Rocket Crystal Radio

This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable one. The described circuit operates as an amplified crystal radio receiver, which utilizes a...

In the first circuit, the BC548 transistor is configured as a Colpitts oscillator, with the frequency being adjusted through the use of a crystal. A high-quality crystal will produce high-frequency oscillations, and the output at the collector is rectified...

The logical first choice was to start with simple regenerative circuits, utilizing one or two transistors and possibly a basic audio amplifier with a single integrated circuit. A few simple tube radios purchased at flea markets will delay any...

A typical liquid crystal display inverter circuit (OZ965) is primarily controlled by the OZ965 chip. It includes a driving field effect transistor (U2), a step-up transformer, the backlight socket, and associated circuitry. A 5V DC voltage is provided by...

This project utilizes DTMF (dual-tone multi-frequency) signals, commonly used in telephones for dialing digits, as control codes. The DTMF tones are employed for frequency modulation of the carrier signal. At the receiver unit, these frequency-modulated signals are intercepted to...

This is not a cell phone jammer. Jamming a cell phone operates on similar principles, but requires a different construction, necessitating a frequency range from 800 MHz to 900 MHz. An operational amplifier and several other components are needed,...