FIELD: television engineering. SUBSTANCE: device has three preamplifiers 1, switching block 2, metal-oxide semiconductor tetrode 3, first voltage divider 4 with first and second resistors 5, 6, second voltage divider 7 with first and second resistors 8, 9, resistor 10, switching diodes 11, third voltage divider 12 with first and second resistors 13, 14 and protection diodes 15. EFFECT: more simple construction. 5 cl, 1 dwg
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