Credo PMP154 question - diyAudio
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Old 20th July 2015, 12:38 PM   #1
diyAudio Member
Join Date: Jan 2006
Location: hanoi
Default Credo PMP154 question

Hi all,
Attached is the schematic of my the Credo PMP154 (which I am repairing), that I traced and drew myself.
However there is one question, since I dont have much experience with solid state circuits, I am not sure about the function of the 4k7 trimmer near Q6 BC546. Can anyone help me?
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File Type: jpg PMP154.JPG (494.3 KB, 23 views)
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Old 20th July 2015, 02:00 PM   #2
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Join Date: Apr 2010
Location: Coffs Harbour
As it controls the bias current to only one side of the mirror image input stage, the trimpot can only be to null the DC offset at the output. The series-shunt resistors there are most likely to ensure safety, should the pot fail.
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