Brief introduction to circuit principle
Circuit principles are divided into electronic circuits and "power circuits", which are generally referred to as "strong current" or "weak current" circuits; it refers to the path of the circuit in terms of manufacturing, work, and maintenance, as well as current paths. The size, direction, and current control method of the related conditions and information, if expressed in the form of drawings or diagrams, are called circuit schematics. Therefore, this course of circuit principle should be devoted to this knowledge. The principle of high-frequency circuit is based on the basic knowledge of electricity, explaining the circuit knowledge of the alternating current (alternating current) category, the current change cycle is "very short" and the frequency is high-frequency current.
High frequency circuit composition and principle
Passive components or passive networks in high-frequency circuits mainly include high-frequency oscillating (resonant) circuits, high-frequency transformers, resonators and filters, etc., which complete the functions of signal transmission, frequency selection, and impedance transformation.
The high-frequency oscillating circuit is the most widely used passive network in high-frequency circuits. It is also the main component of high-frequency amplifiers, oscillators and various filters. It completes tasks such as impedance transformation and signal selection in the circuit, and can be directly used as Load usage.
The oscillating circuit is composed of inductors and capacitors. An oscillating circuit with only one circuit is called a simple oscillating circuit or a single oscillating circuit, which is divided into a series resonance circuit or a parallel resonance circuit.
Application of different high frequency circuits
1. High frequency amplifier circuit.
Role: used to amplify high-frequency signals
2. High-pass filter.
Function: A circuit that allows high-frequency signals to pass and prevents low-frequency signals from passing
3. High frequency oscillator.
Function: A circuit that can generate high-frequency signals or frequencies
4. High frequency transmitting circuit.
Function: A circuit used for radio communication to transmit a band communication signal
5. High frequency absorption circuit.
Function: A circuit used to absorb a certain high-frequency signal or frequency
Audio Video Cable:Video cable, referred to as video cable, is composed of video cable and connector. Among them, video cable is coaxial shielded cable with characteristic impedance of 75 Ω (Ω). Common specifications are divided into - 3 and - 5 according to wire diameter, single core wire and multi-core wire according to core wire, common specifications of connector are divided into pressure joint and welding joint according to cable end connection mode, and equipment There are BNC (commonly known as bayonet) and RCA (commonly known as lotus head). Audio cable, referred to as audio cable, is composed of audio cable and connector. The audio cable is generally a dual core shielded cable, and the common connectors are RCA (commonly known as lotus head), XLR (commonly known as XLR head) and trsjacks (commonly known as pen plug).
Audio Video Cable
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