4-layer 9–15 V input SEPIC converter producing regulated 12 V at up to 1.5 A, using IRLZ44N MOSFET, SS34 Schottky diode, separate 100 µH inductors, and thermal-via PCB layout for EV battery-management student project.

Industrial dual motor controller using an ESP8266 NodeMCU and L298N dual H-bridge for 2x 12V 2A DC motors, with MQTT remote control, manual override buttons, 5-bit DIP addressing, reset input, status LEDs, SS34 reverse-polarity protection, 5A fuse, LM2596 5V buck conversion, TVS surge protection, and future expansion provisions for INA219 current sensing, OTA firmware, RS485, and enclosure integration.