| 摘要 |
PURPOSE:To achieve stable synchronizing separation without vertical HOLD adjustment, by driving a vertical oscillator with an output pulse of a monostable multivibrator provided between an integration circuit separating a vertical synchronizing signal and the vertical oscillator. CONSTITUTION:An output from a synchronizing separation transistor connected with a time constant circuit consisting of a capacitor and a resistor is inputted to an integration circuit consisting of a resistor R4 and a capacitor C2. A monostable multivibrator 4 which generates an output pulse when the output of the integration circuit exceeds a specified value, between this integration circuit and a vertical deflection circuit 2. The leading time of the output pulse waveform of the monostable multivibrator 4 is selected to a time when the output voltage of the integrating circuit reaches about 50% of the maximum amplitude, and a vertical oscillation stage 21 of the vertical deflection circuit 2 is driven with the output pulse of the monostable multivibrator 4. |
