I made a small DC-DC power supply for prototyping, projects, assembly and electronic experiments.

A simple but very useful Zener diode tester

It's a voltmeter that indicates battery status, more precisely the value of the voltage battery.

Buying a ready-made power supply would be too easy, so I decided to make my own.

A familiar circuit, but still useful.

This universal power supply board is a perfect match for powering the low power devices such as MCUs, Sensors & Modules with the best load and line regulation features. The board can take an AC or DC input of as low as 8V and as high as 28V to provide a multiple DC output voltages like 3.3V, 5V, 12V, variable DC output, and the output same as the input. The maximum load regulation is measured to be 60mV and the maximum line regulation is measured to be 0.2%/V.

This project demonstrates how to build a simple Voltage Regulator using the 7805 integrated circuit (IC). The 7805 provides a stable 5V output from a higher input voltage, making it ideal for powering circuits and components that require a 5V power supply.

Battery charger with BD-type transistor

Modular power strip with 5 outlets, 10A capacity, and a 3 m cord, made of durable black ABS for desk, wall, or floor installation.

Build this super simple, portable, USB-C powered 0-30vdc power supply!

Double voltage source +15V / -15V and +5V / -5V stabilized

Differential voltage source at home.

This circuit is made for a DIY builder, I left enough room for a heat sink. for the filter capacitor.

BenchVolt PD is an open-source, USB Power Delivery-based bench power supply capable of delivering up to 100 W through multiple DC-DC converters and LDO channels. It provides adjustable and programmable outputs(waveform capable), current monitoring, and real-time voltage/current display — all powered directly from a USB-C PD adapter.

Power your outdoor electronics with this compact and smart 18650 solar charging PCB! Designed for low-power IoT projects like ESP-based sensors or automation nodes, this board combines a TP4056 charging module (with integrated undervoltage protection), a TPS61023 5 V boost converter, and two optional switches for flexible power management. The board runs from up to five 5V solar panels and supports one or two 18650 Li-Ion cells. Ideal for garden sensors, smart weather stations, and other mobile DIY projects. For full assembly instructions and detailed specs, visit: https://smarthomeyourself.de/18650-solar-platine This is a non-commercial community-driven design. Feel free to build and share it! ????️ Components & links below

Tester circuit for LEDs