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Topic: Building an Audio Analyzer with Matrices and Mega2560 / Uno and FFT and Op amps (Read 4 times) previous topic - next topic

Aaron_dyer

Does anyone have any good code or schematic using LM386 / LM358 op amps to interface the Arduino Uno or Mega2560 and then to display a nice output on a matrix or matrices for an audio analyzer...I know FFT will need to be calculated....

Magician


dhenry

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LM386 isn't an op amp.


It depends on your definition of opamp. LM386 certainly has the same building blocks as an opamp (linn 3-stage topology) and can be used as one.

Aaron_dyer

My bad, a low power audio amp......still has an inverting and non inverting input....just doesn't run off of - V like a 741 does.......same thing if you ask me.....

Magician

There is  a definition from wiki:
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An operational amplifier (op-amp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.[1]

http://en.wikipedia.org/wiki/Operational_amplifier
Having gain 200 LM386 can't be called op-amp, most regular BJT has more gain.
There is obvious similarity between them, but following this logic we should see no difference between a tiger and a cat, both have a lot in common, four legs, tail etc.

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