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555 hig voltage delay time contact controlled circuit

2015-01-29 10:39  
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555 hig voltage delay time contact controlled circuit
This circuit is always used in the occasion that the filament need preheat in the vacuum tube equipment. It makes the filament has adequacy time to avoid the cathode added the high pressure under the cold state. As shown on the figure 9-48, the 555 is in the reset mode because the C1's voltage can't mutant. The 555 will reset with the C1 charged when the 2 foot's potential is lower than 1/3VDD. The 3 foot will be the high power level and the J will be pull-in. The contact will contact the high voltage. The delay time, td=1.1RP1C1. The max delay time is about 4 minutes and can use the RP1 to change.