What is an op amp? Operational Amplifier tutorial & super spy microphone circuit

Afroman goes over the basics of how to use an op amp (operational amplifier) to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone.
LM324 Quad op amp: http://www.amazon.com/exec/obidos/ASIN/B0088VAA80/afromods-20
Circuit diagram: http://www.afrotechmods.com/groovy/amplifier_tutorial/amplifier_tutorial.htm Check out my webpage http://www.afrotechmods.com for more videos about electronics!
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