Kinescope black level current sensing apparatus

Details Kinescope black level current sensing apparatus Kinescope black level current sensing apparatus

H - Electricity

04

N

350/83

H04N 5/57 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1199103

Abstract In a television receiver including an automatic kinescope bias (AKB) control system, a kinescope cathode is driven by a video output amplifier. A feedback network is provided from the output to the input of the amplifier. A sensing resistor is included in the main current conduction path of the amplifier. During AKB operating intervals, a cathode output signal proportional to the cathode black current level is coupled via the feedback network for varying the amplifier conduction such that a voltage developed across the sensing resistor is proportional to the black current representative cathode output signal. This voltage is utilized to control the cathode bias to maintain a desired black current level.

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