Both the 455E and 455K crystal oscillators fall under the category of ceramic crystal oscillators, which are piezoelectric components akin to quartz crystal resonators. Although they share similarities, they are essentially the same product in many cases. In TV remotes, the ceramic crystal is often a small, yellow, two-pin component, typically labeled as 455E, and is usually positioned close to the integrated circuit. Interestingly, in the market, some customers might also look for 455K crystal oscillators. Now, what’s the connection between 455E and 455K crystal oscillators? Are their parameters identical? Let me clarify this for you. Generally speaking, there isn't a specific 455K crystal oscillator. The 'E' in 455E signifies a frequency range of 401-509 kHz within ceramic crystal oscillators. Therefore, 455K and 455E can be considered interchangeable in most contexts, though variations may exist depending on the market.
In numerous remote controls, the ceramic resonant frequency is conventionally set at 455 kHz. This frequency serves as the clock source for the remote, which then divides the signal, encodes it, transmits it, and converts it into an infrared command. The ceramic crystal oscillator acts as an electronic component housed in a ceramic package, generating the resonant frequency. Its primary function is to act as a frequency generator, offering stability and interference resistance. These oscillators are widely used in various electronic devices, providing a more cost-effective alternative to quartz crystal resonators while maintaining acceptable frequency accuracy. They play a crucial role in frequency control, as all electronic devices rely on resonators for both sending and receiving frequency signals.
When testing if the crystal oscillator in your remote is faulty, it's essential to use a digital multimeter equipped with a capacitance measurement feature. Start by measuring the resistance, ensuring it shows infinite resistance using the ohmic setting. Then, switch to the lowest capacitance setting to measure the capacitance, which should be around 250pF to 320pF. If it deviates from this range, the component might be damaged. Remember, these steps help ensure the reliability of your remote control’s internal components.
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