555 timer problem

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Worlddisgrace

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my 555timer output seems to have been red and bitten, but the circuit is able to run in NI Multisim ,

Please tell me why is my 555 timer output red.. if u know


THANKSDD
 
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Look at the picture i attached , at the 555 timer output, it turns out to be red ><!

Any idea why?
 

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U9A, and perhaps many other locations, is in wiring conflict with pin 3 of the 555. Both are positive outputs, and many sims won't put up with that. Check the help section of yours for a definition.
 
Why do the schematics have so many wires crossing and uncrossing, going up down left and right, zigging and zagging and basically going all over the place? Each wire should be a straight line.
There is one wire that completely circles the 555. Why?
 
The output of the 555 is blowen, kaput
perhaps post the multisim file.
looking at the schematic and being a nerwbi with multisim trying to figure out what X6 is. looks like an LED?
what is this circuit supposed to do? a two digit counter?
 
audioguru said:
Why do the schematics have so many wires crossing and uncrossing, going up down left and right, zigging and zagging and basically going all over the place? Each wire should be a straight line.
There is one wire that completely circles the 555. Why?
Click to expand...

multisim likes to make a path on it's own, regardless of what the user wants. the problem is that when a part is moved all of the connections change their positions as well. it's not the best system in the world (especial when a simulation error occurs) but it can get the job done.
 
MrDEB said:
The output of the 555 is blowen, kaput
perhaps post the multisim file.
looking at the schematic and being a nerwbi with multisim trying to figure out what X6 is. looks like an LED?
what is this circuit supposed to do? a two digit counter?
Click to expand...

X6 is a lamp probe
 
Thanks all for the reply.
It really helps.
I am a freshman in electronics.
This circuit is actually a counter, that will count up to 5 and then down to 0 , but i want to set a monostable 555timer for a time delay at 5. meaning 1-2-3-4-5 (stops for 3sec) then count down .

Anyone can help me with the 555 mono, i look at many online schemetics, tried and failed many times, but i'll keep trying.

Thanks all for your reply.
 
i think i know what your problem is, you have the output of an AND gate feeding into the output of your 555 timer, if i'm not mistaken then the 555 is not capable of sinking that much current. add a diode to the output of the 555 and the AND, so that they still trigger a clock pulse. Also, if you are a newbie to electronics, then how were you able to make this circuit?
 

multisim usualy has a "circuit builder" under the Tools tab, in there their is a 555 timer wizard that can construct monostable and astable 555 circuits.
 
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