555 overvoltage indication circuit

Published:2012/10/16 21:54:00 Author:Ecco | Keyword: 555, overvoltage indication | From:SeekIC

As shown in Figure 24-10, 555, R1, RP1 and C1 form astable multivibrator, but its ground pin is connected to c pole of detection transistor. When the monitored voltage exceeds set value, DW is breakdown, VT1 is saturated and turned, then 555 starts oscillation, LED light flashes. VT1 can also reduce the static power dissipation of 555. 555 oscillation frequency can be adjusted between 1 ~ 20Hz, and RP1 can be used to select the flashing number of LED.



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