| 摘要 |
PURPOSE:To hold the driving conditions of a horizontal transistor (TR) optimum at all times even if a horizontal frequency varies by connecting a variable resistance element between the horizontal driving transistor TR of the horizontal driving circuit and the base of the horizontal output TR of a horizontal output circuit. CONSTITUTION:The output of a horizontal oscillation circuit 1 is connected to the base of the horizontal driving TRQs to drive the horizontal driving circuit 5. A horizontal driving transformer (HDT) 3 is connected to the collector of the TRQs of this horizontal driving circuit 5. A diode 7 and the variable resis tance element 4 are connected in parallel between the secondary winding 3b of the HDT 3 and the base of the horizontal output TRQ. This resistance ele ment 4 is so constituted that its resistance value is controlled with the output voltage of an F/V circuit 2. For the purpose, the resistance value of the resis tance element 4 is controlled to hold the driving conditions of the TR Q opti mum at all times even if the horizontal frequency varies. |
