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20th January 2011, 10:49 AM
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diyAudio Member
Join Date: Aug 2007
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lm387 made od discrete components
Hello This little amplifier is from a radio receiver.
I wish to replace the chip with an amplifier made of discrete components and achieving the same overal gain and maybe better noise, distortion and intermodulation characteristics. The 120mH coil and associated caps form a high pass filter to cut off the 50Hz hum. I would like to keep this passive filter there as well as the mute switch, so I basically need 2 amplifiers made out of discrete components. One with gain 27dB for the front end and another one with gain 35dB for the back end. Can this be done? any schematics?
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