DIY Active Antenna for superior HF and VHF reception! This DIY electronics project amplifies weak signals to lift hard-to-hear broadcasts out of the noise
DIY
“DIY” on DXR Electronics Bits is where practical ham radio projects come to life. Here you’ll find buildable circuits, antennas, receivers, preamps, audio tools, and experimental rigs designed for real‑world shack and field use. From compact HF antennas for small spaces to regenerative receivers, QRP transmitters, and uBITX add‑ons, each article focuses on parts you can actually source and solder on the bench.
Build a DIY Ion Detector: Detect Airborne Ions and Electrostatic Emissions
Build a simple handheld DIY Ion detector circuit using transistors to detect air ions, static discharge, and emissions. Perfect for science electronics projects
Simple Incandescent Lamp Flasher Circuit Using 7555 Timer
Build a simple incandescent lamp flasher using a 7555 timer and MOSFETs. Ideal for DIY projects with adjustable flash rate and low parts count.
Tiny FM Transmitter with Just a Few Easy-to-Find Components
Learn how to build a compact Tiny FM transmitter using 2N3904, a few passive parts, and a simple air-core coil. Perfect for DIY electronics enthusiasts
27MHz AM Transmitter Circuit for hobbyists
The 27MHz frequency band has long been a favorite among electronics enthusiasts and amateur radio operators. This citizen’s band frequency offers excellent propagation characteristics and serves as an ideal starting point for understanding amplitude modulation (AM) transmission principles. Today, we’ll explore a well-designed 27MHz AM transmitter circuit that demonstrates classic RF engineering concepts while remaining accessible to hobbyists
AM Radio into an SSB Receiver with a Simple BFO Circuit
Learn how to convert a standard AM radio into an SSB receiver using a simple BFO circuit. Step-by-step guide to receiving single sideband signals on your homebrew or vintage radio.
Automatic Battery Saver Circuit: Prevent Battery Drain
Dead batteries are every electronics enthusiast’s nightmare. Whether it’s a forgotten device left running overnight or equipment accidentally switched on, battery drain can be costly and frustrating. This automatic battery saver circuit offers an elegant solution using the versatile 4060 oscillator and counter IC, providing reliable protection for your battery-powered projects. How the Battery Saver […]
Build a Simple Speech Processor Circuit Using LM358
A speech processor is an essential component in amateur radio and audio systems that enhances voice clarity and intelligibility. This comprehensive guide will walk you through building a simple yet effective simple speech processor circuit using the LM358 operational amplifier and discrete components. A speech processor is an electronic device that modifies audio signals to […]
Simple UJT Crystal Checker Circuit: Test Your Crystals Like a Pro
Stop guessing if your quartz crystals are dead or alive! Learn how to build a Simple UJT Crystal Checker circuit to test your components like a pro. This DIY guide includes a full schematic, 2N2646 UJT tips, and step-by-step instructions for quick troubleshooting.
Build Your Own Hidden Transmitter Hunter RF Sniffer Circuit
Ready to go on a “Fox Hunt”? Whether you are tracking down a hidden transmitter for a local Ham radio competition or trying to find a mysterious source of RFI in your shack, you need a tool that is more sensitive than a standard field strength meter.