| 摘要 |
PURPOSE:To make an output voltage constant by inserting a diode between an input and ground of an automatic color saturation control circuit. CONSTITUTION:An output from a burst gate pulse generating circuit 1 passes through a resistance R1, diodes D1, D2 are inserted between the input and ground and a signal is applied to a burst gate transistor (TR)Q1 from both terminals of the diodes D1, D2 by dividing a voltage by resistance R2, R3 in the automatic color saturation control circuit comprising the TRQ1, an emitter follower TRQ2, a TRQ3 for ACC amplifier, a bias TRQ4, a coupling capacitor C1, emitter resistors R4, R5, a collector resistor R7 and a smoothing capacitor C2 or the like. Thus, even if the level of an output pulse of the burst gate pulse generating circuit 1 is changed because of fluctuation in the power supply voltage Vcc, a pulse having a prescribed level is applied to the base of the TRQ1 so as to make the output of the amplifier circuit constant. |
