Step 1: INTRODUCTION
The basic idea is that the device consists of two probes which when come on contact make a buzzing sound.
While troubleshooting a circuit the probes are touched to the two contacts which needs to be tested, if they are connected the continuity sensor makes a buzzing sound.
Most multimeters are equipped with a continuity tester but some are too slow or you can make one if you don't have a multimeter on don't like to carry one always
Step 2: THE MATERIALS REQUIRED
The materials you would require are:
1. AAA Battery
2. Buzzer (preferably small)
3. One male-to-male jumper ( or you can use headers or pins)
4. An old thick sketch pen ( of course you can buy a new one if you don't have one)
5. Any pen
6. Some wire
The tools you would require
1. Soldering iron
2. Hot glue or any other adhesive
3. Wire strippers or scissors
5. Sandpaper(100 grit)
Step 3: THE CIRCUITRY
The only difficult part is that you will have to sand the battery contacts before you can solder wires to them.
Also check the polarity of the buzzer. The longer leg is the positive end and the shorter one is the negative end.
Step 4: MAKING THE BODY
The pins or one end of the male to male jumper will become one of the probe and the second end or the second pin will become the second probe.
Step 5: CLOSING THE BODY
The next thing is to poke a hole through the cap you had taken out and thread the other probe through it.
Secure the cap back on and test your circuit.
Step 6: MAKING THE SECOND PROBE
Solder the other end of the male to male connector and then secure it with hot glue at the tip of the pen.
Step 7: TESTING BEEP BEEP
If you don't hear the beeping sound then the circuitry is not working the most common problem being that the connection from the battery is broken.