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Modular Phono Preamplifier Circuit Schematic

2015-01-06 19:29  
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The circuit diagram shows only the left channel and power supply. The circuit has a very high input overload, very low distortion and accurate reproduction RIAA equalization curve, because two op-amp circuit, RIAA equalization network is divided into two parts: an input stage (IC1A) connected in series feedback configuration, implementation bass boost RIAA equalization curve and part of the second stage, to achieve the triple crown cut part of the curve through the second operational amplifier (IC2A) connection in shunt feedback configuration. Some parts in the common channel, not doubled. These parts are: IC3, IC4 C6, C7, C8,,,, C11, C9 C10 D1, D2, and J3. IC1 and IC2 is a dual op amp, so the second half of these devices will be used to correct channel. This module contains an independent power supply Dual Rail also described in the same modular preamplifier control center. This module requires an external 15 - 18 v AC (50 ma minimum) power adapter .

Modular Preamp Phono Module


R1_____________270R  1/4W Resistor
R2_____________100K  1/4W Resistor
R3_______________2K2 1/4W Resistor
R4______________39K  1/4W Resistor
R5_______________3K9 1/4W Resistor
R6_____________390K  1/4W Resistor
R7______________33K  1/4W Resistor
R8______________75K  1/4W Resistor (or two 150K resistors wired in parallel)
R9_____________560R  1/4W Resistor

C1_____________220pF  63V Polystyrene or Ceramic Capacitor
C2_______________1µF  63V Polyester Capacitor
C3______________47µF  25V Electrolytic Capacitor
C4______________10nF  63V Polyester Capacitor 5% tolerance or better
C5_______________1nF  63V Polyester Capacitor 5% tolerance or better
C6,C9__________100nF  63V Polyester Capacitors
C7,C10__________22µF  25V Electrolytic Capacitors  
C8,C11________2200µF  25V Electrolytic Capacitors

IC1___________LM833 or NE5532 Low noise Dual Op-amp
IC2___________TL072   Dual BIFET Op-Amp
IC3___________78L15   15V 100mA Positive Regulator IC
IC4___________79L15   15V 100mA Negative Regulator IC

D1,D2________1N4002  200V 1A Diodes

J1,J2___________RCA audio input sockets
J3______________Mini DC Power Socket


A possible arrangement of the rear panel of this Module
Phono Preamplifier Rear Panel
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