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BassDrum:

We start the serious stuff. It becomes a bit more difficult because of the number of components. Be really careful about what you are doing. If you do not make a mistake when assembly your Yocto work on first power, so patience and attention to details are important.

Here is the part list:

Image

Description

Part

Value

Qty

220pF ceramic capacitor

Ceramic Capacitor (221)

C48

220p

1

Polyester capacitor (104J)

C38, C45

100n

2

Polyester capacitor (A333J)

C39

33n

1

Polyester capacitor (153J)

C40, C41, C42

15n

3

Electrolytic capacitor

C43

33/25

1

Electrolytic capacitor

C47, C49

0.47/50

2

Electrolytic capacitor

C50

1/50

1

Diode

D52, D53

1N4148

2

NPN Silicon Transistor

Q39, Q41, Q42, Q43, Q44

2SC945

5

PNP Silicon Transistor

Q40

2SA733

1

1/4w Carbon resistor

R152, R160, R168

22K

3

1/4w Carbon resistor

R153, R154, R172

10K

3

1/4w Carbon resistor

R155, R162

4K7

2

1/4w Carbon resistor

R156, R161, R167

1M

3

1/4w Carbon resistor

R157

8K2

1

1/4w Carbon resistor

R158

2K7

1

1/4w Carbon resistor

R159, R163, R174, R176

100K

4

1/4w Carbon resistor

R164, R165, R169

47K

3

1/4w Carbon resistor

R166, R173

6K8

2

1/4w Carbon resistor

R170

470K

1

1/4w Carbon resistor

R171

220R

1

1/4w Carbon resistor

R175

1K

1

1/4w Carbon resistor

R177

82K

1

Dual Operational Amplifier

U12

µPC4558C

1

Potentiometer (A104)

VR4

100KA

1

Potentiometer (C103)

VR5

10K(C)

1

Potentiometer (B504)

VR6

500K(B)

1

 


Make it:

Here is the BassDrum. You see that there are more components than in the previous section, this is why you must be careful that you do.

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 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  Snaredrum assembly