AMS1117 LDO + Brown-Out Supervisor

A clean 3.3 V rail for an MCU, plus a reset line that holds the chip in reset until the rail is healthy.

Difficulty: Surface-mount. Estimated build time: about 60 minutes. Estimated parts cost: about US$5.00. 9-part bill of materials with live supplier pricing. Two SMD building blocks every MCU board needs, on one tiny board: an AMS1117-3.3 LDO turning a 5 V input into a stable 3.3 V rail, and an external reset supervisor that holds the MCU's RESET line low until the 3.3 V is above its safe…