http://www.zpag.net/Electroniques/Audio2/2sc945_quadraphonic_decoder.html
The C945 is an age old Japanese Bipolar audio frequency NPN transistor. It has a decent gain value (hfe) of maximum 700 and is highly linear. Hence it was widely used in amplifier applications for pre-amplifying purpose, in high frequency circuits.
The 2SC945 NPN General Purpose Transistor is an audio frequency amplifier high-frequency OSC NPN transistor.
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The Dynamic Microphone Preamplifier circuit. So low noise signal,use three transistor (2SC945, or 2C1815 or 2SC828) is transistor amplifier with a low noise
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