Radio Circuits Blog
This site provides schematics of various radio projects that you can experiment yourself.
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Tuesday, 12 May 2026
OXO QRP HF Transmitter
The OXO QRP HF transmitter is a simple, low-power CW (continuous wave) transmitter designed by George Burt, GM3OXX. It is a single-band transmitter that can be built to operate on any of the amateur radio bands from 160 to 20 meters. The transmitter is built around a few standard transistors and a crystal oscillator. It is an elementary circuit to build, and can be assembled from a kit or from scratch.

The OXO transmitter is a QRP HF transmitter, which means that it produces a very low output power. This makes it ideal for making short-range contacts with other amateur radio operators. The OXO transmitter can also be used for experimentation and learning about radio electronics.
TL071 Audio Compressor Circuit
The TL071 operational amplifier makes an excellent foundation for DIY audio compressor circuits. This single-supply design TL071 Audio Compressor offers reliable dynamic range control for musical instruments and recording applications.
Audio compressor for microphone
This circuit diagram illustrates an audio compressor for microphone signals. Its primary job is to even out the volume of your voice, making soft sounds louder and loud sounds quieter, resulting in a more consistent and professional audio output. This is incredibly useful for podcasts, voice overs, amateur radio, or any application where microphone levels can fluctuate.

