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Old 25th November 2003, 06:59 PM   #1
Static1 is offline Static1  United States
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Default Op-Amp Matching?

If you have an audio amplifier that uses a Dual op-amp(8-pin) and the ground channel has a single op-amp(8-pin):

Does or should the ground channel op-amp always be the same type(single version of the Dual op-amp used)? or can you use different op-amps for the ground channel ?

Thanks for any help.
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Old 25th November 2003, 07:43 PM   #2
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What do you mean by ground channel? What does that single opamp do?

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Old 26th November 2003, 03:30 PM   #3
Static1 is offline Static1  United States
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The dual op-amp is for the L&R output channels(stereo). The ground channel op-amp for this circuit would be a single op-amp and usually be the single-version equivalent of the dual op-amp being used.

Example: you would use an OPA2604 for the L&R channels and an OPA604 for the ground channel.

So; I'm just wondering what the actual role of this "ground channel" op-amp actually is?, which is the same question you asked.
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Old 26th November 2003, 09:58 PM   #4
name773 is offline name773  United States
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do you have a schematic handy?
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Old 26th November 2003, 10:35 PM   #5
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Does the amplifier have a dual-rail power supply? If not is the 'ground channel' op-amp there to provide a virtual 0V rail?
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Old 9th December 2003, 06:57 AM   #6
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Does this amp have balanced inputs?

:)ensen.
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Old 9th December 2003, 07:35 AM   #7
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I'll guess it's PPA his talking about.
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