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DCI1 • 13
1. Locate and install J1, one of the green 2 screw terminal jacks. The
open holes should face outward from the center of the circuit board. These
holes are where you will interface your external wiring to the relay contacts.
2. Install J2, one of the green 2 screw terminal jacks.
3. Install J3, one of the green 2 screw terminal jacks.
4. Install J4, the last green 2 screw terminal jack.
5. Identify and install the power connector J5, the 2.1 mm DC power jack
at the edge of the PC board. Gently slide the leads through the component
side of the circuit board until the connector is mounted flush. Solder all
three connections using enough heat to flow the ground connection
completely.
6. Install D5, a 1N4004 diode (black with
white band). The body of the part should
be placed in the hole with the silk-
screened circle around it. The banded
end should be away from the board and
the wire lead needs to be bent over to into
position for the other hole.
7. Install D6, another 1N4004 diode. Watch its orientation!
8. Install D7, another 1N4004 diode. No more reminders, you should
know by now that diode orientation is critical.
9. Install D8, another 1N4004 diode. Again, watch its orientation (sorry, I
had to do it)!
10. Install Q1, a three leaded transistor marked 2N3904. The flat side must
be placed as shown on the PC board silkscreen. Look at the Parts Layout
Diagram for further clarification. When you insert it, mount it as close to the
board as possible without forcing it.
11. Install Q2, another 2N3904 transistor.
12. Install Q3, can you guess? Yup… another 2N3904.
13. Install Q4, the last 2N3904 transistor used in the relay control circuit.
14. Install R1, a 10K ohm resistor (brown-black-orange). Save a few of the
clipped off wire leads from the resistors. We’ll use them to construct jumper
wires JMP1 and JMP2 later.
15. Install R14, a 100 ohm resistor (brown-black-brown).
16. Install R5, a 10K ohm resistor (brown-black-orange).
17. Install R15, a 100 ohm resistor (brown-black-brown).
Cathode
Anode