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MiddleTom:

Here is the part list  of Middletom, prepare all components before assembly:

Image

Description

Part

Value

Qty

Polyester capacitor (2A473J)

C84

47n

1

Polyester capacitor (2A333J)

C85, C87

33n

2

Polyester capacitor (2A272J)

C86

2.7n

1

Polyester capacitor (153J)

C88

15n

1

Polyester capacitor (2A822J)

C89

8.2n

1

Polyester capacitor (2A273J)

C90, C91

27n

2

Polyester capacitor (2A123J)

C92

12n

1

Polyester capacitor (393K)

C96

39n

1

Polyester capacitor (2A102J)

C97

1n

1

Electrolytic capacitor

C95

33/25

1

Diode

D57, D58

1N4148

2

Germanium diode

D82, D83

1N60

2

NPN Silicon Transistor

Q53, Q55

2SC945

2

PNP Silicon Transistor

Q54

2SA733

1

1/4w Carbon resistor

R239, R260

1K

2

1/4w Carbon resistor

R240, R249, R250, R255

22K

4

1/4w Carbon resistor

R241, R242

10K

2

1/4w Carbon resistor

R243, R244, R251, R252

4K7

4

1/4w Carbon resistor

R245

15K

1

1/4w Carbon resistor

R246

3K3

1

1/4w Carbon resistor

R247

2M2

1

1/4w Carbon resistor

R248, R256, R258

33K

3

1/4w Carbon resistor

R253

2K2

1

1/4w Carbon resistor

R254

6K8

1

1/4w Carbon resistor

R257, R259

820K

2

1/4w Carbon resistor

R261, R262

100K

2

1/4w Carbon resistor

R263

47K

1

1/4w Carbon resistor

R266

470K

1

4PDT switch

SW9

 

1

Dual Operational Amplifier

U16, U17

µPC4558C

2

Potentiometer (A104)

VR12

100KA

1

Potentiometer (501)

VR13

500R

1

 


Make it:


Here is the MiddleTom.

Solder all resistors.

Solder each value one after the other.

Solder D57,D58 diode 1N4148

MAKE SURE DIODES ARE IN THE RIGHT WAY

Solder both germaniums diodes.

 

MAKE SURE DIODES ARE IN THE RIGHT WAY


 

Solder polyesters capacitors



Solder C95 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. 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 4558s. 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 HighTom assembly