Controller board for a dental suction vacuum pump system using a 24 V low-voltage control board, VFD motor drive interface, 4–20 mA vacuum sensing, float/temperature safety inputs, solenoid flush output, alarm output, and local display.

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Low-voltage logic-only CERILUME Phase 1 LED controller using an Arduino Nano ESP32 plug-in module, 5V logic level shifting for WS2812/SK6812 data, microphone input header, and labeled test pads. LED power distribution and high-current switching are intentionally out of scope.

Low-voltage ESP32-S3-DevKitC-1 carrier and control board for ATLAS X, with OLED, buttons, DS18B20 input, indicators, expansion, and no fan circuitry in Revision A.

Carrier PCB for a removable 5S 18.5 V 4000 mAh LiPo-powered Raspberry Pi 400 workstation. Provides protected input, independent low-voltage cutoff, dedicated fused 5.1 V USB-C Pi output, 5 V USB-C LCD output, 12 V center-positive KVM output, cooling-fan power, and a safety-interlocked USB-C PD 5S charging path. This project remains under engineering review and is not fabrication-ready.

Manufacturable 96-well FR4 electrode plate with shared working, reference, and counter electrode channels, intended for low-voltage electrolysis in buffer/saline and compatible with a later AAA-powered controller.

Low-voltage DC distribution board for an Australian faceplate: 24V input with fused 24V pass-through and isolated 12V/5A conversion feeding three individually protected 12V outputs in a 75 × 75 mm envelope.

Low-voltage monitoring circuit for a nominal 24V DC input. The TL431 threshold detector and BC547B driver activate a 5V active buzzer when PLUS drops below about 19.5V.

Safe low-voltage educational residual-current device demonstrator for wet-area protection concepts

Low-voltage control and power-control electronics for a 10-channel 220 V AC power sequencer using ESP32, shift registers, OLED display, and isolated/high-current AC sections to be added later.

Low-voltage logic-only CERILUME Phase 1 LED controller using an Arduino Nano ESP32 plug-in module, 5V logic level shifting for WS2812/SK6812 data, microphone input header, and labeled test pads. LED power distribution and high-current switching are intentionally out of scope.

Premium dual-PCB ESP32 smart water level controller with isolated high-voltage power/motor board, low-voltage IoT logic board, level sensing, dry-run/voltage/current protection, TFT UI, MQTT connectivity, RTC logging, and industrial surge protection.

Manufacturable Rev A proof-of-concept PCB system for the SOLX modular magnetic lamp platform, documenting a standardized magnetic pogo-pin electrical pass-through interface, 12V low-voltage power transfer, reserved data/ID contacts, module identification support, automatic configuration recognition, lifecycle metadata tracking capability, and patent-supporting manufacturing/test documentation.

Per-channel low-voltage controller PCB for RIL TC/HF/LeTID and PID test benches. STM32H7, 16-bit DAC setpoints, 24-bit ADC sense (4-wire), isolated digital interface to gate driver, PT100/RH conditioning, Ethernet, interlocks. Safety-critical brain board.

Partitioned Tesla coil system with separate high-voltage power stage and low-voltage control board, designed around a fixed secondary coil and reuse of an external bridge rectifier and 5500 uF 450 VDC bulk capacitor where applicable.

Industrial ESP32-based mains-powered controller with 220 VAC input, isolated 5 V supply, 8 SSR-controlled high-current AC output channels, and a single RTD temperature input. Layout and safety constraints must preserve reinforced isolation and separation between hazardous mains/high-current paths and low-voltage control circuitry.

Multi-device wireless control system using a Seeed Studio XIAO ESP32-C3, 433 MHz ASK receiver, 5 V relay drivers, AMS1117-3.3 regulator, input protection, and PCB isolation between low-voltage control and relay output sections.

