Old CDs that we don't use, usually take up space and we often throw them away, being useful elements to re-use them in other simple assemblies, as is the case of creating switches that can be used in the creation of different circuits, or to activate devices or toys. In this article, we will look at how to make a switch out of old CDs and give a new use to the CDs we are about to throw away.
In order to carry out our CD-based switchwe will need the following materials:
- A couple of old or broken CDs.
- A copper foil.
The first step in realising our switchis to take a CD and draw two silhouettes of it on a sheet of copper with the help of a pencil.
Then, we cut them with the help of a scissors or knife until we obtain two copper discs, which we are going to glue on the bottom of each CD to obtain a conductive surface that will be the contact of our CD. switch.
Next, we let them dry so that the gluing process is carried out correctly and the copper discs do not become detached from the CD's. Once dry, we take two wires and with the help of a knife, we remove the protective bark from one end of each wire, so that they can be used as contacts. Once dry, we take two wires and with the help of a knife, we remove the protective bark from one of the ends of each wire, so that they can be used as contacts.
Having the contacts free, we proceed to glue them to each conductive foil located at the bottom of each CD, thus making the moving parts of the switch.
Now, we use a bit of velcro on each of the CD's to keep a prudent distance between them, and thus avoid a short circuit. Once this is done, we place one disc on top of the other with the conductive sides facing each other and our switch is ready.
To test the switchIf we connect it to any circuit or toy and press one CD on top of the other to activate it. When pressure is lifted on the top CD, the switch will open and the current flow will stop.
How it works
The two copper plates are electrically conductive. Once they are in contact, the energy that is transmitted through the wires flows without any resistance and closes the circuit in which we have installed the switch. When the switch is turned off, the flow of electricity will cease and the circuit will remain open preventing the flow of power.