How to invert output of NE555?

Ok, so it's a inverted Monostable how ever, with what the OP stated using the trigger input, one would assume that the cycle needed completing even if the source that triggered the event goes off before the sequence is complete.. sort of a pulse stretcher. Seeing that the trigger input was being used, a low logic signal is obvious here and the trigger input will maintain the cycle once operating.

The op stated 1 sec inverted pulse. That kind of tells me something.

Maybe edge triggering on the THRESHOLD of a common monostable with the TRIGGER wired to the DISCHARGE and RC network would be better. But then again, the op never really indicated the logic state that should start the cycle. Using the TRIGGER input only assumes a logic 0, if the op is aware of its internal operations (PNP). THRESHOLD being a (NPN).

The problem I have is, the timer can do so many things and if the requested information supplied is brief, it leads to a lot of different variations of what can happen and what will happen.. In other words, more detailed information needs to be supplied in the questionnaire to convey to the community clearly, so that a proper circuit can be designed . I find that many overlook side effects if they don't get the target design clear to start with.

Jamie

Yes, and I just ran your .ASC file through a program I wrote to create the ASCII, automatically pasting it to the clipboard.

Jon

Oh, I have no problem understanding how it works, I think the opposite here is the problem. Many are over looking side effects and problems with that circuit.

No duration was not indicated here and yes, I did miss the part about the low pulse being used on the trigger. Sorry I over looked that how ever, it does not excuse the fact that this circuit has issues when the input pulse duration is not indicated. If you look hard enough I think you'll see the problem.

Think Edge triggering.. !

Jamie

I started to write a ASC converter program for Ltspice and lost interest. Doing this in delphi is a simple matter how ever, my approach was to monitor the folder the project was being updated/saved in using the windows Folder Change API calls. The clipboard feature would be nice how ever, I have other things operating on the desktop while I am logged in that uses that feature automatically and I think it would interfere with it. I suppose I could finish it, it would make it simpler for me to throw things on the group here instead of trying to explain myself. Must be the reason why GUIs were invented ;)

Jamie

If you say so, I guess I see things you don't.

Jamie

Correct, I don't harp on what you can't see. It's inadequate for anything I would use. Did you ever stop and think what would happen if the input pulse duty cycle exceeded the 1 sec output required? Did you ever ask yourself that maybe the op wants it to pulse 1 sec regardless if the input pulse was short or maybe held on for some longer period?

Using Edge triggering would solve all those problems but you don't seem to understand that.. Or maybe you just assume a sloppy variable length pulse on the output is just fine.. Hell, if that is the case, why bother with a dame timer? Just stick a RC circuit in there.

Now that sounds about as ridiculous as you not seeing what I am trying to point out.

Have a good day.

Jamie

Yes, you do. Like right now.

It's inadequate for

He already covered that, but you didn't notice or recognize the significance of his response due to your lack of technical knowledge.

So, you don't simulate circuits? If you did, you would see what it's all about.

Ridiculous is what you are for attempting to argue with someone far superior to you. Only a dummy does that.

I feel certain he will, and so will we all. Can't say the same for you.

Oh, yeah. Jamie. The embarrassment of the ham community. What a shame you are.

BTW at least in my newsreader (SeaMonkey), you can add .asc files as attachments to the post, and have it appear as a clickable attachment even on text NGs--on Windows, LTSpice comes right up. (Apologies to any residual tin and pine folks, who probably see big steaming piles of HTML when this happens.)

Cheers

Phil Hobbs

Correction seen. Thank you all for your help!

Ha Ha Ha,.

You should stay out of what you don't understand.

I would never use that flawed circuit, if I wanted a consistent pulse response on the output. You see, you are like a lot of the sheep around here that follow who you assume to be always correct. That is only because you know no better.

I've used 555's/6 for so many different things over the years in industrial functions where semi accurate response and reliable behavior is required and I can tell you, that circuit would not be seen in anything I would use other than maybe a toy for a kid.

The fact do you don't see this flaw, should tell you to stay out it, it only makes to deteriorate your image even more. Lets not even talk about Ham radio here, you are only talking about yourself when you say "Embarrassment", that you are.

I don't care what you do here, you can follow these miss guided sheep here all you want how ever, I take it very seriously when you think you can judge me when you can barely crawl..

Maybe you should pay a visit to our site one day and we could show you how to break down a 2Mev Irradiation Xlinking process machine. Yes, lets break down the dyno, scan amplifiers, 350kWatt oscillator along with its inner components, many of which have lots of my handy work in it and yes, many 555's used through out in configurations you never thought could happen.

Let me ask you this, do you really think they would allow me to do this level of work on multi million dollar machines generating dangerous emissions with in, if I didn't know what I was doing?

Sorry that you have to be a sap, I guess every organization must have them.

Jamie

You must be a clone of Dimbulb.

They share a single brain cell.

Thanks, Michael. That makes sense.