Copy protection device of video cassette recorder

摘要

This old case is about the duplicating device of the video recorder, especially the device which can prevent the temperature from changing by mistake by duplicating a large number of video tapes, such as the forced duplicating device unrelated to the duplicating device.;For this purpose, the video signal is kept at a certain automatic gain adjusting unit,The automatic gain adjusting part of the capacitor is connected to a capacitor with charging current,In the VCR duplicating device which provides a current circuit with a certain current at the automatic gain adjusting position,This is a temperature compensation meeting to restrain the temperature change between the capacitor and the power cut circuit, which causes the current and voltage change of the temperature circuit of the power cut circuit.