TRANSISTORS AND TEMPCO RESISTORS
Transistor orientation is vital.
Check that their curved and flat sides match those of the PCB
silkscreen transistor’s outline.
The tempco resistors must be touching the top of the transistor
pairs to be thermally coupled with them and work as intended.
If
you have thermal paste on hand, apply a tiny bit between the
transistor pairs and the tempcos before soldering. Finally, make
sure that the tempco’s leads are not touching the transistor’s
leads.
Qty.
Name – Value
Designator on PCB
2
BC558 matched pair (zip-tied)
(Q1-Q2), (Q3-Q4)
1
BC558
Q5
2
Tempco resistor
(half the size of the others)
– 2k
R24, R36
ELECTROLYTIC CAPACITORS
Polarity is vital.
Check (and double check) that the capacitor’s short leg (
-
) points to
the white semicircle on the PCB silkscreen capacitor’s outline.
Solder them flush with the board.
Qty.
Value
Designator on PCB
2
22µF
C21, C22
Flip the Main Board around
TRIMMERS
Qty.
Name – Value
Designator on PCB
2
3296 type trimmer – 100
R53, R54 (V/OCT Adj.)
POWER HEADER
Orientation is vital.
Make sure that the notch on the power header (yellow line in the
picture) aligns with the drawing on the PCB silkscreen, facing the
inside of the board as shown.
IMÁGENES
- DIY Assembly Manual - rev 1.2 | Page 5