| 摘要 |
PURPOSE: A circuit for stabilizing the control grid voltage is provided to regularly maintain the control grid voltage(G1), even when the amount of the beam current flowing on a CRT(Cathode Rag Tube). CONSTITUTION: A circuit for stabilizing the control grid voltage of a monitor has a high voltage circuit, providing the AC(Alternating Current) voltage, outputted from a FBT(Fly Back Transformer), through a diode and a capacitor by negatively rectifying. The high voltage circuit comprises: a PNP-typed first transistor, which a terminal of a collector receives the negative DC(Direct Current) voltage from the high voltage circuit, and which a picture tube of an emitter terminal is connected to a control grid; a PNT-typed second transistor, which a terminal of a collector is connected with a base terminal of the first transistor, and which a terminal of an emitter is grounded through a zener diode; a first resistor for connecting the terminal of the collector from the first transistor with the base terminal; a second resistor, which one terminal is connected in parallel between the second resistor and the base terminal of the second transistor, and which the other terminal is grounded; a third resistor, which one terminal is connected in parallel between the second resistor and the base terminal of the second transistor; a fourth resistor, which one terminal is connected in parallel between the zener diode of the picture tube and the emitter terminal of the first transistor.
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