Scan-frequency-dependent drive signal amplitude in a horizontal deflection circuit for a multi-mode monitor

摘要

A horizontal deflection circuit for a multi-mode monitor includes an oscillating section 100 for receiving an externally-supplied horizontal sync signal and for generating an oscillating signal. A horizontal driving section 200 is provided for amplifying the oscillating signal in accordance with an amplitude of the externally-supplied voltage source Vcc and for generating a driving signal. A microprocessor 300 is arranged to determine the mode in accordance with the frequency of the externally-supplied horizontal sync signal and for outputting a control signal CS to control the amplitude of the driving signal in accordance with the determined mode. A driving signal controlling section 400 is connected to an output terminal of the microprocessor 300 for determining the amplitude of the driving signal in accordance with the control signal. A horizontal output section 500 is arranged to be switched on and off to generate a horizontal deflection signal of sawtooth waveform, and to supply the generated horizontal deflection signal to a horizontal deflection coil HDY.