Review-stage programmable single-phase AC EV charging controller and test board schematic. Not production-ready or safety-certified; HV, relay, creepage/clearance, thermal, EMC, protection, and manufacturing decisions require review.

High-performance ESP32-based smart CDI / motorcycle ECU with automotive 12V transient protection, flyback HV capacitor charging, isolated SCR firing, VR pickup input, analog sensors, and auxiliary low-side outputs.

Mini UPS PCB for a 42 V external adapter and external 10S lithium battery pack. Includes adapter-priority source selection with automatic switchover, input protection, ideal-diode OR-ing, a 30 V to 42 V HV bus, and a regulated 12 V output stage. Includes status LEDs and battery monitor pads. Excludes onboard charger circuitry and excludes adapter or battery source design.

110 VAC mains-input PDLC controller redesign for 25 W+ load with protected front end, rectified HV bus, auxiliary control supply, and preserved downstream square-wave output control.

HVAC System controller board. Features 4 10A250VAC relays (For power control), a BME680 for environmental monitoring and a 5v-35v driver to control up to 2 DC motors. #esp32 #iot

Template for Arduino Uno R3 Shield. Include an official pinout so you will always know Arduino names, the alternative roles of pins, which one is SDA, or SCL, etc. On PCB you can find the 3D model of the Arduino Uno R3 itself along with the board outline on the silkscreen. #Arduino #Uno #Shield #Template #project-template #project

Power-section schematic for a 12V DC input generating +4V for a 4G module, +5V, and +3V3 rails with input TVS protection and regulator thermal notes.

220 VAC şebekeden beslenen, yaklaşık 310 VDC bus üzerinde çalışan, sensörsüz zıt-EMK algılamalı 6-adım BLDC/PMSM kurutma makinesi motor sürücü kartı.

220 VAC şebekeden beslenen, yaklaşık 310 VDC bus üzerinde çalışan, sensörsüz zıt-EMK algılamalı 6-adım BLDC/PMSM kurutma makinesi motor sürücü kartı.

High-fidelity high-voltage amplifier for 2.5 nF ultrasonic piezo transducer, 10 V input, gain 40, up to 400 V peak single-ended output from 220 VAC with 3 A peak overcurrent protection and China-preferred component sourcing.

±1000 V 高压任意波形放大器，1.5 nF 负载，6 A 过流，三接口外部交互，国产器件优先。

220VAC-powered high-voltage arbitrary waveform amplifier targeting ±1000Vpeak into 2.5nF, 0–500kHz, ≥10A peak with ≤4000V/µs slew-rate limit; component selection prioritizes China-made / China-supply-chain parts where safe and technically suitable.

用于超声波瞬时信号的高保真高压电压放大器，目标输入最大 10V、增益 100、输出最大 1000V，220VAC 供电，过流阈值 3A，优先采用中国生产电子元件。

Supervised-bench reference schematic for a 100 W, 230 VAC single-phase transformerless bidirectional grid-to-12 V battery converter, including protection, sensing, isolated control interfaces, LCL/EMI filtering, HV bridge, DC link, and non-isolated synchronous buck/boost stage. Not a certified grid-tie product.

Production-prototype ESP32-S3 control/RF/GNSS/sensor board for an outdoor livestock collar. Includes LoRa 915 MHz, GNSS, I2C/I2S sensors, local actuator drivers, battery-cell solder pads, solar pass-through, soldered flex-tail zones, HV electrode isolation, test points, and a 120 mm x 80 mm 4-layer FR4 target stackup.

Compact USB dongle PCB for Midea air conditioners based on the mideahvac-dongle architecture, using an ESP32-C6 module, 5V UART level shifting, WS2812B status LED, USB-A appliance connector, and USB-C programming/power.

Template for Arduino Uno R3 Shield. Include an official pinout so you will always know Arduino names, the alternative roles of pins, which one is SDA, or SCL, etc. On PCB you can find the 3D model of the Arduino Uno R3 itself along with the board outline on the silkscreen. #Arduino #Uno #Shield #Template #project-template #project

HVAC System controller board. Features 4 10A250VAC relays (For power control), a BME680 for environmental monitoring and a 5v-35v driver to control up to 2 DC motors. #esp32 #iot

HVAC System controller board. Features 4 10A250VAC relays (For power control), a BME680 for environmental monitoring and a 5v-35v driver to control up to 2 DC motors. #esp32 #iot

The LTC3109 from Linear Technology is a highly integrated DC/DC converter specifically designed for energy harvesting applications. It can operate from ultra-low input voltages as low as 30mV, utilizing a unique, proprietary auto-polarity architecture to function regardless of input polarity. The component is ideal for harvesting energy from thermoelectric generators (TEGs) and thermopiles, efficiently converting this energy to power remote sensors, wireless transmitters, and low-power devices. Key features include selectable output voltages of 2.35V, 3.3V, 4.1V, or 5V, a 2.2V low-dropout (LDO) regulator, a logic-controlled output, and an energy storage system to maintain operation during power interruptions. The LTC3109 is encapsulated in a small, 20-lead (4mm × 4mm) QFN or SSOP package, making it compact and suitable for space-constrained applications in HVAC systems, building automation, and industrial wireless sensing. Additionally, the power good indicator and the ability to use compact step-up transformers further enhance its suitability for low power, energy-harvesting systems.

Compressor PCB - ESP32-S3 HVAC field sensing (24 VAC + CT + UART)