As shown in the figure, R1, R2, and C2 form an astable multivibrator with an oscillation frequency of f=1.44/(R1+2R2)C2, and most of the corresponding high-frequency oscillation frequencies are about 70 kHz. The high-frequency square wave signal output from the 3-pin is passed through the current limit, and is applied to the VT tube to be transformed, and the lamp is ignited after being boosted.
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