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Old 6th June 2004, 07:07 PM   #1
sam9 is offline sam9  United States
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Default Mirror image IS & VAS BJT amp examples?

Anyone have postable schematics for a BJT output amp with mirror image input and voltage amplification stages?

I'm looking for examples OTHER THAN Slone in order to get some idea of the range of approaches.

Also I'm interested in discrete rather than opamp input sections.

Part off the reason was I was killing time web browsing for these and nothing came up other than Slone, Opamp bases inputs and FET output variations. So I'm left with some conjectures A-the topology is rarer than one might think, B- it's not rare but is deep proprietary secret, C- I just can't come up with the right search string. I vote for "C" as the most likely but "A" and "B" would be more interesting explanations.
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Old 6th June 2004, 08:33 PM   #2
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like this?
http://gilmore.chem.northwestern.edu/dynahi2.gif
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Old 30th June 2004, 01:05 AM   #3
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Originally posted by kevin gilmore
like this?
http://gilmore.chem.northwestern.edu/dynahi2.gif
how do you keep from over biasing the output stage?


Thermal runaway?
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Old 30th June 2004, 01:10 AM   #4
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Tis my understanding that you could use a single diff. amp. circuit and VAS in class A. Then get your current from emitter follower circuit, class AB.

less noise and better stability and less
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Old 30th June 2004, 08:44 AM   #5
thanh is offline thanh  Viet Nam
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Quote:
better stability
Probadly! My orcads also says like that.My amp often failures
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Old 30th June 2004, 09:20 AM   #6
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Check out the "Leach Low TIM Amp"
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Old 30th June 2004, 09:46 AM   #7
sajti is offline sajti  Hungary
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Quote:
Originally posted by cunningham


how do you keep from over biasing the output stage?


Thermal runaway?
Thermal runaway is not real problem with 10ohms emitter resistors.

sajti
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