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What are the "Surround" NJM5532DD for in output section of CDP-X303ES
What are the "Surround" NJM5532DD for in output section of CDP-X303ES
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Old 13th August 2019, 08:58 PM   #1
eimis is offline eimis  Lithuania
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Default What are the "Surround" NJM5532DD for in output section of CDP-X303ES

Hello,
My audio circuit comprehension is limited, but the circuitry with the so labelled "surround" NJM5532DDs in the output section seems like some sort of a cross-feed?


What the..? Somebody please explain what this is about
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Old 14th August 2019, 07:37 AM   #2
Mooly is offline Mooly  United Kingdom
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What are the "Surround" NJM5532DD for in output section of CDP-X303ES
No crossfeed or anything like that. The opamps are part of the output reconstruction filter and are configured as 'Gyrators' which allows the synthesising of an inductor using opamps. This can then be used to produce the desired filter response the designer was looking for, all without using real inductors.

The Gyrator

Gyrator Filters
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