Who would’ve thought a cheap AliExpress emergency light ... a smart circuit that defies its humble price. The circuit operates via a capacitive dropper, a cost-effective way to power low-current ...

On the other hand, battery packs contain potentially volatile materials that require circuits to be designed with safety ...

Using a PIC16F628A, he constructs a test circuit which allows him to demonstrate the power savings gained by using sleep mode rather than the microcontroller’s built-in delay function.