High Quality Preamp with Tone Control

Spesification :

• Sensitivity input to output 500 mVef / with load resistor 10 kOhm:

          MD: 2,6 mVef/50 KOhm (@ 1 kHz)
          Tuner 130 mVef/50KOhm
          Tape Player: 130 mVef/50KOhm

• Output Impedance

          1,2 KQ

• Balance Control

         (at 10 KOhm Load) : +3,3 dB
         (Loadless) : +2,3 dB

• Tone Control

         +/- 10 dB at 50 Hz (Low)
         +\- 10 dB pada 10 kHz (High)

• Sinyal/Noise (thd 500 mV€f):

          MD: 65 dB
          Tuner/Tape : 75 dB

• MD Max Input Voltage  at 1 kHz : 200 mvef

          (reflection characteristics of the RIAA)

Schematic

Pcb1

  

Pcb2

Parts  List :

Resistor :
R1,R1',R2,R2',R8,R8',R10,R10' = 10 KOhm
R3,R3' = 270 Ohm
R4,R4' = 560 Ohm
R5,R5' = 10 KOhm
R6,R6' = 120 KOhm
R7,R7' = 220 KOhm
R9,R9' = 22 KOhm
R11,R11'.R12,R12' = 82 KOhm
R13,R13',R14,R14',R17,R17' = 2,2 KOhm
R15,R15',R16,R16' = 47 KOhm
R18,R18',R19,R19' = 100 Ohm
P1/P1' = 100 KOhm log. stereo
P2/P2',P4/P4' = 10 KOhm lin. stereo
P3/P3' = 4,7 KOhm(5KOhm)  lin. stereo

Capasitor :
C1,C1’ = 120 nF
C2,C2' = 47 uF/6,3 V Tantalum
C3,C3',C4,C4',C10,C10',C11,C11' = 15 nF
C5,C5' = 27 nF
C6,C6',C7,C7',C8,C8',C9,C9',C12,C12',C13,C13',C22,C22',C23,C23' = 10 uF/35 V tantalum
C14,C15 = 220 uF/25 V
C16,C17 = 330 nF
C18,C19,C20,C20',C21,C21',C24,C24',C25,C25' = 100 nF
C26,C26' = 22 pF
C27,C28 = 1 uF/35 V tantalum

Semi conductor :
IC1,IC1' = TDA 1034BN, NE 5534N (Philips/Signetics)
C2,IC;',IC;,IC;' = TDA 1054B, NE 5534 (Philips/Signetics)
IC4 = MC 78L15CP (10%) or MC 78L15A CP
           (5%) (Motorola)
IC5 = MC 79L15CP (10%) or MC 79L15A CP
           (5%) (Motorola)
B1   = B40C500

Other Parts :
S1/S1',S2/S2' = bipolar Switch
S3 = On/Off Switch
Tr1 = 2 x 15 V 100 mA Transformator
F1 = 100 mA Slow Fuse