DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
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 […]
Ready for a better user interface and new features? Follow our simple guide to updating your ATS Mini DSP receiver firmware using easy web-based tools or desktop software
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 […]
Ham Radio Repeater Toneburst Module generates a precise 1750Hz toneburst lasting 0.5 seconds, essential for accessing UK and European amateur radio repeaters.
This audible continuity tester uses a simple oscillator IC to generate a tone when a closed circuit is detected. Powered by a 1.5V battery, it provides instant audio feedback for testing wires, fuses, PCB traces, and connections, making troubleshooting faster and hands-free.
This simple sine wave oscillator uses a transistor-based phase-shift network to generate a clean periodic signal, then amplifies it with an LM386 for usable output. It runs on a 9V supply and suits audio testing, tone generation, and learning oscillator fundamentals
This TL071 audio compressor circuit uses a single-supply design with a TL071 op-amp as a voltage-controlled amplifier to manage audio levels. It includes input coupling, peak detection, and RC timing networks to control compression, delivering stable, low-noise dynamic range control for audio and radio applications.
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 […]
ATS-20 is a compact SI4732-based multiband DSP receiver covering FM, MW, SW, and SSB — a highly sensitive portable radio with external antenna support and mod-friendly firmware