RENTECH Universal MOSFET Key REV-A

One PCB. Two MOSFETs. Multiple Power-Control Configurations.

Category: Power | PCBWay 9th Project Design Contest

Every electronics project needs power control. But not every project needs a completely new switching circuit.

The RENTECH Universal MOSFET Key was designed around a simple engineering question: Why keep rebuilding essentially the same MOSFET switching circuit for every new embedded device?

Our answer is a compact (30x30mm), configurable PCB that integrates independent N-channel and P-channel switching stages into one reusable hardware platform.

Designed for real applications

The board combines an N-channel low-side switching stage and a P-channel high-side switching stage, with configurable gate resistors, gate-to-source biasing, and solder-selectable interconnections.

Depending on its assembly configuration, the same PCB can support:

• Microcontroller-controlled low-side load switching.
• High-side power switching using an N-MOSFET gate-driving stage.
• Power control for compact battery-operated electronics.
• Controlled supply switching for charging modules and test equipment.
• Optional switched-power status indication.

Flexibility without unnecessary complexity

The design uses common SOT-23 MOSFETs, 1206 passive components, configurable solder jumpers, and separate JST-PH interfaces.

The N-channel and P-channel stages can operate independently or be interconnected through an optional solder bridge.

Instead of designing around a single fixed application, the PCB exposes the power and control connections needed to adapt its operation to different circuits.

Component selection and electrical limits remain application-dependent. The design does not assume that every MOSFET, voltage, current or switching frequency is interchangeable.

Engineering philosophy

This project is about something bigger than saving PCB space.

It is about replacing improvised wiring and repeated one-off solutions with a predictable, documented, repairable building block.

We believe practical electronics should be understandable. Every gate resistor should have a purpose. Every connection should be traceable. Every power path should be measurable.

No imaginary performance figures. No unnecessary complexity. Just deliberate circuit design.

The REV-A design represents our effort to make power switching more reusable, accessible and maintainable across small embedded systems.

Hardware Validation — October 10th, 2026

RENTECH Universal MOSFET Key REV-A is not merely a schematic concept or a PCB render. The board has been physically manufactured, assembled and functionally validated on real hardware.

The project demonstrates a practical approach to reusable power-switching circuitry, combining configurable N-channel and P-channel MOSFET stages on a compact 30 × 30 mm PCB.

RENTECH — Designed with curiosity. Engineered with purpose.

Detailed Project description and some interesting DIY Solutions can be found here:

• https://github.com/vitaliyrenkas-rgb
• https://github.com/vitaliyrenkas-rgb/UNIVERSAL-MOSFET-KEY-PCB