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Old 21st December 2012, 02:03 AM   #41
Bigun is offline Bigun  Canada
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my bad memory, I just took a look at the krill schematic - completely different!
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Old 21st December 2012, 10:03 AM   #42
Elvee is offline Elvee  Belgium
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can you post the .asc file for us to play with ?
Here you are:
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File Type: asc MiniB06.asc (8.5 KB, 56 views)
File Type: asc MinibAC6.asc (9.4 KB, 48 views)
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Old 5th January 2013, 08:56 AM   #43
Elvee is offline Elvee  Belgium
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I have begun some tests on a real prototype.

There are some discrepancies compared with the sim, essentially stability/compensation issues, but the first results look promising.
Most of the transistor types are different though, which could be an explanation.

By somewhat increasing the compensation caps, I can get a clean squarewave.

Linearity assessment will be a difficult task and will require some creativity. It could be some time before I can report results on that aspect.
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Old 8th January 2013, 05:09 PM   #44
Elvee is offline Elvee  Belgium
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Here is the circuit updated with actual stability values.

The main changes are an increase of the main compensation caps, the addition of a small amount of local feedforward, an RC Zobel network, and the bypassing of the emitter resistors.
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Old 11th May 2013, 08:19 AM   #45
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Hi Elvee,

Have you made a listening test with prototype? How does it sound compared to your other designs? I wonder if you catch something extraordinary within those complexity.

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Old 11th May 2013, 05:31 PM   #46
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by terranigma View Post
Hi Elvee,

Have you made a listening test with prototype?
Yes, I had that curiosity
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How does it sound compared to your other designs?
Desperately neutral and unremarkable, but people with golden ears should take up this task.
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Old 26th February 2014, 08:46 AM   #47
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Default guitar/line buffer proposition

Hi
this time I have the idea of small signal pp source follower buffer with floating power supply.
the results are for 1Vpp at the input, the load is 10k.
for guitar the loads are much higher, 220k-10Meg which means lower distortion.
the circuit is easy for mounting inside the guitar together with the battery.
remember about hf blocking circuits.
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File Type: png sch.png (17.9 KB, 159 views)
File Type: png sine.png (13.9 KB, 150 views)
File Type: png fft20k.png (11.5 KB, 127 views)
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File Type: asc inv foll guit buff jfet.asc (2.2 KB, 12 views)
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Last edited by padamiecki; 26th February 2014 at 08:47 AM. Reason: ups, this was for small signal, apologize for post it here
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Old 26th February 2014, 08:56 AM   #48
Bonsai is offline Bonsai  Taiwan
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Very nice padamieckei!!!!

Ultra simple and elegant

The difference between a Porche and a Lamborghini - both good, but totally different.

However, what is the connection between performance and JFET matching?

Thanks for sharing!

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Old 26th February 2014, 12:35 PM   #49
Elvee is offline Elvee  Belgium
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The main quality of this circuit is its wire-like behavior;unfortunately, it is also its main deficiency....
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Old 27th February 2014, 06:13 AM   #50
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Quote:
Originally Posted by Elvee View Post
The main quality of this circuit is its wire-like behavior;unfortunately, it is also its main deficiency....

it still has caps, so it has a potential to tweak by the audiophiles
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