Television Circuits | Next Electronics

The brightness of the indicator lamp changes in accordance with the modulated RF signal. Adjust resistor R2 while the transmitter is on (modulated) until the lamp flashes in sync with the modulation. Cl = 5 pF, C2 = 100 pF, Dl...

rf modem robotics project using pic16f84 microcontroller

RF technology is an exciting field to incorporate into electronic designs. However, for beginners, constructing reliable RF transmitters and receivers can be challenging. RF (Radio Frequency) technology plays a crucial role in modern communication systems, enabling wireless data transmission over various...

Active Antenna

Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficult to match impedances over a decade of frequency coverage. Instead, input stage Q1 is...

Bandswitched Grid Dip Meter

This circuit is designed for checking resonances in tuned circuits, antennas, and similar applications, covering a frequency range of 2 to 20 MHz. Q1 acts as an oscillator that can be tuned across this range using capacitor C1 and band-switched...

RF field strength meter

A simple Field Strength Meter consists of a small antenna, a detector diode, a resistor, a capacitor, and a micro ammeter. This circuit is sensitive enough to detect HF fields when positioned close to the transmitting antenna. The circuit functioned...

Four channel RF remote control

This is a simple RF transmitter circuit utilizing the Holtek HT-12E encoder chip and an AM 418MHz transmitter module (WZ-X01). The use of hybrid RF transmit/receive modules simplifies the construction of the RF remote control. The transmitter can operate with...

Antenna Booster for FM AM and SW Receiver

This AM/FM antenna booster circuit amplifies the broadband signal from the antenna. This antenna booster is designed to work for FM, AM, and SW receivers. The AM/FM antenna booster circuit is an essential component for enhancing radio reception across various...

modulation is process of changing

Modulation is the process of altering certain characteristics (such as amplitude, frequency, or phase) of a carrier wave in accordance with the intensity of the signal. The provided figure illustrates the electronic circuit of a simple amplitude modulation (AM) modulator....

Four Foot Box Loop Antenna

Please find attached your copy of my four foot unamplified box loop. It will tune from 525 kHz to about 1710 kHz covering the entire Broadcast Band. The umbrella stand described in the article is the type you would use...