In EasyEDA open source hardware lab, open source square pools all kinds of electrical design engineerings together to realize resource sharing easily.
Kapella copy - EasyEDA open source hardware lab
DIY LiPo Charge/Protect/5V Boost Circuit
2x LiPO Battery to 12V and 5V Converter
Zero Multi-Power Supply is Battery supported
Rebuilding Classic Drive-in-theater Speakers With the Help of Fusion 360 : 17 Steps (with Pictures) - Instructables
Antweights
Micromachines, Free Full-Text
7.4V Lithium Battery Charger Circuit copy - EasyEDA open source hardware lab
Antweights