Stewart MacDonald bomb boost, Assembly Instructions Manual, Page: 5 / 10

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©2017 Stewart-MacDonald page 5 of 10
JHS Pedals Kit
For Stew Mac
DC Jack
Mini Bomb
C1
C2
Q1
VOLUME
InJ
D8
S
T S
T
R4
R3
R1
R2
D1
OutJ
P78869
Q1 Transistor (J201)
.1J63
JHS Pedals Kit
For Stew Mac
DC Jack
Mini Bomb
C1
C2
Q1
VOLUME
InJ
D8
S
T S
T
R4
R3
R1
R2
D1
OutJ
P78869
R3
R1
R2
C2
Capacitor (.1 µF)
C1
Capacitor (22 µF)
22uF
.1J63
Step 3: Install two capacitors
Step 4: Install the transistor
C1
is a 22 µF polarized capacitor and has to be installed in the right orientation
or it will fail. Note that there is a white stripe running the length of the cap,
identifying the negative (minus) lead. On the circuit board, the circle for this
cap’s location has a thicker line on one side: insert
C1
with its stripe facing
that side. (On polarized caps of this type, there’s a second way to identify the
minus lead: it is the shorter of the two leads.)
Solder cap
C1
in place.
C2
is a .1 µF cap that is not polarized. Solder it in place facing either direction.
Q1
is a JFET* transistor. It is also directional and needs to be installed in a
specific orientation. Note that Q1 has a flat side. On the circuit board, the
location outline also has a flat side. Install this transistor to match its outline
on the card.
*JFET: Junction Gate Field-Effect Transistor