Tuesday, August 14, 2012

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3-Input Mic Preamplifier Circuit Using Op-Amp LM348

This is a 3-input mic preamplifier circuit using IC LM348. The LM348 is a high gain, internally compensated quad operational amplifier with a class AB output stage. The IC has very low input supply current and operates from a dual power supply.
Op-Amp 3-Input Mic Preamplifier Circuit
Op-Amp LM348 Pinout
Out of the four op-amps inside the IC LM348, IC1a, IC1b and IC1c are wired as non inverting amplifiers and they serve as the input amplifiers for the corresponding mic channels. The output of these three amplifiers are tied together and connected to the inverting input of the IC1a which is wired as an inverting amplifier. IC1a mixes the signals from each channel and also works as the output stage.

This circuit from: www.circuitstoday.com 

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