Use this template if you plan to get your 1-4 layer boards manufactured with HQ NextPCB (nextpcb.com). This template is designed for generic designs to minimize unnecessary costs and complications where possible. https://www.nextpcb.com/pcb-capabilities #project-template #template #manufacturer-design-rules

Use this template if you plan to get your 1-4 layer boards manufactured with HQ NextPCB (nextpcb.com). This template is designed for generic designs to minimize unnecessary costs and complications where possible. https://www.nextpcb.com/pcb-capabilities #project-template #template #manufacturer-design-rules

Use this template if you plan to get your 1-4 layer boards manufactured with HQ NextPCB (nextpcb.com). This template is designed for generic designs to minimize unnecessary costs and complications where possible. https://www.nextpcb.com/pcb-capabilities #project-template #template #manufacturer-design-rules

Use this template if you plan to get your 1-4 layer boards manufactured with HQ NextPCB (nextpcb.com). This template is designed for generic designs to minimize unnecessary costs and complications where possible. https://www.nextpcb.com/pcb-capabilities #project-template #template #manufacturer-design-rules

Use this template if you plan to get your 1-4 layer boards manufactured with HQ NextPCB (nextpcb.com). This template is designed for generic designs to minimize unnecessary costs and complications where possible. https://www.nextpcb.com/pcb-capabilities #project-template #template #manufacturer-design-rules

https://www.olimex.com/

Single-subsystem 3.3 V synchronous buck-boost regulator reference built around the TI TPS63802DLAR in a 10-pin VSON package. The design accepts a VBUS input rail into VIN, uses a Bourns SRP4020TA-4R7M 4.7 µH power inductor between L1/L2, and generates PP3V3 from the adjustable TPS63802 output path. The TPS63802 metadata lists a 1.3 V to 5.5 V input range, 2 A output current, selectable switching-frequency modes around 1.4 MHz to 2.1 MHz, and -40 °C to +125 °C junction operation. Support circuitry includes 22 µF and 1 µF ceramic input/output capacitors, a 511 kΩ / 91 kΩ feedback divider for the PP3V3_FB node, a VBUS-derived enable divider using 93.1 kΩ and 100 kΩ resistors, MODE tied to GND, and a 100 kΩ pull-up from PP3V3 to the power-good output. Intended as a reusable compact 3.3 V buck-boost power-supply module for USB, battery, portable, IoT, or embedded sensor designs.

ESP32-S3 N16R8 based IoT board using a WiFi/BLE MCU module as the main controller.

Compact ESP32-C3-MINI single-cell Li-ion/LiPo board with MCP73831 4.2 V charger, MIC5219 3.3 V LDO, boot/reset support, charge status LED, and required test points.

Compact USB-powered desktop CO₂ air quality monitor using an ESP32-S3 module, Sensirion NDIR CO₂ sensing, I²C OLED display, and RGB air-quality indication.

USB 2.0-only 14P Type-C Receptacle connector

Inductor inductor choke coil reactor magnetic Choke_* *Coil* Inductor_* L_*

Receptacle Assembly, 9 Position, Right Angle *MY_DB9F_RA*

Resistor R res resistor R_*

USB-C powered ESP32 WiFi water-flow-meter controller for an external 12V RS485 ultrasonic sensor on 3/4 inch PVC pipe, with protected power input, 3.3V logic rail, 12V boost rail, programming header, reset/boot controls, and status LEDs.

Through-hole 9V battery-powered 555 timer circuit that blinks a red LED about once per second through an on/off switch.

Consumer USB-C 5 V powered low-power temperature and humidity sensor node with ESP32-class Wi-Fi/BLE 5.x connectivity, USB-C sink input, protected 5 V power path, and 3.3 V digital sensor subsystem.

BLE smart espresso scale with USB-C power, single-cell Li-ion battery charging, load-cell measurement, local data logging, and an integrated segment/display interface.

USB-C powered smart espresso scale with ESP32 phone connectivity, load-cell measurement, local data storage, and an integrated display for live weight/timer readout.

USB-C 2.0 power entry with ESD protection and automatic USB/battery ORing onto a shared 5 V system rail.

Texas Instruments BQ25606RGER single-cell Li-ion/Li-polymer charger and NVDC power-path reference with USB source detection, programmable charge/input current, NTC monitoring, and status indicators.

Single-cell Li-ion/Li-polymer charger and NVDC power-path reference design based on the TI BQ25606RGER, with input and charge-current programming, battery temperature sensing, and status indication.

BoomPack Dual ESP32 Audio Pod — synchronized multi-room audio pod using dual ESP32-WROOM-32U modules, USB-C Li-ion charging, 5V boost power, and MAX98357A I2S speaker output.

Multi-subsystem ESP32-S3 coffee maker/alarm controller board for a Coffee Waker appliance. The design uses an ESP32-S3-WROOM-1-N8R8 module as the main Wi-Fi/Bluetooth MCU, with USB-C 2.0 device connectivity through a USB4105-GF-A connector, 5.1 kΩ CC pull-downs, and USBLC6-2SC6 ESD protection on the USB D+/D− pair. Power architecture includes a 12 V input on a JST VH B4P connector, a TPS62932 buck regulator generating the 5 V rail, a TLV1117LV33 3.3 V LDO for MCU/logic power, and TPS22919 load switches for controlled 3.3 V/5 V peripheral rails. Functional blocks include an NAU7802 load-cell ADC on I2C with two differential load-cell channels, a MAX98357A I2S audio amplifier/DAC with speaker/output filtering, a microSD socket on SDIO, I2C/test headers, UART/programming header, and auxiliary JST VH connectors for wake-light or external loads. The high-voltage section includes 120 VAC input/output screw terminals, a 5 V SPST-NO relay rated 15 A / 240 VAC max, a 1 A fuse, MOV surge suppression, diode snubber, and a dedicated heater output terminal.