Things You'll Need
Instructions
Strip 1 inch of insulation from each end of the two 8-inch wires.
Slip the end of one piece of 8-inch wire into one of the end lugs of the 50K-ohm variable resistor. Crimp the wire onto the lug with the long-nose pliers. Slip one end of the second wire into the variable resistor̵7;s wiper lug and the remaining end lug. Solder the three connections.
Insert the leads of the triac into the perfboard. Feed one of the 8-inch wires through the perfboard near the triac̵7;s T2 lead. Crimp the wire to the T2 lead on the bottom side of the perfboard. Do not solder this connection yet. Feed the other 8-inch wire through the perfboard near the triac̵7;s gate lead. Crimp this wire to the gate lead, but do not solder.
Insert one lead of the capacitor near the triac̵7;s gate lead. Solder the capacitor lead and wire to the triac̵7;s gate lead on the bottom side of the board. Insert the capacitor̵7;s other lead near the triac̵7;s T1 lead. Crimp the connection, but do not solder.
Insert one wire from the lamp cord with two-prong plug near the triac̵7;s T1 lead. Crimp the wire to the T1 lead, and solder the connections.
Twist the remaining wire from the lamp cord with the two-prong plug together with a wire from the two-prong socket. Screw a wire nut on the twisted wire pair. Make sure that no loose wire strands protrude from the wire nut.
Insert the remaining wire from the cord with the two-prong plug through the board near triac̵7;s T2 lead. Crimp the wire, and solder the connections at the T2 lead.
Use pieces of electrical tape to cover and insulate the exposed lamp cord wiring on the bottom of the perfboard.
Plug an incandescent lamp of 60 watts or less into the lamp cord socket. Insert the plug into a household receptacle. Turn the shaft on the variable resistor; the lamp should brighten and dim.