Inside of the operational amplifier

425

05:32:11

It is inside of a op-amp(without amperage regulation). It amplifies from .4v to 8v. It is an "Inverting" amplified circuit. 

published 10 years ago

thebugger

10 years ago

36W in 2ohms impressive for an opamp. I'd say its more like an integrated class AB amplifier. Proper negative feedbacks differential amp for the crossover distortions basically everything. Good topology.

thebugger

10 years ago

I presume every low power low distortion transistor will work for the small signal ones. For the power transistors maybe tip41 tip42? Just put a rheostat in the negative feedback to adjust the gain.

rbrtkurtz

10 years ago

They're called power op amps, bro. The LM675 is the first one that comes to mind for me. I don't think it'll quite push 4A, but there are plenty that will. I believe Texas Instruments makes a bunch of models that deliver in excess of 10A.

thebugger

10 years ago

Nevertheless a good internal circuit. Then why do IC amps sound worse than low quality basic transistor amps. In their datasheets the THD levels are often very high. Is it from the fact that the internal circuit is so cramped up that parasitic effects increase to the point it influences the overall quality.

rbrtkurtz

10 years ago

lol not a power amplifier. A power op amp. Typically, you'd consider a TDA2030A a power amp (for audio use). An LM675 is a power op amp. Slight differences in nomenclature, similar concepts concerning how they work, but big differences in what they're used for. I'm sure an LM675 (or any other power op amp) would be complete garbage for audio use, since it is typically used to create a split voltage supply from a single positive source.

rbrtkurtz

10 years ago

Op Amps do much, much more than amplify audio.

rbrtkurtz

10 years ago

And yes, it's a very good demonstration of the basics of op amp IC intervals. Kudos, @Voltransistor.

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