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LM358 microphone amplifier

After the unconvincing performance of the LM386 mic amp, another design is put to the test. This time, based around a LM358 operational amplifier.

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The Min-Max sketch

This sketch is a simple extension to the most-basic analogRead() example.
Instead of printing every single value read, it performs a series of 10000 reads of analog pin 0. Then it prints the minimum and maximum values sampled, as well as the span of values: Delta = Max – Min.

With this approach, the Serial Monitor does not get flooded with data and more time is spent in reading values, than in transferring them over Serial.

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LM386 microphone amplifier

In this schematic, a LM386-based audio amplifier takes its input from an electret microphone.

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