Thiscircuit matches the very high impedance of ceramic cartridges, unity gain, and low impedance output. By `loading` the cartridge with a 2M2 input resistance, the cartridge characteristics are such as to quite closely compensate for the RIAA recording curve.
The output from this preamp may be fed to a level pot for mixing.
EEVblog #629 - How To Design a Microphone Preamplifier
How to Add an Input Impedance Control to Any Mic Preamp
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