2 pieces of wire
2 alligator clips
1 LED
1 variable resistor (pot)
1 small circuit board
solder
soldering iron
Construction:
1) Solder the led onto the circuit board (up in the corner somewhere)
2) Solder 1 of the wires to the + (positive) end of the led
3) Solder the variable resister a few holes away
4) Solder 1 of the prongs from the resistor to the - (negative) end of the led
5) Solder the other wire to the 3rd prong of the resistor (the prong thats on the opposite side of the 2 that are next to each other). Forget the other prong.
6) Connect the aligator clips to the end of the wires
Pop open someones grey, phone box. Clip the Idle box onto the terminals (the light should come on) and turn the pot to where you want it (turn it so that it lets the least electricity pass through). This will make their phone off the hook. Make sure you conceal the BusyBox somewhere. And close the phone box.
In about a minute, hook your beige box up to it and make sure that it has the right amount of resistance. IE: the fone should be off the hook.
