = Vbe(Q3). Since Vbe(Q3) = Vbe(Q4), this means Vbe(Q1) = Vbe(Q2), which is to say, the Vbe of Q1 is directly cancelled by the correction signal across Vbe(Q1). Thanks ... James
keantoken
diyAudio Member

Join Date: Aug 2006
Location: Texas
Oops, that needs to be corrected. It should be

Quote:
 ... the Vbe of Q2 is directly cancelled by the correction signal across Vbe(Q1)
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!

 6th May 2015, 03:50 AM #243 arthur diyAudio Member   Join Date: Oct 2001 Location: . Apart from Vbe, do we need Hfe matching and N P matching ? Thanks
 6th May 2015, 03:53 AM #244 keantoken   diyAudio Member     Join Date: Aug 2006 Location: Texas No. N/P matching may actually worsen performance. __________________ The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer! Need something built, repaired or modded? PM me and ask what I can do!
Project16
diyAudio Member

Join Date: Nov 2012
Location: Cognac
I hope not bother you too!

I have made some arrangement and I have two suggestions for the layout of the ground track.

Attached Images
 Opt1.png (34.3 KB, 445 views) Opt2.png (34.1 KB, 444 views)

 6th May 2015, 03:54 PM #246 jameshillj   diyAudio Member   Join Date: Feb 2005 Location: Melbourne I like the first one best (left hand design) with the more symmetrical arms to the power caps and the way you've separated the IN & OUT ground pins - R7 & R8 belong to this current path, not the power supply tracks, and moving R2 upwards fixes R7, but R8 not so easy - another way would be to exchange R7 and C3 positions, and also exchange R8 and IN terminal and push up that R8 into a new gap created between R9 & R5 .... interesting, eh! You could perhaps squeeze the R11 vertical instead of the link - might need to alter tracks around R9 but quite 'do-able' - you might add a bit more clearance on the C4 & C5 caps. I wonder if the IN & OUT terminals could be brought a bit closer to the board's edge - the track R6 to R4 is the problem - the only way I see around it is to put the R4 underneath and use it 'stretched out' as a link to a donut next to R6, but not very pretty and subject to mistakes - hmm! As this is just the single channel, I wonder if it's worth looking at adding another mirror image buffer (with appropriate transistor adjustments) on the left hand side of the power input terminal for a stereo buffer and you wouldn't need to duplicate the caps C4 & C5 - just an idea (the pots R1, R5 & R9 make it impractical to stack them on top) As 'kt' mentioned above, you could add a 2nd layer that would replace the capacitor return tracks and provide ground plane merits, but with this simple design, we could make these boards at home I have a habit of squeezing components a bit closer together - you could perhaps do the same here - it looks to be about 60 x 50 mm at present? Looking good, IMO
Project16
diyAudio Member

Join Date: Nov 2012
Location: Cognac
Jameshillj thank you for the advice.

It's better like that?

The dimensions of the circuit are 5.0 cm x 4.5 cm

Regard's!
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 Vers. 5.png (33.8 KB, 422 views)

 6th May 2015, 06:55 PM #248 MisterRogers   diyAudio Member   Join Date: Aug 2011 Location: Aurora, Colorado I second the request to have two channels on a single board. Not a big deal, but I imagine the majority of time these will be built in stereo pairs.
Project16
diyAudio Member

Join Date: Nov 2012
Location: Cognac
To shorten a little some tracks I have changed the connections to the pads trimmers, the rotation does not matter I think. I also made a small change on the ground track of R7 and R8.
Attached Images
 Vers. 6 - Top.png (19.7 KB, 416 views) Vers. 6 - Bot.png (20.3 KB, 405 views) Vers. 6 - All.png (33.9 KB, 97 views)

 6th May 2015, 11:41 PM #250 jameshillj   diyAudio Member   Join Date: Feb 2005 Location: Melbourne Looking rather neat now - like that track for the R7 & R8 Maybe have another look at the trimmer pots, at least R1 & R7 anyway - turning the adjust knob clockwise will increase 1 trimmer but decrease the other - perhaps it might be worth making them consistent Apart from that it seems to be pretty complete - any thoughts about maybe a stereo version - if you were to add this to the 'DirtyPCB' list, a double sized board would cost maybe U\$25, instead of the basic U\$14, and complement 'sikahr's' boards well. ... later

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