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Document revision 1.1 – Last modification : 10/08/17

SK25 Assembly guide

4. Diodes D5 & D6

Add D5 and D6 on the 2 heatsink PCB's. 
When soldering, be careful not putting any solder on the power transistor 
plane.

Warning

: Make sure to respect the direction of the diodes which is marked by 

a ring on the component and a double line on the PCB marking.

5. Other diodes

These diodes are mounted 
vertically, cathode (black ring) up.
Add D1, D2, D7, D8, D9: 
1N4148, blue on the picture.
Add D4: zener 5.1V, green on 
the picture.

Warning

 : Make sure to respect the direction of the diodes. D7, D8, D9 

are mis-labeled  on the PCB, follow the layout document.

6. LED

Add the red LED D3, red on the picture.

Warning

 : Make sure to respect the long lead/short lead direction of the diode. 

7. Transistors

Add Q1: BC560C  (purple)
Add Q2, Q3: KSA992 (red)
Add Q4, Q5, Q6: BC550C (blue)

Add Q7: BC556C (orange)
Add Q8: BC546C (green)
Press firmly the transistors against the PCB in order to keep the profile 
low.

Copyright ©2014 to Today SoundSkulptor

Summary of Contents for SK25

Page 1: ...e connection between the top and bottom pads is already done The parts must be soldered only from the bottom side unless differently stated Use only small diameter solder 0 5 or 0 7 mm 1mm maximum Use the minimum possible amount of solder Bad joints are almost always caused by too much solder Here are two excellent introduction to soldering videos http www eevblog com 2011 06 19 eevblog 180 solder...

Page 2: ...ed vertically cathode black ring up Add D1 D2 D7 D8 D9 1N4148 blue on the picture Add D4 zener 5 1V green on the picture Warning Make sure to respect the direction of the diodes D7 D8 D9 are mis labeled on the PCB follow the layout document 6 LED Add the red LED D3 red on the picture Warning Make sure to respect the long lead short lead direction of the diode 7 Transistors Add Q1 BC560C purple Add...

Page 3: ... R1 to R13 Warning It is very important to check the resistors value with a DMM because the colour code can be ambiguous For example 1K brown black black brown brown can be confused with 110R brown brown black black brown 10 Capacitors Add C1 and C2 11 Q9 Q10 assembly Attach Q9 BD139 to the heatsink PCB marked Sound Skulptor with a M3x12 mm screw and a M3x20 mm spacer The transistor is placed on t...

Page 4: ...to the main PCB edge then solder the transistor pins Cut the leads sharp Keeping the DOA pressed against the table tighten the 2 screws with a screwdriver 14 Q9 Q10 assembly Solder the 4 pads on both heatsinks These solders improve the mechanical stiffness of the DOA and make the electrical connection of diodes D5 D6 15 R1 Pull R1 back a little in order to avoid its top touching the solder joint o...

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