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.
Tag: Electronics projects
A collection of DIY electronics and radio-circuit builds, including transmitters, receivers, audio processors, RF amplifiers, test instruments, and practical hobby circuits with schematics, components, and step-by-step construction details
Build Your Own High-Res FM Receiver: The DIY CYD 480×320 FM Radio Project
DIY ESP32-S3 CYD 480×320 FM radio with SI4732 DSP and touchscreen tuning. High-resolution Arduino receiver project with scan and preset features.
The Simple RF Indicator: A DIY Tool for Detecting RF Signals
The image depicts “Simple RF Indicator,” passive device for detecting radio frequency (RF) signals in coaxial cables. It’s a clever hack using basic components
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.
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 […]
Pink Noise Generator Circuit Using 741 Op-Amps
Learn how to build a pink noise generator using 741 op-amps for audio testing and frequency response analysis, a simple Pink Noise Generator Using 741 Op-Amps
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.
Building a Classic Untuned Field Strength Meter
Radio frequency work can be tricky business, especially when you need to measure signal strength without the complexity of tuned circuits. Enter the untuned field strength meter (FSM) a simple effective tool that every electronics enthusiast should have in their toolkit.
Ham Radio Repeater Toneburst Module circuit
Ham Radio Repeater Toneburst Module generates a precise 1750Hz toneburst lasting 0.5 seconds, essential for accessing UK and European amateur radio repeaters.