Mini ST-LINK/V2, in-circuit debugger/programmer for STM8 and STM32
The S9V11MA switching step-up/step-down regulator efficiently produces a...
Comes with a 6"x6" (152mm x 152mm) square of Pyralux. It's ED-Y type copper at 35um (1 oz/ft2) and has a polymide of 25um (1 mil). The thick copper layer means it can carry a lot of current, and its trivial to solder to it. Adafruit 1894