That moment when you overamplifiy your speaker, the speaker can't handle it, and the negative side of the aux port gets way too much energy delivered.
Now whenever I put an aux cable into the phone, it restarts 3 times hahaha shit

PS: I put the transistor and the power delivered from the Arduino board away.

At least you now have a solution in case your phone's power button kicks the bucket

Update: I have tested it with my old laptop. Without any extra amplification.
It also doesn't play music now.

The speaker itself has no capacitor built in. So we can exclude amplification within the circuit that has been left. I extra checked it with a multimeter. It should be working fine.
Plus and minus isn't directly connected.

@encore xD that's true

After a restart the laptop is playing music again. Seems like that circuit temporarily destroys the devices lol.

PS: That speaker is from the destroyed TV from my previous "rant": https://devrant.com/rants/1268275/...

@Floydian :DDDDDDDDDDD

I didn't find any better tag for it. It was just perfect :D

Phones cant drive speakers directly, those speakes have too low impedance for that. You need to use a amplifier.

@Gregozor2121 tried that with a bipolar transistor and 5 volts

@Gregozor2121 base = audio, collector = 5 volt

@Gregozor2121 but I made a stupid mistake and set the ground to the ground of the aux cable.
So the phone had to deal with 5volt * [amount of audio signal in volts].

Holy damn that is NOT how do you make a amplifier! The easiest solution would be to buy a prebuild module on ebay 1-2$. If you had build it correctly you wouldnt destroy your phone! You forgot about capacitor that would block all DC comming from and to you phone. One small transistor isnt enough to drive a speaker of this size as well!

Well you need to learn a lot about electronics...
PS. I always use my old phone to play audio so i wont damage the phone i currently have

@Gregozor2121 my phone is not dead. In fact, I used this phone to take the thread's pic and post it. And rn I'm also using the phone.

@Gregozor2121 Ik that I made a stupid mistake. Without planning, I began to connect them.
Not like Idk how to properly plan them, but I couldn't hold it no longer in.
Looked up the solution to it. I will rather buy a built amplifier that I can take everywhere with me.

My phone still plays music. Don't worry. It was just a temporary blackout of the device.