Acceptable DC offset voltage

hags · 7th March 2007, 11:15 PM

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?

Dxvideo · 8th March 2007, 10:51 AM

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.

peranders · 8th March 2007, 10:56 AM

Less than 1 mV is very good. Nothing to worry about if this is from a line level buffer.

7th March 2007, 11:15 PM	#1
hags diyAudio Member Join Date: Nov 2004 Location: Chain o' Lakes	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?

8th March 2007, 10:51 AM	#2
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	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, Ozgur

8th March 2007, 10:56 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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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