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Operational Amplifier Tutorial & super microphone circuit
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Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone. Don't forget to vote 5!
The final microphone amplifier circuit diagram is here:
For more information about amplifiers, Google "inverting amplifier" "non-inverting amplifier" "instrumentation amplifier" "class A amplifier" "class B amplifier" "class AB amplifier" and that should give you a lot to chew on.
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