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

Stereo Synthesizer

This routine efforts to cheer up mono audio resources by replicating a music indication. It does this by changing certain wavelengths between left and right to deceive the ear. It can often generate a acceptable concept music audio to bring some level to otherwise flat sessions. Of course, there is no way to generate real music audio from a simply mono source unless the workstation had a way to tell which route the unique audio came from, but an impression is generally enough for all but the dedicated audiophile. 

 Parts List :

R1                       4.7K 1/4W
R2                      10K 1/4W    
R3                      12K 1/4W    
R4, R6                22K 1/4W    
R5                      11.K 1/4W    
R7                      16K 1/4W    
R8                      100K 1/4W   
R9                      24K 1/4W    
R10                    18K 1/4W    
C1                     0.1uF Ceramic Disc    
C2, C3    2        0.47uF Ceramic Disc    
C4, C5, C7       0.01uF Ceramic Disc    
C6                     0.013uF Ceramic Disc   
C8, C9              4.7uF 25V Electrolytic    
C10                  0.22uF Ceramic Disc   
C11                  47uF 25V Electrolytic    
C12                  100uF 25V Electrolytic    
D1                     LED   
IC1                    TBA3810 (442-794)   
S1                    SPDT Switch   
S2                    power  Switch

Simple Audio Mixer

Mixer Parts List :

R1-8-31-32=3.3K ohms        
R2-7-27-30=100 ohms        
R3-4-9-10=1M ohms        
R5-11-21-22-23-24=10K ohms        
R6-12-15-17=1K ohms        
R13-14-19-20-28-29=47Kohms        
R18-16-25-26=22K ohms        
RV1=2X100K ohms Lin.        

C1-4-7-9-12-17=10uF 16V
C2-8=470nF 63V MKT
C3-24-27-28=100nF 63V MKT
C5-10=10pF ceramic
C6-11=1uF 16V
C13-16-20-21=47pF
C22-23-25=100uF 16V
C14-15-18-19=1uF 63V MKT

IC1=TLC274
IC2=TLC272
IC3=7805
D1=1N4007
D2=LED 3mm
JF3-4=RCA female plug
JF7=female jack 3.5mm mono
JF1-2-5-6=female jack 3.5mm stereo