| 摘要 |
A power supply cct., which allowed the image signal and power source for a T.V. camera to be carried on the same coaxial cable and prevented accidental connection of the power source and the monitoring wires, was devised using the phenomena that the change of the load impedance is bigger at low volt. than the oper. volt. of the T.V camera. The oper. Volt. is supplied to the load after checking the load by detecting the volt. at the juncture of the load and the impedence element.
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