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by Kailash NR


A switch is a mechanism that removes, restores or diverts the conducting path in a circuit when it is operated. In this guide, we are going to make a simple tap switch to make or break small DC circuits.

    • Scissors have functional sharp edges. Contact may result in injury. Always keep blades away from fingers and body. Handle with care.

    • Be mindful of the battery terminals, they can heat up or momentarily spark if an electrical short occurs.

    • This is a low voltage switch with exposed metal contacts. Do not use this switch with high voltage (higher than 20 volts) sources and or the AC mains.

  1. Using scissors cut the rounded edges of the ice-cream stick.
    • Using scissors cut the rounded edges of the ice-cream stick.

    • Mark and cut the stick into two six centimeter pieces.

    • Mark a line two and half centimeter from one of the ends of both stick pieces.

    • Mark one dot on the center of this line and another one about a half centimeter away from the first. The dots should be made on the longer side of both sticks.

    • Using the scissor tip carefully carve out holes were you marked the dots. These holes need to just be large enough for the wire to go through.

    • Start with two wires that are fifteen centimeters each. Strip two centimeter of insulation off either end of both wires.

    • Run one wire end through one of the holes (the one not on the line) in the stick piece.

    • Now run the same end of the wire through the other hole. This will help secure the wire to the stick.

    • Make sure the are metal is extended on the stick like so.

    • Repeat the same steps for the other wire ans stick portion. You should now have two identical sections.

    • Cut two four centimetre strips of aluminum tape.

    • Remove the paper baking from the tape.

    • Paste the sticky side of the tape around the stick piece such that its making contact with the wire.

    • Warp the rest of the tape on the back side of the stick to secure it.

    • Repeat the previous step on the other stick piece.

    • Cut a piece of foam that's two centimetres by one centimetre.

    • Add a drop of glue to the stick, just behind where the wire is. And stick the foam there.

    • Add one more drop of glue on top of the foam and attach the other stick piece to it.

    • This should be done such that the wire ends are on the same side. And the result should resemble a pair of tongs.

    • Wrap tape around the area behind the foam section where the two sticks meet. Make sure the tape is reasonably tight.

    • Connect the two wires of the switch to the leads of the conductivity probe from Electrical Conductivity. The led does not glow because the switch is the 'open' state.

    • Now by pressing down on the metal contact on one side one can close the circuit and light the led.

    • If the light refuses to light when the switch is engaged. Check the polarity of the LED and each of the connections. Ones can use the LED to check connections to various parts of the circuit.

    • If the LED flickers when the switch is engaged, check the integrity of wire connections and check if the two metal contacts touch each other at multiple points, when the switch is pressed.

Finish Line

Kailash NR

Member since: 05/02/2017

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