| 摘要 |
PURPOSE:To make it possible to adopt a series regulator system, as a power source circuit of horizontal output circuit, which hardly makes a disturbance on picture planes by providing a power source control circuit to allow a power source voltage to vary saw-toothwise every frequency block unit. CONSTITUTION:A synchronous signal from an external connecting apparatus is fed to a horizontal oscillating circuit 4 through a frequency-voltage converting circuit 2 as well as a low pass filter circuit 3 and a horizontal oscillating output is fed to a horizontal output circuit 7 via a horizontal driving circuit 6. The circuit 7 are composed of an horizontal output transistor Q, oscillation capacitors Ca-Cc, a deflection coil L, a dummy coil Ld and the like and power source control circuits 23 connected with a power source circuit 22 of the series regulator system allow the power source voltage to vary saw-toothwise every frequency block unit which is determined in advance towards frequencies of horizontal synchronous signal input converted into output voltage of the low pass filter circuit 3. A mode discrimination circuits 8 discriminates deflection mode, depending upon an output of the low pass filter 3 and control to close switches Sa-Sc. |
