How to Make an Electric Controller With No Transistor

Use a thick sheet of cardboard that doesn't bend too easily. Draw a rectangle, about 4 inches by 3 inches, on the cardboard with a pen. Cut out the rectangular shape from the sheet of cardboard, using a knife or scissors. The rectangle forms the basis for the electric motor controller.

Draw a line 1/2 inch from the top and another 1/2 inch from the bottom on the cardboard, along the 3-inch sides. The area inside the two lines is where you will wrap wire to make the electric controller.

Start from the top line on the cardboard and wind bare copper wire around it; AWG 16-gauge wire works. Leave a few inches of wire loose, extending from where you started to wind at the top line. Ensure the wire is wound tightly, so that each time you wrap the wire around the cardboard the wire is completely up against the previous wire. The idea is to cover the area between the two lines with wire so you can't see the cardboard through gaps in the wire.

Continue to wind the wire gradually down to the bottom line. Wind the wire back up to the top line, then down to the bottom line again, so that three layers of wire are wound tightly around the card.

Cut the wire at the bottom line with a knife. Attach the end of the wire to the cardboard just below the line, using a strip of insulating tape to hold the wire in place so it doesn't unravel.

Cut a strip of plastic coated AWG 16-gauge wire about 12 inches long with a knife. Remove 1/2 inch of plastic off both ends, using wire strippers or a knife. Attach one end of the wire to one end of a thin metal object, such as a nail or paper clip. Hold the wire in place by wrapping a strip of tape around the wire and metal object.

Cut another strip of plastic coated AWG 16 gauge wire about 12 inches. Remove 1/2 inch of plastic off the ends of the wire. Twist one end of the wire together with the loose end of wire that extends from the top of the wire winding around the cardboard. Wrap a strip of tape around the twisted wires to hold them together.

Cut a third 12-inch strip of AWG 16-gauge wire and remove 1/2 inch off the ends. Attach one end of the third wire strip to the negative terminal on the battery; it's labeled "-." Use tape to hold the wire in place. Attach the opposite end of the third strip of wire to the negative terminal on the motor you intend to control. You may need to loosen a terminal screw using a screwdriver and then insert the wire under the screw and tighten. The negative terminal is labeled "-."

Attach the opposite end of the wire that extends from the top of the winded wire to the "+" terminal of the battery using tape. Attach the opposite end of the wire with the metal object on the other end to the "+" terminal on the motor. Use a screwdriver to loosen the terminal screw, insert the wire under the screw and tighten the screw.

Place the end of the metal object at the bottom of the winded wire. As soon as you touch the wire the motor will start to turn slowly. Move the metal object slowly up the wire toward the top of the winded wire. As you move toward the top, the speed of the motor will increase. When the metal object reaches the top, the motor will run at maximum speed. The winded wire creates resistance, reducing the flow of electricity to the motor --- similar to a transistor.