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Old 7th March 2007, 11:15 PM   #1
hags is offline hags  United States
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Default Acceptable DC offset voltage

Hello all,
I have set up a simple buffer circuit using two OPA134APs. I do not have null trimpots on it (didn't have any of the appropriate value in the parts bin), I have 770 uV on one output and 50uV on the other.
What is the minimum acceptable dc offset voltage for use with my power amp (Adcom 545II)?
I'm also using Panasonic 10uf bypass caps on the supply line right at the pins of the op amps, is this considered too big?
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Old 8th March 2007, 10:51 AM   #2
Dxvideo is offline Dxvideo  Turkey
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I am using LM833N pre for my LM4780 amp.
There is a linkwitz compensation on NFB line of LM833.. And my DC offset on preamp output is absolutely 0 mV. But on LM4780 i have +11mV on each channel.
Best regards,
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Old 8th March 2007, 10:56 AM   #3
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Less than 1 mV is very good. Nothing to worry about if this is from a line level buffer.
/Per-Anders (my first name) or P-A as my friends call me
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