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Balanced Operation
Balanced Operation
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Old 21st July 2003, 02:09 PM   #1
gchrist is offline gchrist
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Join Date: Mar 2002
Location: Athens Greece
Default Balanced Operation

Dear fellows,

I am reading the Balanced line stage article from Pass but I have this question to make:

The circuit does not amplify any portion of the signal which is the same at both inputs. It will only amlify the difference of the two imputs.

Question: The two inputs are with opposite phase. Will the difference between them always be zero? Then what does the circuit amplify?

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Old 21st July 2003, 02:23 PM   #2
Holger Barske is offline Holger Barske  Germany
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Join Date: Jan 2001
Location: Ruhrgebiet
Not the difference is zero, the sum is
The difference ist what is amplified.
If you would simply subtract both inputs, you would get a result wich has double amplitude of one of the both inputs.
Best regards: Holger
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