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Not enough voltage swing in P3A amp ??
Not enough voltage swing in P3A amp ??
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Old 30th June 2003, 07:46 AM   #1
Stormo is offline Stormo
diyAudio Member
 
Join Date: Sep 2002
Location: Denmark
Unhappy Not enough voltage swing in P3A amp ??

Hi all,

I have build several versions of P3A, and i am happy with the sound and all, but..

It is impossible for me to get more than 30 v pp swing from the amp before it clips, and i was hoping for some more. When it clips it is symmetrical.

My rails are at +-42 volt and the PSU is standard with 2*4700uF.

I have tried to feed to voltage stage with a current source and with botstrapped resistors - its all the same.

Does anyone have an idea ??

Thanks and kind regards,

Stormo
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Old 30th June 2003, 08:02 AM   #2
Freddie is offline Freddie  Sweden
diyAudio Member
 
Join Date: Oct 2000
Location: Sweden
Hey

30v pp seems reasonable. Rememer that the rail voltages will fall when you load the amp, and you will also lose voltage across the 0R47 resistors.

http://www.diyaudio.com/forums/showt...threadid=16582

/Freddie
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