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diyAB Amp  The "Honey Badger" build thread
diyAB Amp  The "Honey Badger" build thread
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Old 2nd January 2018, 10:57 AM   #2971
Johno is offline Johno  Australia
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diyAB Amp  The "Honey Badger" build thread
Default R23

I am still using R23 = 47R. If it is taken too low it can affect stability.
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Old 2nd January 2018, 04:06 PM   #2972
thimios is online now thimios  Greece
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Originally Posted by anatech View Post
That journey may have been made for his health. Not to mention the fact that he needs to clear his mind.

He's a really good guy and deserves to recover fully. Let's hope that happens.

-Chris
I worry for him.
Nothing posted for a long.
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Old 2nd January 2018, 05:32 PM   #2973
RCruz is offline RCruz  Switzerland
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diyAB Amp  The "Honey Badger" build thread
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Originally Posted by Johno View Post
I am still using R23 = 47R. If it is taken too low it can affect stability.
Thank you...

I see that Rod uses no resistor here: 60-80W Power Amplifier

And Bigun does neither here: TGM8 - an amplifier based on Rod Elliot P3a

That is why I wondered about this resistor..... maybe we need lower gain in this VAS ??
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Old 2nd January 2018, 05:34 PM   #2974
RCruz is offline RCruz  Switzerland
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diyAB Amp  The "Honey Badger" build thread
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I worry for him.
Nothing posted for a long.
Hope everything is allright
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Old 2nd January 2018, 06:01 PM   #2975
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Johno View Post
I am still using R23 = 47R. If it is taken too low it can affect stability.
Quote:
Originally Posted by RCruz View Post
Thank you...

I see that Rod uses no resistor here: 60-80W Power Amplifier

And Bigun does neither here: TGM8 - an amplifier based on Rod Elliot P3a

That is why I wondered about this resistor..... maybe we need lower gain in this VAS ??
Adding in VAS degeneration reduces stage gain and thus reduces open loop gain.
This will have a direct effect on the stability margins.
Removing the degeneration from an amplifier that has been designed to have adequate, but not excessive stability margins will perform differently and may shown signs of instability, or worse, complete oscillation.

The same argument applies to the Input LTP degeneration.
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Old 2nd January 2018, 07:23 PM   #2976
RCruz is offline RCruz  Switzerland
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diyAB Amp  The "Honey Badger" build thread
Quote:
Originally Posted by AndrewT View Post
Adding in VAS degeneration reduces stage gain and thus reduces open loop gain.
This will have a direct effect on the stability margins.
Removing the degeneration from an amplifier that has been designed to have adequate, but not excessive stability margins will perform differently and may shown signs of instability, or worse, complete oscillation.

The same argument applies to the Input LTP degeneration.
Thank you Andrew.

Now I fully understand the issue.

I would also appreciate your comments about this other issue: Assemblage Power Amp

Best
Ricardo
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Old 4th January 2018, 08:37 PM   #2977
audiorasp is offline audiorasp
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diyAB Amp  The "Honey Badger" build thread
Default LC cap

I'm curious if many builders have added the lead compensation capacitor and if they consider it a "necessary" option. I've looked at the comments in the build guide but would like to know what other builders think.

Thanks
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Old 4th January 2018, 09:11 PM   #2978
helitim is offline helitim  Canada
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I believe the more popular opinion is to leave it out . I'm leaving it out of my build based on others experiences .

Edit: There is a discussion in this thread, or the general badger Thread. You could search the thread for LC, or lead compensation if you didn't want to sift through the 500-ish pages

Last edited by helitim; 4th January 2018 at 09:14 PM.
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Old 4th January 2018, 09:56 PM   #2979
mbrennwa is online now mbrennwa  Switzerland
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Originally Posted by audiorasp View Post
I'm curious if many builders have added the lead compensation capacitor and if they consider it a "necessary" option. I've looked at the comments in the build guide but would like to know what other builders think.

Thanks
I have tried with the LC cap, using different values. It sounded best to my ears without the LC cap.
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Old 4th January 2018, 10:11 PM   #2980
audiorasp is offline audiorasp
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diyAB Amp  The "Honey Badger" build thread
helitim, mbrennwa, thanks.
I will search that general discussion thread also.
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