Compact 2-layer ESP32-S3-MINI-1 piezo TX/RX board for a shared 3 MHz transducer node. Includes USB 5 V input, TP4056 single-cell LiPo charging, TLV75533 3.3 V regulation, ferrite-bead isolated 3V3_ANALOG rail, ~12 V pulsed TX boost rail, low-gate-charge NMOS transmit driver, clamp-protected RX input, 2-stage OPA836 analog receive chain, envelope detector, ADC interface, TMP117 I2C temperature sensor, and status LEDs. Layout intent: piezo centered, RX chain within 10 mm of PIEZO_NODE, boost section remote from RX, digital and analog partitioning, and AGND/DGND star connection near RX front end.

Compact 45 mm x 35 mm 4-layer agricultural IoT sensor node using an ATmega4808, AMS1117-3.3 linear regulation from 12 V input, RS-485 Modbus RTU half-duplex, local I2C sensors, 0.96 inch OLED, status LED, and a 12 V solenoid valve driver with top-side sensors/display and bottom-side MCU/power partitioning.

STM32F401 Blackpill-style railway crossing safety controller with dual 12V input selection, LM2596 5V buck, AMS1117-3.3 MCU rail, horn relay driver, and edge-mounted off-board sensor, servo, and UART connectors for modular prototyping.

Multi-layer circular BLDC motor controller for a 24 V, up to 750 W system using an ESP32-WROOM with DRV8323RS gate driver, six external MOSFETs, 2 mOhm shunt current sensing, bottom-mounted AS5600 encoder, USB-C programming/user interface, 3.3 V logic powered from the DRV8323RS buck regulator, and heavy motor phase pads sized for approximately 30 A current paths. Target layout is a circular board around 50 mm diameter, expandable if required for thermal management, power routing, and signal integrity.

Rebuilt two-layer PIC16F628A DTMF relay audio switch with 12 V input, MT8870 decoding, PIC16F628A control, relay driver, and audio switching path.

This tiny board is an easy way to use Toshiba’s TB6612FNG dual motor driver, which can independently control two bidirectional DC motors or one bipolar stepper motor. A recommended motor voltage of 4.5 V to 13.5 V and peak current output of 3 A per channel (1 A continuous) make this a great motor driver for low-power motors. #Module #Motor-Driver #TB6612FNG

Wearable closed-loop ultrasonic monitoring and transcutaneous neuromodulation system based on ESP32-C3, powered from a 7.4 V 1000 mAh LiPo battery with TP4056 charging, MT3608 boost conversion, AMS1117-3.3 regulation, JSN-SR04T ultrasonic sensing, LED and buzzer alerts through a BC547 driver, and a reserved neuromodulation interface for future integration.

SCADA Sensor Node v2.1 using a Heltec WiFi LoRa 32 V4 module with separate +5V and board-generated +3V3 rails, ADS131M08 8-channel ADC front end, TCA9548A I2C multiplexer, TMP102-based fan control, ULN2003A relay and fan driver, CT/pressure/analog/One-Wire/vibration/humidity/Qwiic/flow/digital sensor interfaces, relay outputs, fan connector, brownout sensing, and a 200 mm x 140 mm 2-layer layout with Heltec keepout, antenna clearance, mounting holes, and DIN-rail slots.

Driver drowsiness detection ECG front end based on the AD8232 with ECG electrode interface, analog signal conditioning, a dedicated 50 Hz twin-T notch filter for power-line interference rejection, regulated low-noise analog power, and a downstream conditioned ECG output prepared for processing and fatigue/drowsiness analysis.

300 W universal-input isolated offline SMPS based on a modified ATX-style architecture. Universal 115-230 VAC, 50/60 Hz input via fused IEC C14 inlet. Outputs: +12 V at 20 A, +5 V at 14 A, +3.3 V at 12 A, +5 Vsb at 2.5 A, and -12 V at 0.3 A. Includes primary rectification with GBU806 bridge, bulk capacitors, bleeders, snubbers, main PWM and driver transformer, standby flyback, optocoupler and TL431 feedback, supervisor logic, test points, fan and heatsink provisions, and 2-layer FR-4 PCB layout with 8 mm primary-secondary isolation and heavy copper routing on high-current rails.

5V barrel-powered stepper motor controller board using a TMC2300 driver, a 4-wire JST-PH motor connector, and mechanical motor mounting with two 2 mm holes spaced 20 mm apart plus a centered 8 mm shaft hole.

Single-project implementation of the Blue Ant AMP Architecture Rev2 using one shared schematic with six logical board partitions: PCB-01 phono stage, PCB-02 input selector and relay attenuator interface, PCB-03 balanced driver and RCA-to-balanced conversion interface, PCB-04 dual logical power amplifier channels, PCB-05 multi-rail power supply, and PCB-06 isolated control and display. Explicit inter-partition connector interfaces and named nets preserve balanced signal handling after RCA conversion, distinct rail domains (+63V, -63V, +15V, -15V, +5V, +3.3V), and documented hard constraints including low-noise analog isolation and high-voltage domain separation.

Airsoft HPA FCU - 2S VBAT_SOL direct, nRF52 BLE, MOSFET solenoid driver

6S Li-ion USB-C charged 40V/0.75A PWM-dim LED driver with 433MHz remote

connects driver to motors and provides 3.3V from buck regulator

36 V Contactor Coil Driver with Safe Kill Loop, 3.3 V Logic, SPI IMU, 24 V/5 A Buck, and ESP32 IO12-Driven E-Stop MOSFET via Series PH2.0 Safety Connectors #E_STOP #MOSFET #PH2.0 #SAFETY

Power Tree and Actuator Driver with Robust Filtering, Current Sensing, PGOOD Sequencing, and Star-Tie Grounding

Industrial USB-C PD (12 V) LoRaWAN LED Driver Node

4×4 cm USB-C PD & Qi Wireless Power Bank with Li-Po Charging, Power-Path Management, 3.3 V LDO, Full-Bridge Gate Driver, LED Resistors, and Corrected 5 V Output Feedback (Schematic Cleaned: Redundant Net Portals/Passives Removed, Fuel-Gauge LED Channels Verified, ERC/DRC Issues Resolved)

Compact MPPT Solar-Powered Dusk-to-Dawn 0.5 W LED Light with NCP3065 SEPIC Buck-Boost Driver, BQ24650 MPPT Charger, MIC845 Comparator, Vertical JST-PH 2-Pin Battery Connector, Off-Board Solar Input Pads/Optional Connector, Centered Backside LED, 1.4 mm Perimeter Clearance #SEPIC #NCP3065

ESP32S3 XIAO ePaper HAT+ Driver Board with Integrated Power Rails and SPI Interface

Production-Ready 2-Layer ESP32-S3 Controller PCB: Dual WROOM-1U/WROOM-1 Footprints, ESD-Protected USB-C Debug, Protected 12 V Input (Fuse, Reverse Diode, TVS), TPS5430DDA Buck + TLV70033DDCT LDO Power, Integrated TMC2209 Stepper Driver, 3× 12 V/2 A LED Channels with Screw Terminals, Comprehensive Test Points, Full BOM/Pin Map/Gerbers, Logic Power Supply Audited and Validated #ESP32S3 #PowerManagement #MotorControl #LEDControl #ProductionReady #PowerAudit

Ultra-Stable 850 nm, 1 mW VCSEL Module with Low-Noise Constant-Current Driver and Analog Modulation

Integration of 2.9" Raw E-Paper Display with Raspberry Pi using FPC and Dedicated PMIC Driver

Teensy4.0 Flow Meter Interface with LED Driver and Signal Conditioning