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Old 4th June 2013, 10:58 AM   #31
dadod is offline dadod  Croatia
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This one can drive the headphones from 32ohm(Grado) and up to 300ohm(Sennheiser) with very low distortion(second and third harmonics only).
Damir
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Old 5th June 2013, 07:03 PM   #32
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Originally Posted by dadod View Post
This one can drive the headphones from 32ohm(Grado) and up to 300ohm(Sennheiser) with very low distortion(second and third harmonics only).
Damir
are you closer and closer to poweramp with this technique? ;-)
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Old 5th June 2013, 07:31 PM   #33
dadod is offline dadod  Croatia
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are you closer and closer to poweramp with this technique? ;-)
You are right, I am thinking haw to do that. There are some power amp of similar kind but with to high distortion.
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Old 23rd June 2013, 10:15 AM   #34
dadod is offline dadod  Croatia
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This is simulated THD20k with 300 ohm load(SENNHEISER phones) and THD20k with 32 ohm load(GRADO phones). I don't have time before autumn to make working prototype, that is pity as it should be excellent preamp and no need for exotic components just BC550/560 and BD139/140(or KSA1381/KSC3503 or BF470/471) transistors.
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File Type: jpg GainWire-mk2-32_300-FFT20k-300ohm.jpg (217.8 KB, 440 views)
File Type: jpg GainWire-mk2-32_300-FFT20k-32ohm.jpg (219.1 KB, 382 views)
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Old 23rd June 2013, 10:20 AM   #35
Bigun is offline Bigun  Canada
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Originally Posted by dadod View Post
No comments on this simple output buffer?
It would be more interesting (to this forum at least) to see power amp version
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Old 23rd June 2013, 10:22 AM   #36
dadod is offline dadod  Croatia
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This is simulated noise at full gain(P1 set to 10 kohm) and at 40dB attenuation (P1 set to 100ohm).
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File Type: jpg GainWire-mk2-32_300-noise at-full-gain.jpg (204.8 KB, 360 views)
File Type: jpg GainWire-mk2-32_300-noise at-40dB-attenuation.jpg (210.6 KB, 332 views)
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Old 23rd June 2013, 10:28 AM   #37
dadod is offline dadod  Croatia
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Originally Posted by Bigun View Post
It would be more interesting (to this forum at least) to see power amp version
I am trying, I am trying. It's easy to make the gain part but output buffer is hard nut. If EF2 or triple is used with no feedback there to much distortion(to my taste). I tried diamond buffer with a triple EF ans still to much THD. I am thinking now to try a buffer with NF(only from output of the buffer to the buffer input). Any suggestion??
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Old 23rd June 2013, 11:38 AM   #38
RCruz is offline RCruz  Switzerland
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Old 23rd June 2013, 11:41 AM   #39
MiiB is offline MiiB  Denmark
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Originally Posted by dadod View Post
I am trying, I am trying. It's easy to make the gain part but output buffer is hard nut. If EF2 or triple is used with no feedback there to much distortion(to my taste). I tried diamond buffer with a triple EF ans still to much THD. I am thinking now to try a buffer with NF(only from output of the buffer to the buffer input). Any suggestion??
What about a Cordel feed forward error correction type..??
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Old 23rd June 2013, 11:56 AM   #40
dadod is offline dadod  Croatia
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What about a Cordel feed forward error correction type..??
Yes I was thinking about that one too, or maybe this from Edmond Class i and siblings
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