Change History from V1:
-Font Bigger for SMD Footprint and IC designators
-Confirmed that V1 worked for LED energy harvesting and NFC write/read
Forked an amazing PCB business card from Mark Wu and added a SMD footprint and silkscreen art.
Compact ≤60×60 mm rechargeable warm-white LED PCB for a Minecraft-style lantern replica, designed for a 3D-printed cubic housing with beginner-friendly assembly.
Premium wearable smartwatch PCB with nRF5340 BLE MCU, USB-C Li-Po charging, health sensors, haptics, and behavioral-feedback stimulation circuitry in a 40 mm four-layer form factor.
Control PCB for a robotic platform with 24V input, STM32F427ZI coordination, Ethernet/USB/CAN/RS-485/wireless interfaces, load gating, thermal control, and STO safety monitoring.
Custom base PCB for a Blue AI figurine with ESP32-S3 Wi‑Fi/BLE, I2S microphone and speaker audio, LiPo battery charging, eye LEDs, and expansion wiring into the figure.
Modular horizontal strip PCB for a wall calendar matrix: 3 month rows by 31 day columns, with 93 WS2812B/SK6812-style RGB LED cells, 93 SMD tactile switches, anti-ghosting diodes, and dual I2C GPIO expanders for button matrix scanning.
Transformer-isolated rectifier, 7812 regulated 12 V supply, and 2N2222 single-transistor audio amplifier PCB recreated from the reference circuit image.
12 V 2N2222 common-emitter audio amplifier PCB based on the uploaded reference diagram, with AC input coupling, adjustable base bias, emitter bypass, collector load, output coupling capacitor, and speaker connector.
