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Old 27th January 2007, 09:49 PM   #1
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Default Hafler DH500 DC Offset

In anticipation of upgrading my DH500 with the Musical Concepts PA-3C driver boards, I decided to check DC offset in my DH500 and found the right channel at .125VDC and the left channel at -.550VDC. I was able to adjust the right channel to less than .010VDC but I cannot get the left channel better than -.220VDC.

My question is can I assume the DC offset problem is on the driver board and if I replace it with the Musical Concepts board the problem will go away.

The Hafler DH500 schematic can be found here:


Thanks for any help.
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Old 27th January 2007, 09:53 PM   #2
anatech is offline anatech  Canada
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Hi LHMAudio,
Yes. That should be what happens.

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Old 27th January 2007, 10:00 PM   #3
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Thanks for your quick reply. I will move forward with the Musical Concepts boards then.
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