Circuit Description - Casio EG-5 Service Manual

Electric guitar
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Pickup
The pickup is a humbacking pickup, which consists of the two coils connected in series opposition. Each coil
has the same turns but it has the opposite polarity of the core to the other one.
Noise
Signal
Hum Cancel Circuit
By adding two outputs from the pickup, the hum cancel circuit removes a hum noise, it also doubles amplitude
of the signal.
Distortion Circuit
The distortion circuit adds a distortion effect to the original signal from the pickup. The circuit cuts off peak of
the waveform, it also produces a sound signal like a howling sound.
Head Amp. (TA8142AP)
The internal block diagram is shown in Figure 5.
PIN1
1
2
PNF1
PNF2
7
PIN2
8

CIRCUIT DESCRIPTION

Noise
N
Output2
S
Humbacking Pickup
< Figure 4 >
POt1
GND
3
12
Ch1
Vref1
Iref
Ch2
5
6
POt2
VCC
< Figure 5 >
— 8 —
Noise
S
Output1
N
Signal
ROt1
11
Ch1
Vref2
ALC
Ch2
4
14
ROt2
CG
RFN1
10
9
RIN1
ALC
13
RIN2
16
15
RNF2

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