learn to solder:
Skull Badge Kit
Cat no.
KM1090
3
Construction:
STEP 1: RESISTORS
A resistor works both ways so it can be inserted into the
circuit board in either direction. To work out which resistor is
which, you can use a multimeter set to Ohms, or you use the
coloured bands printed on them. The 470 Ohm resistors are
Yellow-Violet-Black-Black-Brown and the 10K Ohm resistors
are Brown-Black-Black-Red-Brown. The Jaycar catalogue also
has a handy colour code chart on the resistors page.
Bend the resistor legs so they can be easily inserted into the
board, and then insert the 470 Ohm resistors into the rear
side of the circuit board marked R1 and R2. Insert the 10K
Ohm resistors into the circuit board marked R3 and R4. Bend
the legs slightly so the resistors won’t fall out when you turn
the board around.
Turn the board around and solder the resistor legs (eight
in total) to the front side of the circuit board. Make sure the
solder joints look like the “volcano” shape we described on
the previous page. Once you have soldered all eight legs you
can trim away the component legs above each solder joint.
STEP 2: BATTERY HOLDER
Insert the battery holder firmly into the rear side of the circuit
board, matching the diagram printed on the circuit board.
Front View
Rear View
Turn the board around and solder the two
legs on the front side of the circuit board.
STEP 3: CAPACITORS
We will now solder in the two electrolytic capacitors, which
only work in one direction so we need to solder them in the
right way. The longer leg on an electrolytic capacitor is the
positive leg and the side with the white stripe is the negative
leg. Insert these capacitors into the rear side of the circuit
board marked C1 and C2. Make sure the long leg goes into
the hole marked with the + symbol.
Solder these capacitors to the circuit board and trim away
the legs.
STEP 4: TRANSISTORS
Insert the two transistors into the rear of the circuit board
marked Q1 and Q2. Make sure you insert them the same
way as printed on the circuit board because they only work
in one direction.
Solder these into the circuit board. Make sure you don’t add
too much solder that you end up causing the solder pads to
join each other. Once you are happy with the solder joints
(six in total) you can trim away the legs.
STEP 5: LAPEL PIN
If you plan to wear this circuit
board as a badge on your
clothes you need to solder on
the lapel pin onto the rear side
of the circuit board. You will need
to apply enough solder here to
make sure it holds securely to the
circuit board.
(+)
(-)
10K
470Ω
