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Ultra-high performance, yet rather simple - hybrid and more!
Ultra-high performance, yet rather simple - hybrid and more!
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Old 8th November 2017, 12:24 PM   #991
vzaichenko is online now vzaichenko  Russian Federation
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Ultra-high performance, yet rather simple - hybrid and more!
That's right - later on, I have replaced those single blue LEDs by 2 x red LEDs.
I have tested configuration with single red LEDs, but it showed poorer performance at high swings with some types of LEDs, so I don't recommend using it.
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Old 8th November 2017, 03:58 PM   #992
AndrewT is offline AndrewT  Scotland
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could you add a link to post1 for the updated schematic?

see this example of a post1 index
2stageEF high performance class AB power amp / 200W8R / 400W4R
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Old 10th November 2017, 02:55 AM   #993
duyminh1984a is offline duyminh1984a  Viet Nam
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Quote:
Originally Posted by vzaichenko View Post
One thing right away - I recommend to use 2 x red LEDs in VAS cascodes - I see only one LED in each shoulder on your photos. This may be one of the reasons of higher distortion at higher volumes.
I use 2 red LEDs in VAS cascodes
I am running a 1 LED test.
I removed the two 220pf OP capacitors and it immediately deformed the sound
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