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Description

Part

Value

Qty

Polyester capacitor (2A473J)

C98

47n

1

Polyester capacitor (2A272J)

C99

2.7n

1

Polyester capacitor (2A333J)

C100, C108

33n

2

Polyester capacitor (2A273J)

C101, C103

27n

2

Polyester capacitor (2A103J)

C102

10n

1

Polyester capacitor (2A223J)

C104

22n

1

Polyester capacitor (2A562J)

C105

5.6n

1

Polyester capacitor (2A102J)

C110

1n

1

Electrolytic capacitor

C109

33/25

1

Diode

D59, D60

1N4148

2

Germanium Diode

D84, D85

1N60

2

NPN Silicon Transistor

Q56, Q58

2SC945

2

PNP Silicon Transistor

Q57

2SA733

1

1/4w Carbon resistor

R267, R277, R278, R282

22K

4

1/4w Carbon resistor

R268, R271

10K

2

1/4w Carbon resistor

R269, R270, R274, R279

4K7

4

1/4w Carbon resistor

R272

3K3

1

1/4w Carbon resistor

R273

15K

1

1/4w Carbon resistor

R275, R283, R285

33K

3

1/4w Carbon resistor

R276

2M2

1

1/4w Carbon resistor

R280

1K5

1

1/4w Carbon resistor

R281

5K6

1

1/4w Carbon resistor

R284, R286

820K

2

1/4w Carbon resistor

R287, R294

1K

2

1/4w Carbon resistor

R288, R289

100K

2

1/4w Carbon resistor

R290

47K

1

1/4w Carbon resistor

R291

470K

1

4PDT switch

SW10

1

Dual Operational Amplifier

U18

µPC4558C

1

Potentiometer (A104)

VR14

100KA

1

Potentiometer (501)

VR15

500R

1

Solder all resistors.

Solder each value one after the other.

Solder D59,D60 diode 1N4148 and germaniums diodes

Solder polyesters capacitors

Solder C109 electrolytic capacitor

MAKE SURE ELECTROLYTICS CAPACITORS ARE IN THE RIGHT WAY

Solder transistors.Do not get confused between 2SA733 and 2SC945  it is not the same transistors.

MAKE SURE TRANSISTORS ARE IN THE RIGHT WAY

Connect the power transformer. Test  4558 power supply before solder. The green dot is-15V, the red dot is 15 V (plus or minus 5%). You have the ground on the potentiometer big square pad . Always check that the four wires from the power supply is well connected.

THEN DONT FORGET TO DISCONNECT THE POWER TRANSFORMER. DO NOT SOLDER COMPONENT AS THE CIRCUIT IS POWERED !

Finally return the PCB and solder potentiometers on the  opposite side of components.

To assembly the switch, solder one leg of the switch and before soldering the other check that it is well pressed against the PCB.

DO NO WRONG IN THE VALUES OF POTENTIOMETERS, BOTH POTENTIOMETERS  ARE DIFFERENT.

You can then go to Rimshot assembly