The Mighty Mite 40 Meter QRP CW Transmitter is a legendary low-power Morse code transmitter widely built by amateur radio operators for portable, minimalist, and educational operation.
Tag: transmitter
Explore homebrew RF transmitter on DXR Electronics Bits, including QRP CW transmitters for 40 m/80 m, AM medium-wave and 27 MHz transmitters, FM bug and wireless microphone circuits, and MOSFET Class-E power stages. Learn oscillator stability, modulation techniques, RF filtering, and practical transmitter construction for amateur radio and electronics experimentation.
Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs
Build the Sovina 40 m Class-E CW transmitter using BS170 MOSFETs and 74HC02 logic for efficient 7 MHz QRP operation. High-efficiency switching PA delivers 4–7 W output with clean RF and simple crystal-controlled design for homebrew HF rigs.
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.
DIY 1 MHz AM Transmitter: A Perfect Weekend Project for Beginners
Basics of radio frequency by building a simple 1 MHz AM Transmitter. This guide explains the circuit design and secrets of amplitude modulation for hobbyists
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
How to Build a 3-Watt AM Radio Transmitter
There is something magical about hearing your own voice or music coming through a vintage tube radio from across the room—or across the neighborhood. While many low-power “flea” transmitters struggle with range, this 3-Watt AM monster brings some real “punch” to the Medium Wave band.
In this project, we’re stepping up the power. Using the classic BD139 transistor and a rock-steady crystal oscillator, we’ll build a transmitter that balances simplicity with performance. Whether you’re a Part 15 enthusiast or just want to experiment with AM modulation, this circuit is the perfect way to become your own local broadcaster. Let’s get on the air!
Build a Simple 40 Metre CW Transmitter Using 2N2222
Build a simple 40 m CW transmitter using a 2N2222 and 7 MHz crystal oscillator — a minimalist QRP design with keyed oscillator and low-pass filter for clean HF Morse transmission.
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 – […]
DIY IRF510 AM Transmitter Circuit
This blog post dives into a detailed DIY IRF510 AM transmitter circuit using the IRF510 MOSFET, perfect for radio enthusiasts and electronics hobbyists
80 meter 1W QRP Transmitter with Ceramic Resonator Control
Simple 80 m CW transmitter using a 3.58 MHz ceramic resonator for frequency stability and MOSFET power stage — ideal first HF QRP build for beginners