television circuit
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2 channel RF remote control
The basic small-range remote controls are Infrared and RF (Radio Frequency). One of the weaknesses of Infrared is that the signal cannot pass through walls. Therefore, to control a garage door, an RF remote control is necessary. The circuit (transmitter...
TRF Radios
A small Medium Wave antenna from a walkman with digital radio and a variable capacitor (VC) with two sections connected in parallel from an old Russian radio (2x280pF). It has been noted that in areas with strong signals, optimal performance...
TV as display terminal interface circuit diagram
The interface circuit is placed between the computer's standard video signal output terminal and the television. It amplifies the standard 1V (Peak-to-Peak) video signal to 3V (Peak-to-Peak). The negative feedback circuit consists of transistors T1 and T2, providing a wide...
Transmitter RF Output LED Indicator
Transmitter RF Output LED Indicator Circuit Diagram. This RF output detector circuit, which includes a visual indicator, can be useful for an RF application.
The transmitter RF output LED indicator circuit is designed to provide a visual representation of the RF...
Ground pole & 2-Half-Wave Dipole Antenna
This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna. The body of the car serves as ground. It accepts load from a 50-ohm...
wave antenna circuit
The circuit illustrated here demonstrates that, despite advancements in components and technology, it remains possible to design effective and intriguing circuits. This design utilizes two well-known transistors, the BF256C and the BF494. Along with the necessary resistors and capacitors, these...
Wide Dynamic Range Field Strength Meter
A field strength meter is a useful tool for locating a transmitter. However, a sensitive field strength meter has limitations: it responds to nearly any RF signal entering its input. This characteristic reduces the effective sensitivity of the field strength...
Video Signal Carrier Circuit
In the video system shown in Figs. A and R, a single coaxial cable transmits power to a remote location, selects one of eight video channels, and returns the chosen signal. This system can select from multiple remote surveillance camera...
RF-powered sidetone oscillator
A sidetone oscillator is a specific type of audio astable multivibrator. Keying is achieved by turning the oscillator on and off through the application of a positive DC potential, which is generated from the RF signal to the reset terminal...