Battery full Charge Alarm
🔋 Build Smarter. Charge Smarter.

Most people plug in a lithium battery and hope for the best.
Engineers do not hope.
They design.
This simple circuit transforms a basic TP4056 charger into a smart full charge alert system.
Here is the beauty of it:
When the battery reaches full charge, the TP4056 changes state.
That signal drives the BC557 transistor.
The transistor switches the buzzer.
You get an instant audio alert.
No coding.
No microcontroller.
Just pure electronic logic doing what it was designed to do.
This is what I love about electronics.
Small components.
Clear logic.
Real world impact.
If you work with 18650 cells, power banks, or DIY battery packs, this tiny upgrade adds intelligence to your build.
Smart design is not about complexity.
It is about control.
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