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(preamp schematic)
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BATERY GROUND TO JACK SWITCH
+V +Vref
C1 100uF GND C2 R2 10k R? 0R
+ Bat
ZVP2106 Q1
S G D
D3
+V +V
C4 D2 1N4007
EXTERNAL SUPPLY
1N4007 D1
+Vref
3 2
+V/2
R3 10k GND
8
R1 330k 1N4148
GND 100n C13 MC33078 1 U2A 100n TR I R14 10k R13 1uF Mix point C5
+Vref
5 6 MC33078 U2B R9 220k C6 150pF B10k GND 7 10uF P1 C7 GND J2
100n
polarity revers protection
4 GND C? 1uF R11 2,2k C12 1n R12 680k
2,5k 0R
1st string signal
Violin OUT
4 OR 5 STRING BRIDGE WITH DEVIDED INDUCTIVE PICKUP
GND
Gain=22
Mixed out
+V +V/2
4 3 J1 2 1 2 3 4 5 6 7 8 9 10 5th string signal C? 1,6uF R51 2,7k U1A 11 GND R52
C? GND 100n MC33079 1
Gain=309
GND R? 470n 0R 2,5k R53 TR V R54 10k 0R 5th string out Pink R10 100k Orange Grey White Red Yellow Green Black Blue J3 8-pin CONNECTOR
L1
C53
L3 N.C. L4
680k C52 680pF
+V/2
5 6 C?
GND MC33079 U1B R42 330k C42 2,2n 7 330n TR IV R? 2,5k 0R R43 10k 1st string out C43 4th string out
5 4 3
6 8 2
7
L2
Gain=251
1
GND
4th string signal 1,6uF
R41 4,7k
Multi OUT (for Synth Module)
L1, L2, L3, L4 DC resistance = 100 R
+Vref
10
Gain=70
MC33079 U1C R22 8 150n C23
GND 2nd string out
+ Bat
2nd string signal C? 9V Battery 1,6uF R21 4,7k
9
TR II R? 2,5k 10k R?
680k C22 1n 0R
Gain=144
- Bat
Supply current = 12mA
3th string signal C? 1,6uF
GND
+Vref
12 13 R31 10k
MC33079 U1D R32 1M C32 1n 14
C33 R? 0R 220n 2,5k 0R R33 TR III R34 10k
3th string out
Electric Violin "Cantini Sonplus"
Preamp Board
Gain=100
GND