S-Video / Pal Video Converter ----- Video Converter

Keywords: S-Video / Pal video converter circuit, video converter production S-Video / PAL video converter Many views, like devices, have a video output terminal of S-Video. Such as cameras, satellite TV receivers, etc. The purpose of this article. It is to introduce a simple circuit (as shown in Figure 1), which converts the S-VIDEO system to the PAL system is located. 1. The principle of circuit work is actually. The work we have to do is transmitted by mixing the brightness and chroma signal in the S-VIDEO standard, and avoids cross-modulation due to signal combination of these two different properties. The chroma signal in the S-VIDEO signal corresponds to the color component of the PAL signal. Similarly, the brightness signal in the S-VIDEO signal can be seen as the brightness component in the SECAM or PAL signal, and the video signals of the two independent components are two A matching resistor is input to the input of the mixer. The mixer is achieved with a typical op amp KE5534. Direct Futong, no DC capacitance is used when both signal is sent. To avoid all kinds of issues that have changed when the average DC component of the useful signal occurs. The output also passes through a 75Ω resistor to match the connection cable. In the video channel, there is also a - a potentiometer. Adjustable levels to achieve contrast of the adjustment image. The power supply of the adapter is a + 8V and -8V voltage supplied by two regulators. The negative power supply can also be -5V. Typically, the output signal value is mostly positive. 2. The converter creates an input signal is a four touch socket for a S-VIDEO video terminal, and the output is a common RCA output socket. At installation, pay attention to the polarity of the filter capacitor, the direction of the power supply.

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