Preamplifikatör
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 Electrolytic Capacitors
C4,C5______47nF 63V Polyester Capacitors 5% tolerance
D1,D2__BZX79C18 18V 500mW Zener Diodes
IC1_______LM833 Low noise Dual Op-amp
Q1________BC337 45V 800mA NPN Transistor
Q2________BC327 45V 800mA PNP Transistor
J1__________RCA audio input socket
Technical data:
Sensitivity @ 1KHz: 2.5mV RMS input for 200mV RMS output
Max. input voltage @ 1KHz: 120mV RMS
Max. input voltage @
10KHz: 141mV RMS
Max. input voltage @ 20KHz: 127mV RMS
Frequency response @ 1V RMS output: 100Hz to 20KHz ħ 0.5dB;
-0.75dB @ 30Hz
Total harmonic distortion @ 1KHz and 6V RMS
output: 0.006%
Total harmonic distortion @10KHz and 1V RMS
output: 0.02%