Low-voltage energy meter front-end (ESP32 + ACS712 + 9VAC sense)

The EMF30N02J from Excelliance MOS Corporation is an N-Channel Logic Level Enhancement Mode Field Effect Transistor designed for high efficiency and performance in a compact SOT-23 package. With a maximum Drain-Source voltage (BVDSS) of 20V and a maximum Drain current (ID) of 5A at 25°C, this MOSFET is ideal for low-voltage switching applications. It features a low maximum Drain-Source On-State Resistance (RDSON) of 30mΩ at a Gate-Source voltage (VGS) of 4.5V, ensuring minimal power dissipation. The component supports a Gate-Source voltage (VGS) up to +12V and operates within a temperature range of -55°C to 150°C. The EMF30N02J is also Pb-Free, Halogen-Free, and classified as a GP Green Product, making it environmentally friendly. Key electrical characteristics include a Gate Threshold Voltage (VGS(th)) between 0.45V and 1.2V, a maximum Gate-Body Leakage (IGSS) of 100nA, and a typical Forward Transconductance (gfs) of 7S. Additionally, the MOSFET exhibits excellent dynamic performance with a total Gate Charge (Qg) of 6.2nC, making it suitable for high-speed switching applications. The thermal resistance is rated at 100°C/W from junction-to-ambient and 55°C/W from junction-to-lead, ensuring efficient thermal management.

The TCA9555 by Texas Instruments is a low-voltage, 16-bit I2C and SMBus I/O expander designed to provide general-purpose remote I/O expansion for most microcontroller families via the I2C interface. Operating at a voltage range of 1.65V to 5.5V, this component integrates two 8-bit Configuration, Input Port, Output Port, and Polarity Inversion registers, making it an ideal solution for applications requiring additional I/Os such as servers, personal computers, routers, industrial automation equipment, and products with GPIO-limited processors. The TCA9555 features a low standby-current consumption of 3.5uA maximum, compatibility with 5V I/O ports, a 400kHz Fast I2C Bus, and includes an open-drain active-low interrupt output which enhances its utility in complex systems. Noteworthy for its high-current drive capability suitable for directly driving LEDs, the TCA9555 also brings a configurable slave address with 3 address pins, providing the flexibility needed in varied application requirements. Offering robust protection with latch-up performance exceeding 100mA per JESD 78, Class II, and ESD protection exceeding JESD 22, the TCA9555 combines reliability with expansive functionality for sophisticated electronic designs.

A Low-Voltage Audio Power Amplifier is a device designed to amplify audio signals while operating at low supply voltages, typically between 1.8V to 5V. These amplifiers are commonly used in battery-powered devices like portable speakers, headphones, and other mobile audio applications where power efficiency and compact size are crucial.

The Texas Instruments TCA9555 is a low-voltage 16-bit I2C and SMBus I/O expander tailored for operation in the 1.65-V to 5.5-V range, making it an ideal candidate for enhancing the I/O capabilities of general-purpose microcontrollers with limited GPIOs. Given part numbers corresponding to different package types, such as TCA9555DBR, TCA9555DBT for SSOP packages, TCA9555PWR for TSSOP packages, and TCA9555RGER, TCA9555RTWR for VQFN and WQFN packages respectively, the TCA9555 provides versatility in integration across various design layouts. This component features an open-drain active-low interrupt output, configurable slave addresses utilizing 3 address pins, and polarity inversion registers. Notably, this I/O expander exceeds the 100 mA per JESD 78, Class II latch-up performance and offers significant ESD protection. These characteristics, combined with the capability to directly drive LEDs with its latched outputs, make the TCA9555 a practical solution for applications requiring additional I/Os such as in servers, personal electronics, and industrial automation equipment, among others.

The TCA9555, manufactured by Texas Instruments, is a low-voltage 16-bit I/O expander designed for both I2C and SMBus for operation with a supply voltage ranging from 1.65 V to 5.5 V. This component is aimed at providing general-purpose remote I/O expansion for most microcontroller families through the I2C interface. The TCA9555 is characterized by its low standby-current consumption of maximum 3.5 uA and includes notable features such as open-drain active-low interrupt output, 5-V tolerant I/O ports, and configurable slave addresses through 3 address pins. It is designed to assist in applications such as servers, routers, personal computers, personal electronics, and industrial automation equipment, among others. Its multiple package options, including TSSOP, SSOP, WQFN, and VQFN, accommodate different sizes and form factors suitable for diverse implementation requirements. The device distinguishes itself with a polarity inversion register and latched outputs capable of directly driving LEDs, showcasing versatility in usage. Its protection features exceed JESD 22 standards for ESD, ensuring robustness for industrial applications. The TCA9555's compatibility with various microcontrollers and support for up to 400-kHz I2C bus speed make it an efficient solution for expanding I/O capabilities in space-constrained applications.