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Author Topic: differential pair amplifier question  (Read 279 times)

NPreston

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differential pair amplifier question
« on: April 13, 2017, 11:59:00 PM »

I am kind of new to amp building and have a decent understanding of amplifying with op apms and single transistors, however I am having trouble really grasping how the differential pair commonly seen in the power section works...  I've tried reading up here and there on the net about it, but I cant say I really know how to make use of this circuit.. I kinda get it, however I dont really understand how to properly set the feedback or how to design for a specific gain etc, set dc at input, single supply vs +/- supply ect..   IN any case, was wondering if anybody knew of any good easy to follow tutorials with examples anywhere??   Something you might see in a text book with various examples??
Thanks

N.
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phatt

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Re: differential pair amplifier question
« Reply #1 on: April 14, 2017, 08:03:04 AM »

Are you aware of Teemu's book? It will help explain it.

https://www.ssguitar.com/index.php?topic=711.0

Also Google Art of Electronics by Horowitz and Hill. I think there maybe a PDF of that book floating around.
It's one of the better books and covers the subject quite well. If you have a basic understanding of analog electronics then A of E will be easy to grasp. ;) 
Heck I failed at maths and even I understood a fair bit straight up.  :tu:
Phil.
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J M Fahey

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Re: differential pair amplifier question
« Reply #2 on: April 15, 2017, 09:12:33 PM »

Agree and add: study how Operational Amplifiers work, since they are a MAJOR building block thereīs tons of books and articles explaining them; which also explain NFB since thatīs the tool to make them do what you want.
And of course the differential amplifier is explained, since it constitutes the input stage of an Op Amp.

Once you understand this, modern SS Power Amps are simple: they *are* an Op Amp !!!!!! ... just a beefy kind, able to drive speakers with high power.,
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NPreston

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Re: differential pair amplifier question
« Reply #3 on: April 16, 2017, 08:18:44 PM »

Thanks for the pointers..  I'll definitely take a look into Op amp insides too when i start catchin on!
 :tu:

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