Simple Phono Preamplifier

Simple circuitry suitable for moving-magnet cartridges Passive high-frequency equalization. This simple but efficient circuit devised for cheap moving-magnet cartridges, can be used in connection with the audio power amplifiers shown in these webpages, featuring low noise, good RIAA frequency response curve, low distortion and good high frequency transients behavior due to passive equalization in the 1 to 20KHz range. Transistors and associated components provide ±18V supply to the op-amp, improving headroom and maximum output voltage.

R1_________47K 1/4W Resistor R2________100R 1/4W Resistor R3__________6K8 1/4W Resistor R4_________68K 1/4W Resistor R5,R6_______2K7 1/4W Resistor R7__________2K2 1/4W Resistor R8_________39K 1/4W Resistor C1-C3_____100µF 25V Elect

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