Discover the science behind Sporadic E propagation — the ionospheric phenomenon that lets FM radio signals travel 2,000+ km. Includes antenna tips, best seasons, monitoring tools, and DX listening tricks
Tag: FM
A collection of DIY FM radio projects and circuits, mainly low-power FM transmitters and related RF builds for the 88–108 MHz broadcast band, including simple transistor transmitters, crystal-controlled designs, and miniature FM bug transmitters.
Build a Powerful FM Radio Bug Transmitter
Three-stage FM bug transmitter using BC547 audio preamp, RF oscillator/modulator, and 2N3563 power amplifier for strong 100 MHz transmission. High-performance DIY wireless microphone circuit with improved range and signal stability.
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
Build a Miniature FM Transmitter – DIY Electronics Project
Learn how to build a compact, high-sensitivity Miniature FM Transmitter with this DIY electronics guide. Featuring a simple transistor-based schematic and an electret microphone, this project is perfect for beginners exploring RF circuits and wireless audio.
DIY 3-Transistor FM Bug Transmitter Using Piezo Mic
Build a high-sensitivity DIY 3-Transistor FM Bug Transmitter using a piezo microphone. This step-by-step guide includes a stable schematic, BC547 transistor tips, and frequency tuning advice for crystal-clear long-range audio monitoring.
Simple FM Transmitter Using BC547 Transistors
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 – […]
Build Your Own 90MHz Crystal Controlled FM Transmitter
A crystal controlled FM transmitter is a radio frequency (RF) circuit that uses a quartz crystal oscillator to generate a stable, precise frequency for FM radio transmission. Unlike simple LC oscillator circuits, crystal-controlled transmitters offer superior frequency stability and accuracy, making them ideal for applications requiring consistent performance. The heart of this transmitter is a […]
Build a Simple FM Band Transmitter Circuit
Are you interested in radio electronics? This simple FM band transmitter circuit offers an excellent starting point for beginners and hobbyists. You can build this transmitter using common electronic components and start broadcasting on the FM band.This Simple FM band transmitter uses a single transistor (Q1 – 2222A) as the main oscillator. The circuit operates […]
Mini FM Radio Transmitter
Have you ever wanted to broadcast your voice, even just a little bit? Well, now you can! This circuit diagram shows you how to build a simple FM Radio Transmitter . It’s a fun project, and it uses only a few basic parts.
Circuit – FM Bandstop Filter for RTL SDR
FM Bandstop Filter for RTL SDR The given FM band stop filter is nothing more than a simple Band stop filter for the frequency range of 88-108Mhz. FM Broadcast transmitters transmit at high power and can cause overloading and intermodulation problems on simple receivers like RTL-SDR due to its wide open front end. The said […]