DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
The Tools category brings together both hardware and software that make your radio life easier: audio helpers, shack utilities, measurement aids, and digital tools that support building and operating. You’ll find projects like microphone compressors and RF indicators, along with curated lists of PC and web utilities for circuit design, PCB layout, simulation, logging, and on‑air operating
Radio frequency work can be tricky business, especially when you need to measure signal strength without the complexity of tuned circuits. Enter the untuned field strength meter (FSM) a simple effective tool that every electronics enthusiast should have in their toolkit.
The Flipper Zero is a portable multi-tool device designed for cyber security professionals, penetration testers, hardware hackers, and radio enthusiasts. Launched through a successful crowdfunding campaign, this compact device has gained significant attention in the security community for its versatility and educational value in understanding various wireless protocols and digital systems.
The Poor-Man’s Transmitter: Building a Simple AM Radio Beacon from Vintage Electronics, uses a clever arrangement of 4011 CMOS gates to create AM Radio Beacon
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 […]
Ham Radio Repeater Toneburst Module generates a precise 1750Hz toneburst lasting 0.5 seconds, essential for accessing UK and European amateur radio repeaters.
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 […]