Balanced Operation

gchrist · 21st July 2003, 01:09 PM

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?

Thanks
George

Holger Barske · 21st July 2003, 01:23 PM

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.

21st July 2003, 01:09 PM	#1
gchrist diyAudio Member Join Date: Mar 2002 Location: Athens Greece	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? Thanks George

21st July 2003, 01:23 PM	#2
Holger Barske diyAudio Member 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 www.holgerbarske.com

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