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Old 30th December 2003, 09:15 PM   #1
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Question Best dual opamp for preamp

Which dual opamp is best as input stage in a preamp??
I could use single opamps (OPA627), but in this case I would prefer a dual opamp. Any suggestions and references???
Thanks in advance

Forgot to point out, that both opamps in this dual opamp is used for the same channel, so crosstalk is not a big problem....
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Old 30th December 2003, 09:30 PM   #2
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I heard a lot of good things about the OPA2134. The ESP site has a preamp based on this op amp.
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Old 30th December 2003, 09:36 PM   #3
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For duals I prefer AD8620 and AD826. Second choices for me are opa2134, opa2604.

I have used both AD parts extensively with favorable results.

KevinLee
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Old 31st December 2003, 09:40 AM   #4
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Thanks
I'll look into those......
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Old 31st December 2003, 09:51 AM   #5
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If space is tight, then the already recommended AD8620 is a good choice because it's an 8 pin SOIC. It uses less power than the OPA627/637, it's less expensive, and has nearly as good of specs (THD not quite as good, PSRR not quite as good, input capacitance not...). One knock on the AD IC, it doesn't operate at +/-15V. It's +/-13.5V max (kind of strange).


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Old 31st December 2003, 09:52 AM   #6
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Thanks
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