Image

Description

Part

Value

Qty

Ceramic capacitor (221)

C70

220p

1

Polyester capacitor (2A103J)

C69

10n

1

Polyester capacitor (104J)

C52

100n

1

Polyester capacitor (2A102J)

C53

1n

1

Polyester capacitor (2A272J)

C54

2.7n

1

Polyester capacitor (2A223J)

C56

22n

1

Polyester capacitor (153J)

C61

15n

1

Polyester capacitor (A682J)

C57, C60

6.8n

2

Polyester capacitor (A563J)

C58

56n

1

Polyester capacitor (2A273J)

C59

27n

1

Polyester capacitor (2A473J)

C63, C65

47n

2

Polyester capacitor (1n8J)

C66, C67

1.8n

2

Electrolytic capacitor

C55

47/16

1

Electrolytic capacitor

C51

0.47/50

1

Electrolytic capacitor

C68

33/25

1

Diode

D54

1N4148

1

NPN Silicon Transistor

Q45, Q47, Q48, Q49

2SC945

4

PNP Silicon Transistor

Q46

2SA733

1

1/4w Carbon resistor

R180, R201, R203

22K

3

1/4w Carbon resistor

R181, R182, R191

10K

3

1/4w Carbon resistor

R183

4K7

1

1/4w Carbon resistor

R184, R185

15K

2

1/4w Carbon resistor

R186

33K

1

1/4w Carbon resistor

R187

330

1

1/4w Carbon resistor

R188, R193

100

2

1/4w Carbon resistor

R189, R204

100K

2

1/4w Carbon resistor

R190, R196

680

2

1/4w Carbon resistor

R192

220

1

1/4w Carbon resistor

R194

2.2M

1

1/4w Carbon resistor

R195

2K2

1

1/4w Carbon resistor

R197

820K

1

1/4w Carbon resistor

R198

1M

1

1/4w Carbon resistor

R199, R207

1K

2

1/4w Carbon resistor

R202, R206

47K

3

Wire or resistor leg

R200

0 ohm

1

1/4w Carbon resistor

R205

27K

1

1/4w Carbon resistor

R210

470K

1

Dual Operational Amplifier

U13, U14

µPC4558C

2

Potentiometer (A104)

VR7

100K(A)

1

Potentiometer (B104)

VR8

100K(B)

1

Potentiometer (B103)

VR9

10K(B)

1

Solder all resistors.

Solder each value one after the other.

Solder D54 diode 1N4148

Solder polyesters capacitors

Solder electrolytics capacitors

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  4558s power supply. 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 !

Solder the 4558. To insert it into the PCB you have to bend the leads a little.

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

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

You can then go to LowTom assembly.