Discover the magic of “no-power” radio! Step-by-step instructions on building a crystal set that runs entirely on the energy of the radio waves it receives.
Circuits
The Circuits category focuses on stand‑alone electronic building blocks that power your radio and audio projects: amplifiers, oscillators, filters, keyers, indicators, test jigs, and more. Instead of full transceivers or big systems, you’ll find focused designs like microphone preamps, push‑pull HF linear amplifiers with IRF510, regenerative receivers, short‑wave transmitters, low‑battery indicators, and timing circuits
DIY Lithium-Ion Solar Charger for 2-Cell Batteries
Harnessing solar power to charge lithium-ion batteries is not only energy-efficient but also an eco-conscious choice for portable electronics. In this article, we explore a compact and reliable lithium-ion solar charger circuit that uses a few standard ICs: LM2941, LM3420-8.4, and LMC662. Designed for charging a 2-cell Li-ion battery pack, this setup is ideal for […]
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
Incandescent Lamp Flasher using IRF510 HexFET
The circuit Incandescent Lamp Flasher is built around two FETs, which are configured as simple astable multivibrator to alternately switch two lamps on and off.
Signal Booster enhancing RF Performance of radio receiver
If your receiver needs a higher level of signal across the entire matching network, this signal booster circuit can furnish the solution. This Signal booster circuit, built around a few transistors and support components, offers an RF gain of about 12 to 18 dB from about 100 kHz to over 30 MHz
Simple Signal Grabber Circuit for shortwave reception
If you’re working with RF circuits and need to improve signal reception or create a compact antenna solution, the Signal Grabber circuit is an excellent project to tackle. This clever design creates a short pull-up antenna that delivers impressive performance in a small package. The Signal Grabber is a specialized RF circuit designed to create […]
Simple DIY Active Antenna for Crystal-Clear Reception
Tired of static on your AM or shortwave radio? Do you struggle to hear distant stations? There is a simple fix. You can build a special antenna that makes radio signals much stronger. This guide shows you how to build a DIY active antenna. It is a fun project that can give you crystal-clear reception. […]
Crystal tester with a Simple Oscillator Circuit
This crystal tester method lets you confirm a crystal’s “active” status by comparing its output to a known good crystal available
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
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.