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My timer 555 circuit isn't working well

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My timer 555 circuit is not working properly (please see the uploaded Multisim file). When switch S2 is opened, it gives a square wave output but when the switch is closed, it gives a continuous output. Also, when switch S1 is opened, the circuit gives a low output but when the switch is closed it gives a continuous (HIGH output). I am using Multisim 14.1.0 Education version.

 

Is anything wrong in my design? What should I do to correct it?

 

Thanks.

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