| 摘要 |
A secondary sinding of the flyback transformer is divided with 2 parts; the one part is connected with the first rectifying diode connected with the anode of the CRT, the other part is connected with the second rectifying diode having the same direction of the first diode. The cathod of the second diode is connected with a focus electrode of the CRT and a focus condenser in parallel. As the focus condenser is connected with a variable volt. dividing cct. generating flyback pulse, the focus D.c volt. generated on the connection point of the second diode and the focus condenser is varied depending on the variation of the high volt.
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