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Description

Part

Value

Qty

Polyester capacitor (2A473J)

C71, C74, C77, C81

47n

4

Polyester capacitor (393K)

C72

39n

1

Polyester capacitor (A682J)

C73

6.8n

1

Polyester capacitor (2A183J)

C75

18n

1

Polyester capacitor (2A563J)

C76

56n

1

Polyester capacitor (2A123J)

C78

12n

1

Polyester capacitor (2A102J)

C83

1n

1

Electrolytic capacitor

C82

33/25

1

Diode

D55, D56

1N4148

2

Germanium Diode

D80, D81

1N60

2

NPN Silicon Transistor

Q50, Q52

2SC945

2

PNP Silicon Transistor

Q51

2SA733

1

1/4w Carbon resistor

R211, R222, R223, R226

22K

4

1/4w Carbon resistor

R212, R213

10K

2

1/4w Carbon resistor

R214, R215, R219, R221, R225

4K7

5

1/4w Carbon resistor

R216

15K

1

1/4w Carbon resistor

R217

3K3

1

1/4w Carbon resistor

R218

2M2

1

1/4w Carbon resistor

R220, R227, R229

33K

3

1/4w Carbon resistor

R224

1K5

1

1/4w Carbon resistor

R228, R230

820K

2

1/4w Carbon resistor

R231, R238

1K

2

1/4w Carbon resistor

R232, R233

100K

2

1/4w Carbon resistor

R234

47K

1

1/4w Carbon resistor

R235

470K

1

4PDT switch

SW8

1

Dual Operational Amplifier

U15

µPC4558C

1

Potentiometer (A104)

VR10

100KA

1

Potentiometer (501)

VR11

500R

1

Solder all resistors.

Solder each value one after the other.

.

Solder D55,D56 diode 1N4148

Solder both germaniums diodes.

MAKE SURE DIODES ARE IN THE RIGHT WAY

Solder polyesters capacitors

Solder C82 electrolytic capacitor

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. 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.

To assembly the switch, solder one lead 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 MiddleTom assembly