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Ever wonder how op-amps work? Have you heard the term, but are unsure of how to use them? This kit, based on the LM1458 Dual Op-Amp, fills you in on op-amp basics and provides a working preamp, capable of amplifying mic-level signals to the point where they can drive a power amp. Featuring two high-gain stages, each with an adjustable output level. The stages can be connected together to provide one high-gain preamp, or used separately for stereo.