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The intercom is simple, an easy-to-build circuit using a single amplifier IC LM386 and a 2N3904 transistor. IC LM386 is most commonly

This is power amplifier circuit using the popular TDA2003. It is used for music amplifier in for car audio. Which it uses the supply voltage from 12 volt car battery. But this circuit adapted for use at home by listening to change power supply to 18 volts. The IC can easily deliver 10W to a 4 Ohms load speaker.

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Estelon X-Diamond

This is Low noise microphone preamplifier circuit using IC-NE5532, M5218P. Simple circuits but high quality balance-Unbalance Input for dynamic microphone

Headphone amplifier circuit with op amp ic OPA134, 2134, NE5532, 5534.

lantern by Zeynep Şeyma Atik, Sema Öztel, Halide Mine Yılmaz