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Old 3rd November 2011, 09:52 AM   #311
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by powerflux View Post
like this? i really dislike the way the drivers are routed. there is only space for the tiniest decoupling caps..

Click the image to open in full size.
I am not too concerned about the drivers, but the way C9 returns to the ground is a problem: it loops back more or less randomly through the input section, and this is going to cause troubles.


The best solution would be to push the big schottky's D4 & 5 towards the center of the board and place the decouplings on the outside, near the edges.

Alternatively, as a second best, it is possible to choose a better return path for C9, without modifying the placement of components.
See pic.
It is also important to define a power and output ground clearly, where the Zobel also has to return: mainly to the right of the board.
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File Type: gif CircloCorr1.GIF (94.5 KB, 561 views)
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Old 3rd November 2011, 06:48 PM   #312
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If we concern the route of current flowing from supply pads, I think that C8 and C9 are not visible to the circuit. Supply pads should see these caps prior to the whole circuit. V0.4 pcb with free soldering option is more attractive in my opinion.

Last edited by terranigma; 3rd November 2011 at 07:06 PM.
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Old 4th November 2011, 03:07 AM   #313
Bigun is online now Bigun  Canada
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Quote:
Originally Posted by odysseybmx414 View Post
... I hear the Circlophone, and I have more detail in the music than I have ever heard, and I am talking about songs I have been listening to since I was a kid. On top of that it is so musical and "sweet" than I always want to switch it on and play music, even in the most inappropriate situations.
This is a great endorsement - and I remain attracted to the sheer ingenuity of this design. My 2N3055's are still waiting unused for me to finish other projects but I shall be keeping an eye on this Circlophone
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Old 4th November 2011, 11:25 AM   #314
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i'll just enlarge the PCB a bit, that's the best way to fix these issues
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Old 8th November 2011, 11:42 AM   #315
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Quote:
Originally Posted by powerflux View Post
i'll just enlarge the PCB a bit, that's the best way to fix these issues

Hi powerflux,

I really appreciate your effort on this circuit..any update of your pcb layout? Thank you..

Regards,
Boyet
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Old 18th November 2011, 04:41 PM   #316
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a quick one. forgot about this project since i'm buisy with an I/V converter.
let's call this 0.6.

- enlarged PCB a bit
- fitted caps

Click the image to open in full size.

now i want to get rid of the whole groundplane on the left side and just route on specified path back. opinions?

EDIT: like this. 0.7
Click the image to open in full size.

Last edited by powerflux; 18th November 2011 at 05:11 PM.
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Old 18th November 2011, 05:20 PM   #317
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if the groundplane-one is preferred, here is an update

0.6A
Click the image to open in full size.
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Old 18th November 2011, 07:34 PM   #318
Elvee is offline Elvee  Belgium
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This time, I think it is about OK. I would just change the placement of the power and output ground pads to eliminate the effect of the class B current from the positive side, but otherwise it is good, and this applies to all versions.
The ones with the complete ground plane are more risky, less deterministic: they might very well outperform the plain boring single ground ones, but I cannot tell for sure.
Any version will perform acceptably.

Some refinements would still be possible to minimize induction effects from the outputs currents, but the improvements gained would be below the current level of performance of the amplifier, and a proper dressing/placement of the wiring would give similar results so I think we can leave it there.
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File Type: jpg Circlocorr.jpg (141.2 KB, 137 views)
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Old 18th November 2011, 08:37 PM   #319
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printed PDF's, filled in the componentvalues. i really hope i didn't make mistakes. thank you for your patience
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File Type: pdf Circlophone v1.0.pdf (111.8 KB, 180 views)

Last edited by powerflux; 18th November 2011 at 08:42 PM.
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Old 22nd November 2011, 11:14 PM   #320
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Default My dirty setup

At last I finished and listened one channel. I have modified wakibaki's pcb respecting 2sa/2sc small signal transistors. During populating parts, it was not easy to deal with narrow headers and bridges.. just needed some patient.

My setup:
2sa970 as PNP small signal
2sc2240 as NPN small signal
2sa1930 as Driver
2N3442 as output (test setup)
2N3020 as bias servo
180pF as C12 (servo compensation)
1200pF as C6 (main compensation)
31V per rail
Unbalanced signal

After sure that there is nothing wrong with dc-offset, bias current etc, I plugged speakers. On first listen, I realized that all efforts was absolutely worthy for this amazing amp! I'm listening one channel with two speakers parallel and I'm forgetting each time that I'm listening actually one channel.

First big impression is DEAD SILENCE even with my 100db speakers! I never expected this level of silence. There are radio station antennas near my house those interfere with my gear easily. Circlophone barely kicked it.

Second big impression is human voice. Just impressive!

Detailed, well bodied presentation without any haze as mentioned by oddyseybmx before. I gained my expectations so far and I hope to finish second channel in short time.

Thank you for all collaboration.
Attached Images
File Type: jpg circlo-close.JPG (145.9 KB, 208 views)
File Type: jpg circlo-setup.JPG (166.2 KB, 3604 views)

Last edited by terranigma; 22nd November 2011 at 11:27 PM.
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