TV crystal category

Crystal Ceramic Surface 3225G (3.2*2.5mm) 8.000MHZ 10PFK

Crystal oscillators are among the most commonly used electronic components in various devices, especially in digital systems, communication equipment, wireless routers, remote controls, and television sets. These oscillators provide stable clock signals that are essential for proper operation. In this article, we'll explore five different types of crystal oscillators used in TV circuits, helping you better understand their functions and applications.

1. Ceramic Crystal Oscillators for Remote Control Applications

Remote controls rely on a clock signal to generate and transmit infrared commands. This clock signal is produced by a ceramic crystal oscillator, often operating at frequencies like 455 kHz or 480 kHz. Common models include CSB480A and CSB480A1. These components are crucial for ensuring accurate command transmission between the remote and the TV.

2. Quartz Crystal Oscillators for Microprocessor Circuits

The microprocessor in a TV processes incoming signals and controls system operations. To function properly, it requires a precise clock signal, usually generated by a quartz crystal oscillator. Frequencies such as 1 MHz, 4 MHz, 8 MHz, and 12 MHz are common, with 4 MHz being the most widely used. These oscillators ensure smooth processing and timing within the TV's control system.

3. Quartz Crystal Oscillators for Color Subcarrier Circuits

To display color images, TVs require a subcarrier signal, typically at 4.43 MHz for PAL systems. This frequency is generated using a quartz crystal oscillator, which plays a key role in demodulating the color information from the received signal. Popular models include 4.43X, A74994, FQC4.433619, and others. For NTSC systems, a 3.58 MHz signal is used instead.

4. Ceramic Crystal Oscillators for Line Oscillation Circuits

Line oscillation circuits are responsible for generating horizontal scanning signals that help create the image on the screen. These circuits typically use ceramic crystal oscillators operating at 500 kHz or 503.5 kHz. Models like 500F2, 503A16, and CSB503F2 are commonly found in these applications. They ensure the correct timing for the electron beam to scan across the screen.

5. Ceramic Crystal Oscillators for Audio Circuits

In TV audio systems, ceramic crystal oscillators are often used to generate a 500 kHz reference signal. This helps in processing the intermediate frequency signals (such as 5.5 MHz or 6.5 MHz) and converting them into a standard 6 MHz signal for easier audio processing. Common models include CRB500E and 2500K. However, it's important to note that these 500 kHz oscillators are not interchangeable with those used in line oscillation circuits due to differences in performance requirements.