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Old 29th December 2012, 06:41 PM   #1601
bonfis is offline bonfis  United States
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Originally Posted by canonnica View Post

I think I've found what'S causing the dent on the downward slope that occurrs on my test bench. It seems to be caused by the VAS bootstrap. In the simulator, If I only put a CCS, the dent doesn't appear. If I put a bootstrap only, the dent is present. That dent is there while using the initial CCS/bootstrap configuration. For all the tests in simulation, I arrange to have the exact same 16mA at the VAS emittor, and to have 54mV bias.

"curious" Mart...
Martin-
I was able to replicate your results in simulation using my own amps configuration. I can confirm that removing the bootstap (BS) cap. eliminates the waveform dent. I also checked distortion values in simulation with and without the BS. At 20 Khz they are much lower without than with the BS. This is true even for output levels well below clipping. Next step is to make the change on the amp itself.

Will report back.
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Old 29th December 2012, 07:03 PM   #1602
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Default Ahahahha!...i cannot do it because i have no Ipod to test it Evette

Signal from Ipod needs some filtering.... the line out jack to headphone need...i am not sure about the line out jack.

regards,

Carlos
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Old 29th December 2012, 09:02 PM   #1603
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Mr. Carlos forgive me I,m a confused old man.. Evette
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Old 29th December 2012, 10:15 PM   #1604
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by bonfis View Post
Martin-
I was able to replicate your results in simulation using my own amps configuration. I can confirm that removing the bootstap (BS) cap. eliminates the waveform dent. I also checked distortion values in simulation with and without the BS. At 20 Khz they are much lower without than with the BS. This is true even for output levels well below clipping. Next step is to make the change on the amp itself.

Will report back.
Good news ...
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Mr. Carlos forgive me I,m a confused old man.. Evette
Old man , yes , confused ...?
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Old 30th December 2012, 01:31 AM   #1605
evette is offline evette  Canada
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Yes Wayne Too many of Rudi's Whiskies. LOL Evette
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Old 30th December 2012, 02:43 AM   #1606
a.wayne is offline a.wayne  United States
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You're in the North pole , a little winterhaven egg nog for you ...
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Old 30th December 2012, 12:19 PM   #1607
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Lightbulb PCB

I found this design (image attached) anyone know where all the information is complete, they seem to realize companion show: Alex MM
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Old 30th December 2012, 06:15 PM   #1608
BMW850 is offline BMW850  Netherlands
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I have soldered the 100R resistors and the bias set to 54mv.
Wow what a heat after an hour, that should be me thinking about my Musical Fidelity P270 years ago.
I have the bias back to 24mv and what a great sound now.
You have the volume knob no longer in the hand, you always want to turn the music harder.
Thank you Steve and Martin for the measuring info.

Regards,
Rudy
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Old 30th December 2012, 06:22 PM   #1609
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No problem rudy... Glad you like it so much now!
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Old 30th December 2012, 06:23 PM   #1610
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Rudy,
Is it much differend like before?
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