MECHANICAL DETAILS
CHECKING YOUR PCB
Carefully check the following before you insert the batteries:
All holes (except the 4 large (3 mm) holes in the corners) are filled with
the lead of a component.
All these leads are soldered.
Pins next to each other are not soldered together.
The shape of the transistors and thyristors match the outline on the PCB.
The notch on IC holders ICs and PCBs all match.
The flat edge of each of the LEDs matches the outline on the PCB.
The colour bands on R4 and R6 are red, red and brown.
The red wire on battery clip goes to Power ‘+’ and the black to power ‘–’.
The red wire on buzzer goes to Buzzer ‘+’ and the black to Buzzer ‘–’.
The switch with the black button is connected to Reset.
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Check the bottom of the board to ensure that:
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Check the top of the board to ensure that:
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Dimensions in mm
43
30
12.5
60
17.5
4
4
