preamplifier(OPA37) circuit of NAB magnetic head

Published:2011/6/30 2:33:00 Author:chopper | Keyword: preamplifier, NAB magnetic head | From:SeekIC

The picture is a preamplifier circuit of NAB magnetic head.This circuit adopts the magnetic head preamplifier formed by ultra-low noise and precise operational amplifier OPA37.This circuit can offer the standard NAB equal.When the frequency is 1kHz,the voltage amplifition time is 50db.The audio input signal is picked by magnetic head device and it is loaded to in-phase input end of OPA37.This connection method can make the operational amplifier possess high input impedance,that is to say,thepath between pin 3 of OPA37 and ground can be taken as a open circuit approximatively.The load impedance of magnetic head is formed by RL,CL and its resistance and capacity can be determined by the features of magnetic head device.



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