Electronics Development

Simple and reliable method of board-to-board (B2B) connection using right-angle terminals and screws.

Just photos of old power bank design using 100x100 2L boards and many LEDs.

Quick review of modern nanocrystalline cores that now available for any engineer.

Testing of Chinese power bank IC designed for using with 1S battery and with supporting many fast charging protocols. But everything is not so perfect, let's take a closer look.

Analyzing of total PCB price with components and assembly

Listing of custom power bank specification and other requirements.

Searching for existing open source (DIY) power banks.

Searching for existing commercial transparent (DIY) power banks,

Summary

• 💻 MCU: Cortex-M4 STM32F401
• 🖥 Display: IPS 160×80 px (ST7735)
• ⚡Output voltage (MAX): 150V+
• 🎆 Output current (MAX): 150mA+
• 🔽 Control: Mechanical Buttons
• 🔋 Powering: 1S1P 3.7V 18650 Li-Ion Battery
• 🔊 Notification:  Sound (Buzzer)
• ➡ Charging: USB Type-C