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Recording head amplifier circuit

2015-01-06 23:58  
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Recording head amplifier circuit
The preamplifier circuit using LM381A is shown in Figure 17.15. LM381A is a dual preamplifier IC which is used to enhance the low-level signal when it is required optimum noise performance. Two sets of amplifier devices are completely independent, the circuit here only uses one group. It contains the power supply decoupling regulator to provide 120dB power supply voltage variation rejection ratio and 60dB channel separation. LM381A can work in wide power supply voltage with range in 9 ~ 40V.