555 neon light high-frequency high-voltage source circuit

Published:2011/5/21 22:14:00 Author:TaoXi | Keyword: neon light, high-frequency, high-voltage, source circuit | From:SeekIC

This power supply uses one piece of the time base circuit 555 as the core. The circuit is as shown in figure 17-63. The multivibrator is composed of the 555 and R1，R2，C2, the oscillation frequency f=1.44/(R1+2R2)C2 The oscillation frequency of the parameters in the figure is 17.8kHz, the output pulse's duty cycle is about 1:1. The output of 555 is cut by D3 and then drives the high frequency amplifier VT1. This amplifier connects with the base electrode D3 and the LED1, so it's working condition is C-class. C5 can be used to prevent the reverse peak voltage, and it protects the transistor VT1. The secondary stage of the amplifier transformer can output the high-frequency voltage of 12500V, and this voltage can turn on the 3 ~ 6 meters neon light.



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