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HitHats:

Finally, the last instrument to build. Prepare components before beginning assembly. Here is the list of components for HitHat:

Image

Description

Part

Value

Qty

Polyester capacitor (2A152J)

C64*, C65*, C66*, C68*, C69*, C70*

1.5n

6

Polyester capacitor (2A223J)

C67*, C71*

22n

2

Polyester capacitor (2A102J)

C72*, C73*

1n

2

Polyester capacitor (2A471J)

C74*, C80*

470p

2

Polyester capacitor (221)

C79*, C82*

220p

2

Electrolytic capacitor

C60*

10/25

1

Electrolytic capacitor

C61*

47/16

1

Electrolytic capacitor

C81*, C83*

33/25

2

Electrolytic capacitor

C62*, C63*

0.47/50

2

Diode

D13*, D14*

1N4148

2

NPN Silicon Transistor

Q3*, Q4*, Q21*, Q22*, Q23*, Q24*, Q26*, Q27*, Q28*, Q29*, Q30*, Q31*

2SC945

12

PNP Silicon Transistor

Q7*, Q8*

2SA733

2

1/4w Carbon resistor

R1*, R2*, R11*, R12*, R13*, R131*, R154*, R156*

22K

8

1/4w Carbon resistor

R7*, R8*, R130*, R133*, R135*

10K

5

1/4w Carbon resistor

R16*, R17*

4K7

2

1/4w Carbon resistor

R132*, R134*

100K

2

1/4w Carbon resistor

R136*, R145*, R152*

100R

3

1/4w Carbon resistor

R137*, R138*

470R

2

1/4w Carbon resistor

R139*, R148*, R149*, R150*, R151*

1M

5

1/4w Carbon resistor

R140*, R141*, R142*, R143*, R144*, R162*

33K

6

1/4w Carbon resistor

R146*, R155*

68K

2

1/4w Carbon resistor

R147*, R153*

2K7

2

1/4w Carbon resistor

R157*, R158*

47K

2

1/4w Carbon resistor

R159*, R161*

470K

2

1/4w Carbon resistor

R160*

39K

1

1/4w Carbon resistor

R169*, R172*

1K

2

1/4w Carbon resistor

R173*

330K

1

Dual Operational Amplifier

U7

µPC4558C

1

Potentiometer (B205)

VR3*

2MB

1

Potentiometer (A104)

VR7*, VR8*

100KA

2

 


Make it:


Here is the HitHat

Solder all resistors.

Solder each value one after the other.

Solder both diodes 1N4148

MAKE SURE DIODES ARE IN THE RIGHT WAY

Solder polyesters capacitors



Solder electrolytics capacitors

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

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


 

You can then go to Master assembly.