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Chip Amps Amplifiers based on integrated circuits

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Old 19th February 2012, 02:17 PM   #1
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Smile Which is better,OPA4228 OR OPA404?

I'm new here,this is my first post.

Resently,my friend gave me several chips,OPA404,OPA4228,OPA2132,OPA2134,OPA2111,OPA26 04,which have better performance?

Please,give me some ideas, thanks!!!
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Old 19th February 2012, 06:54 PM   #2
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What do you want to do with them, at what source impedance, gain, and what supply voltage?
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Old 20th February 2012, 04:20 AM   #3
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Preamp, supply voltage is +-15V
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Old 20th February 2012, 06:25 AM   #4
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You could download the datasheets and compare the specs yourself. They are all good.

The audio performance depends on the circuit you use them in. If you design the circuit specifically for each op amp, you will notice little difference, if any. If you just use any circuit and swap the op amps without adapting the circuit to it, you will notice a difference. In that case you don't have an objectively good amp, but a subjectively good one, and that makes the classification a question of your personal taste.

You can not swap the four channel op amps (404, 4228) into the boards for the two channel op amps and vice versa, so you need at least two different boards for the test.
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Old 21st February 2012, 01:32 AM   #5
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OPA404 and OPA2111 both use the TI Difet process, which may possibly offer better performance out of the other FET input ones. If for moderately low source impedance though, my pick with be OPA4228, that is if you can work with a quad opamp and that the preamp has a gain > 5x.
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