Construction
Start kit construction by identifying the component side of the printed circuit board (PCB). The component side has the white line drawings of the resistors, transistors, diodes, IC's and DB9 connector. All components are mounted on the component side. In general after soldering a component to the board, clip away any excess wire from the underside of the printed circuit board. Follow the sequence for mounting the components as outlined. Start by mounting and soldering the 100K resistors (color bands brown, black, yellow, gold or silver) labeled R1 through R10.
Next mount the 3.3K, 1K, 4.7K, 10K, and 300 ohm resistor (R11). For the color bands of the preceding resistors see resistor color code appendix. Mount the red LED labeled D1 on the board. The positive lead of the LED is the longer lead. The positive lead of the LED is mounted in the + label . Next mount the 18 pin socket for U1. Mount and solder the DB-9 right angle connector, labeled P-1. Mount the On-Off (SW1) switch and the LM2940 (Q11) +5 V voltage regulator. Mount and solder the five TIP120 transistors (Q1 to Q5) and the five TIP125 transistors (Q6 to Q10). Mount and solder C1 (100 uF) and C2 (10 uF) capacitors, keeping the positive terminal of the capacitor orientated as shown in the drawing above. Next mount and solder the 4 Mhz crystal and two 22 pF capacitors. Finish the project by mounting and soldering the 8 position 3 inch Molex connection cable starting with the red wire being placed in the first hole next to on-off switch, Q12 (2N3904 transistor) and the 5.1 V Zener diode, orientate the diode as shown in the drawing above. Mount the preprogram 16F84 chip into the 18 pin socket.
