MOOD%20LIGHT%20PCB%20ASSEMBLY

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MOOD LIGHT PCB ASSEMBLY
V.2.2 - By Phil Townshend 2008
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ASSEMBLING THE PCB
Hold up the PCB as shown below try to locate
the holes shown
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RESISTORS
The first component is a resistor value 1Kohm,
(brown, black, red). It is not important which
way round it goes.
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RESISTORS
The next 2 resistors are 22 ohms, (red, red,
black).
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RESISTORS
The last 2 resistors are both 47 ohms, (yellow,
violet, black).
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IC HOLDER
Insert the IC holder with the notch at the top as
shown below.
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CAPACITOR
The first capacitor is 100nF in value (104
written on it). It can be inserted either way
round.
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CAPACITOR
C2 must be inserted the correct way round. The
longer lead is the positive one. Insert into the
top hole with the silver stripe downwards.
PositiveLongerLeg
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MULTICOLOUR LEDs
D1 must be inserted with the flat section on the
rim facing right. This is normally the red/blue
type. Insert them most of the way into the PCB.
Flat side
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MULTICOLOUR LEDs
D2 must be inserted the same way this is the
red/green type. You can put either LED in either
place, it just means the colours cycle in reverse.
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FUNCTION SWITCH
Strip about 8-10mm of insulation from a 100mm of
wire and twist the strands together. Make
another, then insert them into the PCB and
solder.
Feed the wires back through the PCB as shown to
prevent them breaking.
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POWER LEADS
Connect a single red wire about 150mm long to the
top hole and solder. Feed the black wire from the
battery clip, UP through the large hole first,
then solder.
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SWITCHES
There are 2 switches the toggle switch for
power and the push-to-make switch for the
function. Connect as shown below.
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INTEGRATED CIRCUIT
Finally insert the IC making sure the notch is at
the top. Try not to bend the pins and ensure
they are all inserted correctly.
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ASSEMBLY NOTES
Both LEDs should light up red to start with. If
they are green or blue, then the flat rim is
facing the wrong way and colours will not be
displayed correctly. The LED should be unsoldered
using a de-solder pump, or by carefully heating
up all 3 pads at once. Then rotated 180º and
re-soldered. Clear the holes before inserting
them. Another way to identify the orientation of
the LEDs is that the shortest leg faces
left. Common faults are pads shorted with solder
bridges. Carefully use an iron or de-solder pump
to clear them. If only one LED comes on and
stays on, the IC is the wrong way round.
Disconnect power immediately and insert the IC
correctly. The maximum voltage the circuit can
handle is 5v. After this outputs on the IC start
to struggle and above 6v will destroy the IC
completely.