Pumuckel
Recently, the topic of power supplies for the Alephs has become interesting again. See here and in the Aleph-X wiki for more information. 350mA from the power supply seems high to me and I would look to quiet that before looking further up the amp. I would ask some of the other members in the thread above their opinion since they may know more about the pre-X Aleph.
Recently, the topic of power supplies for the Alephs has become interesting again. See here and in the Aleph-X wiki for more information. 350mA from the power supply seems high to me and I would look to quiet that before looking further up the amp. I would ask some of the other members in the thread above their opinion since they may know more about the pre-X Aleph.
Pumuckel said:
Hi Christian,
Your descripion sounds like you are collecting "hum" somewhere
not ripple!
Look if this is 50 or 100Hz!
-> 100Hz is maybe some PSU induced hum.
-> 50Hz is maybe grounding problem.
Put away all input cables make a shortcut on all 3 input pins
and look if the hum changes.
Uli
HI,
Here are a few measurements of the ripple I took right now. the funny thing is that the left and right channel behave different.
What in the aleph circuit is responsible for the PSRR?
How does the bias current of the first stage affect PSRR?
Any ideas??
I'm sitting in the lab right now, so I can try things out and give feedback.
Christian
Here are a few measurements of the ripple I took right now. the funny thing is that the left and right channel behave different.
What in the aleph circuit is responsible for the PSRR?
How does the bias current of the first stage affect PSRR?
Any ideas??
I'm sitting in the lab right now, so I can try things out and give feedback.
Christian
Attachments
noise
another question:
do you HEAR the noise from the speakers?
sometimes you get the hum at such lo measuring levels
from the measurement arrangement.
are both channels really equal? (wire location, age of caps
etc., DISTANCE to XFMR ! board location in relation to XFMR.
Try to locate the XFMR + caps somewhere in another case
Uli
another question:
do you HEAR the noise from the speakers?
sometimes you get the hum at such lo measuring levels
from the measurement arrangement.
are both channels really equal? (wire location, age of caps
etc., DISTANCE to XFMR ! board location in relation to XFMR.
Try to locate the XFMR + caps somewhere in another case
Uli
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