TL;DR
A maker named Becky Stern has transformed a disposable vape into a breath-activated synthesizer. Starting with an ElfBars BC5000 vape, she repurposed key components like the lithium polymer (LiPo) battery, USB charging board, and a low-pressure sensor. These parts were integrated with a 555 timer circuit, which generates sound based on the resistance of six photoresistors that detect light changes.