Bidirectional thyristor detection circuit
As shown in Figure NE555, R1, R2 and C1 constitute a pulse oscillator, the output pulse frequency is 1Hz, the duty cycle is approximately equal to o. 5 square wave pulse. After this pulse is output, the first path is applied to the anode of the triac via LED1, the second path is applied to the gate of the thyristor via R3 and SB, and the third path is applied to the base of VT1 and VT2 via R5. At this time, if SB is pressed, the pulse signal is applied to the gate of the thyristor through SB. If the triac is good, when the high level output of the pulse, VS will be forwarded and VT2 will be turned on. The pulse output by the power supply through the NE555 conversion passes through LED1 → R4 → VS → VT2 to form a path, and LED1 emits light. When the pulse is output low, VS will reverse the conduction, VT1 will also be turned on, and the current will form a path through the internal circuit of VT1 → VS → R4 → LED2 → NE555, and LED2 will emit light.
The biggest difference between Home Theater Projector and ordinary business projectors is the resolution and ease of use. Most of the mainstream Home Theater Projectors have a resolution of 1080P Full HD, and are equipped with an intelligent system, which makes the projector more convenient to use. Home Theater Projector mainly pursues brightness, color, and contrast, which can bring users an immersive and realistic experience.
Features
1. Large screen: The size of traditional LCD TVs is mostly between 40-70 inches, while the Home Theater Projector can easily project 100-150 inches of screen content.2. Diverse uses: Home Theater Projector will be equipped with intelligent systems, which contain a large number of film sources. In addition, the projector can also be connected to different devices through different interfaces, such as game consoles, computers, U disks, etc. Only one machine can realize online drama, listening to songs, games, office and other functions.
3. Diffuse reflection eye protection: Home Theater Projector uses the principle of diffuse reflection to form images, which is less harmful to the eyes than the LCD screen.
4. Diverse usage scenarios: Home Theater Projector can adapt to different sizes of bedrooms, living rooms and even dedicated audio-visual room scenes due to its different brightness.
According to the increase of people's needs, the forms of Home Theater Projector are also becoming more and more diverse. In the past, people's impression of Home Theater Projector was mostly a square box placed on a cabinet or suspended from the ceiling, but there are already portable projectors that take into account both the sense of use and the size. In addition to portable micro-projectors, larger home laser TVs are also developing rapidly. Many users have abandoned traditional LCD TVs and opted for home projectors when decorating. It can also be seen from this that Home Theater Projector has a trend of gradually replacing LCD TVs.
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