Make a portable variable power supply

Having a variable power supply is essential for most electronics projects. But it’s not always convenient to carry along a full sized power supply. So here we learn how to make a small handy and portable supply that can output between 3,3V - 27V, and also acts like a power bank. TP4056 Battery charger: Converter Step Up Boost Module 2-5V to 5V 1200mA&_osacat=0&_from=R40&_trksid=&_nkw=TP4056&_sacat=0 DC-DC variable Step