TA31137FNG TA31137FNG circuit

This low-power video transmitter is designed for remote control (R/C) applications, surveillance, or amateur radio purposes. It utilizes seven transistors within a crystal oscillator-multiplier RF power amplifier chain, along with a high-level video modulator. A supply voltage of 9 to...

tv transmitter circuit

Here is a simple schematic of a TV transmitter circuit, or video transmitter circuit, capable of broadcasting in the VHF range from 60 to 200 MHz. The input video source can be any CCD camera or VCR. The output power...

Receiver monitor

The alarm connects to the earphone jack on a receiver. When a signal, typically sent to the headphones, is detected and applied to the gate of SCR1, it conducts, activating the alarm connected to SOI. The signaling device can be...

Interfaces For The Remote-Control Transmitter Circuit

Several possible interface circuits are presented for use with a remote-control transmitter. The circuit labeled A demonstrates a typical FM stereo MUX decoder with a load connected directly to the open-collector output of a TA7343 PLL. The circuit labeled B...

Wireless Headphones Transmitter Circuit

This wireless headphones transmitter ensures quality reception over a distance of 2 meters. The oscillator frequency ranges from 1750 kHz to 3500 kHz, and for the antenna, it... The wireless headphones transmitter operates within a frequency range of 1750 kHz to...

RF oscillator uses current-feedback op amp

A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower in practice, a symmetrical emitter follower. The configuration samples the output current, converts it to voltage across...

RF Dummy load

The load described here is capable of handling up to 10 watts of RF power for a couple of minutes and is designed for the widely used 50 ohms impedance. It consists of ten parallel connected 560 ohms 1 watt...

SENSITIVE RF VOLTMETER

This schematic illustrates a peak-reading diode voltmeter that is powered by two amplification stages. A 100 µF capacitor is utilized to create a substantial time constant, which ensures effective damping of the meter. The restricted differential output voltage, combined with...

Remote Control Transmitter Circuit

This transmitter can be utilized for multiple applications. An INS8048L microprocessor produces various codes based on keypad inputs. These codes are modulated onto a 40-kHz carrier frequency. Additionally, Q1 drives infrared LEDs LED1 and LED2. The transmitter circuit primarily consists of...