Compact 14-key Kailh Choc wireless macropad with rotary encoder, analog joystick, per-key and perimeter RGBW lighting, dual USB-C, and a 2100 mAh rechargeable battery.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Production-intent compact 5.1 Class-D amplifier with 6 × 50 W outputs, stereo RCA, tape loop, optical PCM, Bluetooth, 3.5 mm AUX, dual passive/powered subwoofer support, and an amber retro-style display.

Compact USB-powered USB-C to 3.3 V UART adapter using a genuine FTDI bridge, USB ESD protection, and a 1x6 UART header.

Compact MAX86141 reflective PPG sensor breakout with 3.3 V host power, SPI, green/red/IR emitter, and external photodiode.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact drone companion autonomy, guidance, communications, and payload-management module with independent safety controller, external mmWave radar support, rugged I/O, and 9–36 V aircraft power input.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact surface-mount production variant of the fixed-function, crystal-referenced low-power burst timer. Electrically equivalent to the through-hole version where practical, with selectable interval, duration, carrier frequency, AUTO/TEST mode, ENABLE output, and gated OSC_OUT; no MCU, firmware, PLL, VCO, or programmable logic.

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.

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.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

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.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.

Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, MCU, small display, and visual status indication, with schematic-first verification.

Compact USB-C powered desktop CO2 monitor using an RP2040, Sensirion SCD30 NDIR sensor, 3.3V I2C OLED header, and RGB air-quality indication, with native USB boot and SWD debug.

Compact USB-C 5 V smart film sample controller that generates a selectable 60–80 VAC bipolar output for up to about 1 ft² of PDLC film, with automatic 1 s clear / 1 s frosted cycling and safety-focused high-voltage design.