Low Noise Microphone preamplifier

This circuit use to raise the gain to reduce noise or amplify the signal. And this circuit use IC OP27 / OP37 , this is precision opertional amplifier ,lower noise , and higher speed with the same input ofset with drift specifications as the OP07 . Both parts have a 10 uV offset , 0.2 uV drift , and 1.8 million gain. Coupled with low voltage noise of 3.5 nV at 10 Hz and a low 1 /f noise corner frequency of 2.7 Hz, the OP27 / OP37 are optimized for accurate amplification of low - level signal.

See schematic and pin configuration below :

Read this circuit »