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Question about Differential amplifier.

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ammjy:
Hello,

Thanks you for your time.

I have a question about differential amplifier.

I would like to know what does RC circuit that connected with Vout 1 doing in this differential amplifier.

it is just load might be ?

Please, let me know !

Ian.M:
I would expect a part designated RL to be the load.  The series capacitor feeding RL is to block the DC voltage on the collector of T1.

David Hess:
It is AC coupling the load so I assume this is for an audio application.

Audioguru again:
Many audio amplifier differential amplifier circuits are DC-coupled.

David Hess:

--- Quote from: Audioguru again on November 16, 2019, 05:32:18 pm ---Many audio amplifier differential amplifier circuits are DC-coupled.
--- End quote ---

Sure, but you would not DC couple the output from half of a differential pair because of the large level shift unless you performed a second level shift.  The output from one half has a very large offset.

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