Hello, this is a quick but useful instructable on how to create a mini speaker using an old headphone/earphone aux (jack) and a broken toy that uses sound. All you need as well as a soldering kit. This is useful for a Raspberry Pi laptop or a device that doesn't have a speaker or the speaker is broken.

Supplies

What you definitely need:

An old toy that has a speaker inside it

An aux cable (it doesn't matter where it came from)

A soldering kit

Scissors (anything pointy or sharp)

Optional:

sellotape

Step 1: Breaking Down the Old Toy

Make sure the speaker on the toy works before breaking it. I just simply unscrewed everything from the toy and found a speaker like in the picture (it doesn't look like one) and pried it out of its casing and ripped the wires connecting the speaker from it to the toy (leave the end where there are two wires coming from the speaker, just break off the other ends). Cut the speakers wires so they are equal length and strip off the rubber coating so there is some bare wire showing by scraping it off with a pair of scissors. You can screw the toy back if you want but you can do anything you want with it.

Step 2: Taking of the Aux Cable

I found some non-working earphones I got for free on a bus tour and cut the wire of where the audio jack is. The earphones were really cheap and tacky so I got a pair of scissors and tared the rubber coating underneath the jack. You can cut the thin wires connecting to it and make sure that you have completely taken off the jack so you only see the metal plug.

Step 3: Soldering Them Together

Place your speaker and your jack next to each other and plug in your soldering kit to the wall and switch it on. Put the soldering iron in the holder so it doesn't burn anything. Wait for 5 minutes for it to heat up and while you are waiting, put some gloves on just in case you touch your skin with the hot part. Once it's hot, get any of the two wires that the speaker is connected to and place them on the rim of where the rubber used to be (where there used to be a thin metal wire protruding from but you snipped it off) and get the metal coil that you are supposed to melt and melt some onto the hot soldering stick. Carefully place down and wipe the blob of metal and push the wire into it to let it melt. Leave the wire in the metal for 10 seconds till it's dried. Do the same for the other wire except anywhere on the bar at the bottom of the aux (at the bottom opposite where you plug it in) and do the same as before. Onc it has dried and cooled down, plug in the speaker into the headphone jack on any device that earphones work on and put it on full volume to test if it works. If it doesn't then you must have soldered it wrong or the aux cable is broken somehow (very unlikely).

Step 4: Protecting the Wire and the Speaker

Simply just get sellotape and carefully wrap it around the wires and where they are soldered to. Create a really thick layer to make sure it doesn't break. You could stick it to a rasin box as they are small, cut a hole where the sound should come out from (the side where there is a plastic film with a small coil) and stick it their. Poke the audio jack out of the box from a hole and glue or stick it down.