Hobbies And Interests
Things You'll Need
Instructions
Add the 14-pin IC socket to the prototyping circuit board. Plug the 18-pin IC socket into the circuit board such that it is in the center. Use the rosin core solder and the soldering iron to solder the pins to the circuit board traces.
Plug in the 4001 CMOS Quad 2-input NOR gate IC. Review the data sheet for the chip to find pin 1. Insert the chip into the IC socket such that pin 1 is at the same end with the "u" molded into the socket.
Add the resistors to the board. Clamp the tip of the needle nose pliers at one end of a resistor, and bend the lead at a 90-degree angle. Repeat this process for all the remaining leads of each resistor. Insert the resistors while separating them at least one hole space from each other, and solder each lead to the board.
Add the capacitor to the board. Insert the capacitor leads through the board holes and solder in place. It should not connect with any other component yet.
Insert the LEDs into the circuit board. Create a row of LEDs on the circuit board in the order of red, green, and yellow. This row should either be at one end of the 14-pin socket or parallel to its length. Solder each lead to the circuit board.
Connect the capacitor. Use the wire cutters to cut a length of wire long enough to reach one lead of the capacitor and pin four of the 4001. Cut another length of wire long enough to reach the other lead and pin eight of the 4001. Use the wire strippers to remove about one-half inch of insulation from each end. Solder these wires to their respective places.
Connect the "HI" LED circuit just as you did in the previous step. Prepare a length of wire to connect between one of the 1-kiloohm resistor leads and the anode of the red LED. Create another length of wire to reach between pin 3 of the 4001 and the cathode of the red LED. As a reminder the cathode is marked with a short lead and often a flat side on the LED packaging. Connect the free end of the 1-kiloohm resistor to pin 14 of the 4001 with a piece of wire.
Connect the "LOW" LED circuit. Prepare and solder a length of wire to connect between the anode of the green LED and pin 3 of the 4001. Create and solder another piece of wire to connect between the cathode of the green LED and one lead of an unused 1-kiloohm resistor. Connect the free end of the 1-kiloohm resistor to pin 7 of the 4001.
Connect the "PULSE" LED circuit. Solder a length of wire between the cathode of the yellow LED and a free lead of the sole unused 1-kiloohm resistor on the circuit board. Connect another piece between the anode of the yellow LED and pin 14 of the 4001. Use another piece of wire to connect between the free end of the 1-kiloohm resistor and pin 11 of the 4001.
Finish all the other connections between components on the board. Bridge a piece of wire between one lead of the 2.2-megaohm resistor and pin one of the 4001. Connect another piece of wire between the unused lead of the resistor and pin three. Solder individual wire pieces between one lead of the 4.7-megaohm resistor and pin 14 and from the other lead to pin eight. Connect pin one to pin two, pin three to pin five, pin six to pin 10, pin eight to pin nine, and pin 12 to 13.
Connect the probe lead to the circuit board. Cut, strip, and solder a length of 22 AWG solid wire to both the metal probe lead and pin one of the 4001. The wire should have a little play in it to make it easier to put the assembly into the project enclosure.
Connect the alligator test leads. Cut off both a red clip and a black clip, cutting as close to the clip as possible to preserve the maximum amount of wire. Strip about one-half inch of insulation from each wire end. Solder the red wire to pin 14 of the 4001 and solder the black wire to pin seven of the same chip.
Clean up the circuit board. Clip the excess lead ends with the wire cutters. Each lead should be flush with the top of its respective solder cone. When finished, spray all the solder joints with flux cleaner.
Place the assembly in the enclosure. If necessary, use wire cutters to clip away at excess circuit board material. Be careful not to disturb any of the components soldered to the board. The resulting product should have a metal probe lead protruding from one end and the alligator clip leads hanging out from the other end. The three LEDs should be visible to the user from inside the enclosure.