Video splitter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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The proposed device is designed to record video programs on multiple VCRs simultaneously. This video splitter is active and eliminates the mutual influence of VCRs on each other.
Matching modules are made on BA7604N chips. They are designed for switching video signals in the interface devices of VCRs and TVs at low frequency. Each microcircuit contains two identical amplifiers, designed for a 75-ohm load. With such a load, they have unity gain. At the same time, the inputs of the amplifiers are quite high-resistance, which makes it possible to connect an almost unlimited number of such modules to one 75-ohm output, for example, of a VCR.
Video and audio signals are input through the "Video In" and "Audio In" connectors, respectively. The inputs of all microcircuits are connected to these connectors. Output impedance of video outputs of modules - 75 Ohm. The nominal level of the input and output video signals is 1 V, the frequency response is linear in the range of 0,05...6000 kHz (with 1 dB unevenness).
The video splitter is powered by a 5 V source, consuming a current of about 1 A.
Literature
- Radio designer, 2002, No. 2, p.19.
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