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XC3754 Soldering Guide
Kit Contents
Open up the package and lay out the contents to ensure you have them all. You should
have:
5 Green and 5 Red LEDs
1 Clear LED
4 Resistors (2×220Ω, 1×1kΩ, 1×10kΩ)
2 Capacitors (one ceramic, one electrolytic)
2 ICs (integrated circuits, or “chips”): 555 & 4017, and matching sockets
Header pins, Header cable
PCB board.
Preparing the LEDs
Start by placing one of the LEDs in the circular pads marked out on the PCB board. You
will notice that the circular markings (called the silkscreen) have a flat section, this marks
the negative lead of the LED. You will be able to feel a similar flat section on the base of
the LED with your fingers. You can also notice that one of the LED legs is longer than
the other, which marks the positive.
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