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Setting Offset - Proper setup
Setting Offset - Proper setup
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Old 12th January 2007, 04:37 AM   #11
Zero Cool is offline Zero Cool  United States
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Join Date: Sep 2004
Location: MN
Default Re: Offset compensation and Adjust

Originally posted by lineup

In your amplifier I would try the more simple method
or something like it.
Like is shown in my Attachment.

I dont really have a choice. this is a Classe amplifier i am repairing. not a new design.

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Old 12th January 2007, 07:50 AM   #12
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
you do the set up @ operating temperature.
However, it is worth checking what happens to both output offset and Iq as the temperature changes from start up to final operating temperature.

As an example, you may find that offset varies from 30mV cold to -20mV warm. You can move the warm setting to 0mV but the cold value will increase to about 50mV. A good compromise might be 40mV cold to -10mV warm and most of the time during warm up it is in the range +-10mV. This setting will vary a little with the seasons (even in centrally heated homes the summer temps exceed the winter temps).
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 13th January 2007, 02:32 PM   #13
KISS is offline KISS  United States
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Join Date: Jan 2007

Note the service notes for the amp in question generally recommend monitoring the bias regulator first before actually setting the actual value of the bias current. Their test points are referenced to ground where I tend to monitor the difference.
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