Awesome DIY Project

[nkronert]

⚠️ Be careful when soldering near superglue, even if it has hardened. The decomposition fumes are toxic.

[jessisanturo]

Harbor Freight has a non-contact voltage sensor for $ 4.99. In case you're not an electronic engineer.

[crlheureux]

They sell these for about the same price as the charger you began with.

[SteveWhiteDallas]

ajaykatal4026 It's a BC547. The circuit is called a Darlington configuration. One transistor amplifies the previous, so the gain gets higher with each transistor. 5 volts is connected to the collector of both transistors. The negative from the power source is connected to the cathode (-) of the LED. The anode (+) of the LED is connected to the emitter of transistor 2. The electromagnetic field produced by the oscillating AC voltage is picked up by the antenna connected to the base of transistor 1. This saturates the transistor and allows current to flow to the emitter. (base to collector ratio = current gain) The emitter is connected to the base of transistor 2 and the process is repeated for more gain (amplification.) When AC voltage is near enough, the transistors "switch on" to power the LED. This is also how an audio amplifier works, except an audio signal replaces the electromagnetic field from the AC voltage.
ALWAYS insulate the antenna in case it comes into contact with the AC voltage.

[jonclark]

If you're curious what's going on in the circuit, it looks like a darlington pair from BJTs and the coil drives the base current when a field is present. You should include a current limiting resistor for the LED and transistors because there is no "built in" resistance. Just a forward voltage for the LED and you're supplying that via the power bank but it will burnout eventually without limiting the amount of current through it.

[havefunbesafe]

I knew the outlet was working when your soldering iron was on.😅

[digitalphoenix]

Ah! It's a voltage tester. That's a really cool idea. I use them often in my work. They are really cheap, but this project would be fun.

[Alkimi]

Cable tracker from amazon : $20
DIY : 10 cents 😂 🤙

[rottenapple]

This device tells you whether or not you have a cord plugged into the wall, obviously.

[Purone]

Edited this so you'll never know why it has 1k likes 😈

[ujyxjbf]

Всем кто не вкурил.
Юсб порт с проводами питания, 2 транзистора, и катушка индуктивности.
Транзистор это включатель, по центральному контакту если идëт ток, то в зависимости от силы тока и напряжения, он через крайние контакты вход и выход пропускает электричество, чем больше по центральному контакту тока тем больше он пропусксет ток, как выключатель с плавным включением и выключением.
Два транзистора спаивают так что один транзистор на центральном контакте имеет катушку индуктивности, она улавливает электромагнитное поле от проводов напряжения, а второй транзистор включает ток из контактов юсб модуля.
Катушка индуктивности получает напряжение оно идëт по центральному контакту и включает проход току ток проходит на средний контакт второго транзистора и включает второй провод и получается что лампочка загорается а уровень тока регулируется транзисторами и лампочка горит сильнее чем ближе поднесëш катушку индуктивности к источнику электромагнитного поля.

[imvau]

Brilliantly crafted but may I suggest using a Red Led for DANGER SIGN 😂

[iamNtTheGoat]

Step one: get a degree in engineering
Step two: get tools
Step three: get parts
Step four: build this
Step five: plug in:
Step six: try not to burn your house down

[jerrybeaugeziii]

Nice!!! Budget ghost hunting equipment! Suitable for a place like Danville Virginia 🤔

[shubhajitsen]

One data cable is much more important thing for me 🙂

[ferrumignis]

Let's not worry about any current limiting resistor for the LED...

[ThePlainswalker]

Please stop showing people how to make expensive and unsafe versions of inexpensive and safe things.

Signed,
Everyone

[jasondevalle]

Haters going to hate. If you don't like the content then go somewhere else. Good job content creator 👍

[JBlooey]

Powerbank: at least $20

Voltage detector: $5 at Harbor Freight

[ahegpbtrftcotu]

and here i thought this was going to be a usbkiller tutorial. diy current detector is actually a pretty wholesome outcome, and definitely useful!