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The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 22nd August 2015, 05:12 PM   #391
Project16 is offline Project16  France
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Quote:
Originally Posted by keantoken View Post
If you put it after the buffer, use a 10k pot or even 5k. If you put it before, a high resistance pot would be better, such as 50k. 200k could even be used, but I don't know whether it would be better or worse.
Thank you, I have here in my drawers!
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Old 22nd August 2015, 07:01 PM   #392
nattawa is offline nattawa  Canada
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Originally Posted by keantoken View Post
How much better really? I don't see a point, all grounds must be tied at some point so it will have little effect on the actual noise level.

Users would have to crimp on new connectors, the aim was to have a drop-in replacement. If I'm going to make "improvements" to the original layout, the reason should be compelling.
A four-pin connector would make no difference electrically but seems a lot easier for wire crimping as one doesn't have to crimp shield braid ends of two wires onto one terminal of the connector. I don't have a DCB1 buffer and will try to find out how they do it.
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Old 22nd August 2015, 08:04 PM   #393
keantoken is online now keantoken  United States
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Working on the buffer portion of the PCB. Slowly and messily...
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File Type: png Kuartlotron-layout.png (42.0 KB, 404 views)
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Last edited by keantoken; 22nd August 2015 at 08:07 PM.
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Old 22nd August 2015, 08:50 PM   #394
jls001 is offline jls001  India
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Default Where to place the pot?

Quote:
Originally Posted by keantoken View Post
If you put it after the buffer, use a 10k pot or even 5k. If you put it before, a high resistance pot would be better, such as 50k. 200k could even be used, but I don't know whether it would be better or worse.
Can someone give a definitive answer to the question where to place the pot? Before or after the buffer?

From previous advice on this thread, I've used a 10K log before the buffer. But I do have 47K log or 50K log too to try out after buffer, if that's the better place. In the current position, the 10K log isn't all that sensitive from 6 o'clock (zero volume) to about 9:30 o'clock. I would love a more linear response so that about 9:30 gives regular listening volume (10:30 to 11 o'clock is the current 'regular' position, which I guess, by itself, isn't good or bad).

I guess I will have to try the 47K and 50K before buffer as advised above and hear for myself.

PS: if we use pot after buffer, does it mean that the input impedance of the Kuart will be a constant R8 = 10K?

Last edited by jls001; 22nd August 2015 at 08:53 PM. Reason: Added PS
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Old 22nd August 2015, 09:33 PM   #395
keantoken is online now keantoken  United States
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You could make R8=100k. The reason it's 10k is for DC setups since I was asked for a DC version. However this might make your volume pot uneven.

None of your options can damage anything (unless your system is very sensitive to offset). If I were you, I would try them all by listening. After all, every amp responds to source impedance differently, every source responds to load impedance differently. I can only give rough guidelines on what will lower distortion the most. But low distortion doesn't guarantee good sound.

My suggestions:

For driving a power amp: use the pot before the buffer, so the amp benefits from low source impedance.

For buffering sources needing a light load: Use R8=100k. If driving a power amp, a 200k pot before the buffer may be the best option, if it is statically shielded.

To buffer sources needing constant load impedance: Use a 10k or even 5k pot after the buffer.
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Last edited by keantoken; 22nd August 2015 at 09:35 PM.
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Old 22nd August 2015, 09:35 PM   #396
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
The caps are too close, for anyone wanting to zip tie. Which brings up, does one zip tie them together then bend the leads to fit? Long lead length?
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Old 22nd August 2015, 09:37 PM   #397
keantoken is online now keantoken  United States
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Yes, the component spacing is uneven and the transistors could be face to face. Right now I am just working out the possibilities. I will improve spacing once I think I have a viable orientation.
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Old 22nd August 2015, 09:47 PM   #398
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
What about having the caps facing each other in between the transistors?
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Old 22nd August 2015, 09:53 PM   #399
keantoken is online now keantoken  United States
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I think it would make the layout too tall.
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Old 22nd August 2015, 11:03 PM   #400
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Too bad, it's the only way to have entirely equal fields that I've come up with thus far... I plan to use SEPF caps for this however. Same lead spacing etc.

No reply from Joachim yet. Perhaps you should ask him about bypass caps? He might not pass up a contact from you Keantoken.
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