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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 6th May 2015, 02:05 AM   #241
jameshillj is offline jameshillj  Australia
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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
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Old 6th May 2015, 02:53 AM   #242
keantoken is offline keantoken  United States
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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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Old 6th May 2015, 03:50 AM   #243
arthur is offline arthur
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The Kuartlotron - keantoken's simple error-correction superbuffer
Apart from Vbe, do we need Hfe matching and N P matching ?
Thanks
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Old 6th May 2015, 03:53 AM   #244
keantoken is offline keantoken  United States
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No. N/P matching may actually worsen performance.
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Old 6th May 2015, 01:21 PM   #245
Project16 is offline Project16  France
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I hope not bother you too!

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

Thank you for your answers!
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Old 6th May 2015, 03:54 PM   #246
jameshillj is offline jameshillj  Australia
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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
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Old 6th May 2015, 06:00 PM   #247
Project16 is offline Project16  France
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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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Old 6th May 2015, 06:55 PM   #248
MisterRogers is offline MisterRogers  United States
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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.
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Old 6th May 2015, 07:40 PM   #249
Project16 is offline Project16  France
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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.
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Old 6th May 2015, 11:41 PM   #250
jameshillj is offline jameshillj  Australia
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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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