INSTALLATION:
Just install (and solder) the components to the PCB according to the table below.
ITEM
COLORFUL FLASHING CHRISTMAS TREE ELECTRONIC KIT
PRODUCT CODE: AK27014
DESCRIPTION: This very fun and simple circuit creates a beautiful display.
The twelve tri-color LEDs (L1 to L12) will flash in a colorful and random manner.
TO AVOID PROBLEMS, PLEASE READ CAREFULLY BEFORE ASSEMBLY:

Use a low wattage (15W to 30W) soldering iron with a fine pointed tip.

Observe the correct installation of polarized components. (LEDs & Diode)
1.
On the LED components, the longer leg is “+”.
2.
On the PCB markings, the square pad (as shown in Figure 1) is always “+”.
3.
Install the diode as shown in Figure 2.

Do not insert the LEDs flush to the board. Leave some space as shown in Figure 3.

9V battery clip: Red wire solders to B+ and Black wire solders to B- .
To provide some strain relief for these wires, tie a small knot in each wire after
it has passed through the neighboring hole before soldering. (See Figure 5).

Install each component over the silk screen outline on the circuit board, then solder the
component leads to the PCB pads from the opposite side of the board.

After soldering each component, clip off excessive lead length as necessary.
(Short enough to prevent component leads from touching each other).

After assembly is completed, the circuit may be powered with either a 9V battery, or
DC power adaptor PS0904U. (Battery and power adapter not included).
.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
PCB
SYMBOL
R1
R2
R3
R4
R5
R6
D1
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
SWITCH
DCJACK
B+, B-
DESCRIPTION
IDENTIFICATION
RESISTOR, 330 ohms
RESISTOR, 330 ohms
RESISTOR, 330 ohms
RESISTOR, 330 ohms
RESISTOR, 330 ohms
RESISTOR, 330 ohms
DIODE, IN4001
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
SLIDE SWITCH
3.5mm MONO JACK
9V BATTERY CLIP
ORANGE, ORANGE BROWN
ORANGE, ORANGE BROWN
ORANGE, ORANGE BROWN
ORANGE, ORANGE BROWN
ORANGE, ORANGE BROWN
ORANGE, ORANGE BROWN
BANDED CATHODE
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
LONGER LEG IS +
6 LEGS
FIGURE 4
RED WIRE, BLACK WIRE
CIRCUIT EXPLANATION:
Below is a brief explanation of the circuit diagram shown in Figure 6.

Diode D1 protects against accidentally connecting the power supply in reverse polarity.

The function of resistor R1 is to limit the current flow through LEDs L1 and L2. Too much
current would damage the LEDs. (Resistors R2 through R6 perform a similar function as R1).

The LEDs flash independently because there is also a timer IC built into each LED.
CIRCUIT DIAGRAM:
FIGURE 1
FIGURE 2
FIGURE 4
FIGURE 5
POLARITY
IMPORTANT?
NO
NO
NO
NO
NO
NO
YES (FIGURE 2)
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
FIGURE 3
FIGURE 6