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Turn the PCBoard over so that you are looking at the
PLAIN side. From the drawing, find the locations of the components. You will
need to turn the PCB around so that it coincides with the placement sheet.
Remember that you are seeing the copper track through the PCB.
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Identify the values of the three resistors by their
colour bands and/or an ohm-meter. Bend the legs of the resistors to a shape
that will fit into their location holes. Push them through and firm the
resistor down against the PCB.
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The two transistors look the same but are really quite
different. Look for the identifying codes on the body of the transistors.
Offer the transistors into their positions with the flat on the body the way
round that the drawing indicates. Bend the legs to fit into the holes. Push
them in, but allow to stand high off the board.
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Spread the legs of the LED carefully so they spring into its
correct holes. Push the legs just through the PCB so the LED stands high off
the board. You should check that the small flat on the flange at the base of
the globe is the same way round as the drawing shows. The LED is polarised - a
semiconductor - and will not work if placed the wrong way round. The flat is
adjacent to the Negative (K) leg.
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The electrolytic capacitor is polarised. An arrow is
printed on the body pointing down the negative leg. Check the placement
sheet for its polarity and location, push the legs through and solder.
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The disc ceramic capacitor is not polarised so it can go in
either way. Notice that the value of this capacitor is coded on its surface.
This one reads 103. The first and second numbers are value digits and the
third (3 in this case) is a multiplier, viz. indicates the number of zeros
following. This shows a value of 10000 -(1 + 0 + 000). This value is always
expressed in picafarads. Reference to a table will show that this converts to
10 nanofarads, or 0.01 uF.
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These components may be soldered in place.
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Insert and solder the PCB pins.
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The battery snap is sildered with the red wire to the
positive rail, black to the negative rail.
-
Connect a battery and the flasher will commence. The current
draw is very small and the voltage is not critical, so the light will flash
for a very long time from the battery even when the battery is almost
completely flat.
- Trouble shooting will consist of checking locations, polarity, and
soldering.
