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(preamp board schematic)
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revers polarity protection BATERY GROUND TO JACK SWITCH
+ Bat ZVP2106 +V
+V D3
S D +V C4
PMOS
R2 T1 1N4007 GND +Vref
D2 +Vref
G
+Vref 10k 8 100n MC33078 C7
R? 1N4007 5 GND
D1 3 MC33078 C13
+V/2 R1
1 U2B
7
J2
C1 0R U2A 6
C2 R3 330k 2 P1
1N4148 TR I Mix point C5 10uF
10k GND A 100n
100uF 100n 4 R14 R9
GND 2,5k 220k B10k
GND 10k Violin OUT
1st string signal C? R11 R12 1uF C6
R13 GND
0R 150pF
2,2k 680k
1uF C12 Gain=22
1n GND
4 OR 5 STRING BRIDGE WITH Mixed out
DEVIDED INDUCTIVE PICKUP +V C?
Gain=309
GND
+V/2 100n
4 GND
L1 3 MC33079 C53
R? 5th string out
1 Pink
2 U1A
J1
0R TR V R10
L3 1 470n R54 100k J3
5th string signal 11 2,5k
2 8-pin CONNECTOR
GND 10k
3
N.C. 4 C? R51 R52 Orange
R53
L4 5 0R Grey
6 2,7k 680k White
7 1,6uF C52 6
Red 5 7
8 680pF +V/2 MC33079
GND
4th string out Yellow
L2 9 5 C43 4 8
10 Gain=251 7
U1B Green 3 1
6 2
TR IV Black
C? 330n R?
4th string signal R41 R42 1st string out Blue
GND 2,5k
10k
4,7k 330k
1,6uF C42 R43 Multi OUT
0R
L1, L2, L3, L4 + Bat 2,2n
(for Synth Module)
DC resistance = 100 R
Gain=70 GND
+Vref 2nd string out
MC33079 C23
10
9V Battery U1C
8
2nd string signal 9
Supply current = 12mA TR II
150n R?
C? R21 R22 BC557 ZVP2106
2,5k top view top view
- Bat 4,7k 680k 10k
1,6uF C22 R?
SW1 0R
R4 1n
C B E S G D
Gain=144
E
10k BC557 Check Batt. GND
R5 B T2 +Vref 3th string out
E
PNP BC557 MC33079 C33
47k R6 B T3 12
14 R?
C
D4 47k
PNP U1D
1N4148 13 0R TR III
C
D6 1N4148
GND 220n R34
R8 3th string signal C? R31 R32
R7 680R 2,5k
10k
1,5k
1,6uF
10k
C32
1M
0R R33
Electric Violin "Cantini Sonplus"
D5 LED
1n
1N4148 A Preamp Board
GND Gain=100 GND
EXTERNAL SUPPLY