One-button Biostable Switch Circuit

Published:2011/7/21 10:21:00 Author:Joyce | Keyword: One-button , Biostable , Switch | From:SeekIC

As shown in the figure, 555 is the core of the circuit. Pay attention that R1 = R2 = 47 k Ω and the trigger end feet 2 (set ) connected to 555 and the threshold level end feet 6 (reset); Resistance R3, capacitance C2 for charge and discharge are connected to the output end feet3, and are linked with feet 2 and 6 through the switch. When S disconnects, feet 2, 6 are both 1/2 VDD = 6 V, therefore, the level of feet is random, sometimes it is high, and sometimes it is low. If feet 3 is a high level (about VDD-1. 5 V = 10.5 V), pressing S will add the charge voltage on C2 to feet 6 , to make it higher than trigger level 2/3 VDD, then 555 will be reset, and feet3 will become a low level.



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