PRE AMPLIFIER CIRCUIT USING JRC 4558

PRE AMPLIFIER CIRCUIT USING JRC (op-amp)

The circuit is use to first Amplifier micro phone signal before its output is fed in to the main power amplifier.

                             The JRC IC used has two embedded OP AMP inside, but only one of the op amps is used. This is connected as a non inverting amplifier. Here, the feedback resistor is 56k ohm, and the input resistor is 1k ohm.

                             The gain of a non-inverting Amplifier using an op amp is given as

A=1+Rf/Rin 

Therefore, the gain of this pre amplifier is

Av=1+56/1=57

COMPONENTS USED

1.       JRC  4558

2.       1K ohm

3.       56K ohm (2)