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Old 20th July 2015, 12:38 PM   #1
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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?
Thanks
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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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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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