How to make a Variable power supply using an old phone charger | JLCPCB

JLCPCB 1-20 layer PCB from $2, Sign up to Get $54 Coupons here: jlcpcb.com/?from=PCBs Available for PTFE Teflon, Rogers, Copper Core, Aluminum and FR-4 PCB Assembly and 3D Printing at a Rock-bottom Price too.