DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
If you’re a radio electronics enthusiast or hobbyist, building a Simple FM transmitter using readily available components like BC547 transistors can be both fun and educational. This compact circuit transmits voice signals captured via an electret microphone to a standard FM radio receiver, making it perfect for short-range audio transmission projects. Simple FM Transmitter – […]
Do you love electronics and want a fun, beginner-friendly project? Build a two transistor radio! This classic DIY project, featuring simple components, gained popularity years ago and still teaches radio technology effectively. Let’s explore how you can create your own two transistor radio easily. What is a Reflex Circuit? A reflex circuit cleverly reuses one […]
Harnessing solar power to charge lithium-ion batteries is not only energy-efficient but also an eco-conscious choice for portable electronics. In this article, we explore a compact and reliable lithium-ion solar charger circuit that uses a few standard ICs: LM2941, LM3420-8.4, and LMC662. Designed for charging a 2-cell Li-ion battery pack, this setup is ideal for […]
If you’re working with RF circuits and need to improve signal reception or create a compact antenna solution, the Signal Grabber circuit is an excellent project to tackle. This clever design creates a short pull-up antenna that delivers impressive performance in a small package. The Signal Grabber is a specialized RF circuit designed to create […]
Tired of static on your AM or shortwave radio? Do you struggle to hear distant stations? There is a simple fix. You can build a special antenna that makes radio signals much stronger. This guide shows you how to build a DIY active antenna. It is a fun project that can give you crystal-clear reception. […]
When you need accurate, stable frequency generation for digital circuits, few solutions are as elegant and cost-effective as a crystal-controlled CMOS oscillator. This classic circuit design demonstrates how a simple TV color crystal can be transformed into a versatile frequency source for various applications. At the heart of this circuit lies an inexpensive 3.58 MHz […]
The NJM4558 audio compressor represents one of the most reliable and widely-used integrated circuits in professional audio applications. Furthermore, this dual operational amplifier IC has become the cornerstone of countless audio compression circuits due to its exceptional performance characteristics and versatility. The NJM4558 audio compressor circuit shown in the schematic demonstrates a sophisticated approach to […]
Solar cells can easily provide enough power to operate a small radio receiver. This DIY Solar Powered Radio project is an ideal set to take away on holiday. It covers the medium wave (AM) waveband, so why not laze on the beach this summer and listen to your favourite station. But first, let’s get busy with […]
A Beginner’s Guide to ATS20+ Firmware flashing Hey radio enthusiasts! Ever wondered if your beloved ATS20+ receiver could do more, or perhaps perform even better? The answer is often a resounding YES, thanks to community-developed firmwares that unlock new features, improve performance, and even change the user interface. Flashing new firmware might sound daunting, like […]
From a fellow ham radio enthusiast, I recently acquired a refurbished Dell OptiPlex 980. My plan is to turn this vintage desktop into a dedicated machine for amateur digital operations like FT8, a task that doesn’t demand cutting-edge hardware but certainly benefits from stable performance. The system arrived with Windows 7 Pro 64-bit pre-installed, which […]