Working principle diagram of self-made video switcher
The circuit principle is shown in the figure below. The core of the circuit is a video switching circuit MAX454. It has good quality output image and very low phase distortion. The circuit contains 4 video inputs (IN0 ~ IN3) and a low input impedance line amplifier, driver, two address inputs (A0, A1), a video output and two power terminals. The surveillance lens is connected to the video input of the switch via J1-J4. The 75Ω resistor constitutes the input termination resistance. The gain of the internal amplifier is set by the feedback network connected to pin 13 of IC1. The feedback network consists of R5-R8 and C3. The gain is set to 2 to compensate for the consumption on the terminating resistor R9 (75Ω). Finally, the gain at output J5 is 1.
ZhenHuan`s Aluminum Case Junction Box Led Driver is constant voltage mode, UL class 2 rated and designed to operate with any standard MLV/Incandescent TRIAC (Leading edge) dimmer switch. The 12V/24V led driver is encased in a low profile aluminum enclosure that includes 2 knock-outs to enable easy installation makes it the perfect choice for under cabinet lights, tape lights and various LED fixtures installations. High power factor and efficiency of 90% allows the driver to operate at low temperatures.
Aluminum Case Junction Box Led Driver
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