This LED candle with breath-activated ON/OFF function draws inspiration from the candles traditionally used on birthday cakes. By replicating the gesture of lighting the candles with a lighter and blowing them out after making a wish, this DIY project emulates that experience.
The LED candle kit consists of two distinct parts: an audio amplifier with NPN 9013 and PNP 9012 transistors, and a switch circuit that includes a photodiode a