Multisim and Ultiboard

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multisim circuit

Hello

I will like to know what is wrong with the circuit because when the switch is on the sound is still on.

While the circuit is suppose to be that the switch is off the sound is on.

What do i need to change ? Or correct on the circuit.

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Haha thats the (in)famous LM555 timer. 

i would recommend looking at the circuitry on the datasheet of the lm555 timer.

Remember the output table and that it depends on the capacitor and the discharge of the same one (truth table). As an old professor of mine would say, Review it on paper then simulate it 🙂 i will try to emulate the circuitry on simulink.  

 So, back to the drawing board. 

 

Let me know how it goes.

Regards, 

Sigi D.

Application Engineer

National Instruments

"everything is achieveable through technology'
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