Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Well, there is what is called a "retriggerable monostable" whereIf another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
---If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
Thanks for the replies.On Wed, 12 Oct 2011 11:07:13 +0100, mike <mike@127.0.0.1> wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
---
It does, [make sense] and the short answer is: "No."
However, there are ways to make a 555 "retriggerrable" as it's called.
Interested?
Yes interested - I've looked at several 555 design sites -not yet
found one that covers this "condition". From your replies I see both
possibilities are there with there with the 555 - an amazing piece of
design that chip - no wonder its been around so long.
it with a long pulse so you can see the output with an LED.If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
You could just breadboard it and see yourself. If you have no scope, do
---On Wed, 12 Oct 2011 07:36:04 -0500, John Fields
jfields@austininstruments.com> wrote:
On Wed, 12 Oct 2011 11:07:13 +0100, mike <mike@127.0.0.1> wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
---
It does, [make sense] and the short answer is: "No."
However, there are ways to make a 555 "retriggerrable" as it's called.
Interested?
Thanks for the replies.
Yes interested - I've looked at several 555 design sites -not yet
found one that covers this "condition". From your replies I see both
possibilities are there with there with the 555 - an amazing piece of
design that chip - no wonder its been around so long.
---On Wed, 12 Oct 2011 15:12:49 +0100, mike <mike@127.0.0.1> wrote:
On Wed, 12 Oct 2011 07:36:04 -0500, John Fields
jfields@austininstruments.com> wrote:
On Wed, 12 Oct 2011 11:07:13 +0100, mike <mike@127.0.0.1> wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
---
It does, [make sense] and the short answer is: "No."
However, there are ways to make a 555 "retriggerrable" as it's called.
Interested?
Thanks for the replies.
Yes interested - I've looked at several 555 design sites -not yet
found one that covers this "condition". From your replies I see both
possibilities are there with there with the 555 - an amazing piece of
design that chip - no wonder its been around so long.
---
OK.
Below is an LTspice circuit list that you can use to see (and edit, if
you want to) the circuit schematic and run a simulation of the
retriggerable 555 circuit.
If It's being triggered by the Trigger input, no. It will completeIf another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
---mike wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
If It's being triggered by the Trigger input, no. It will complete
the first initial cycle, how ever, you can force a reset of the time
constant if you wish.
And you, with no help in hand, intruded into the forum for whatI am sure others are going to offer you a ton of options if that is
what you need.
Don't be so ridiculous. If you think working with a timer makes someOn Wed, 12 Oct 2011 17:40:11 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
mike wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
If It's being triggered by the Trigger input, no. It will complete
the first initial cycle, how ever, you can force a reset of the time
constant if you wish.
---
Talk is cheap. How would you do that?
---
intruding? or should I say, instigating?I am sure others are going to offer you a ton of options if that is
what you need.
And you, with no help in hand, intruded into the forum for what
reason?
Intrude? I didn't ask for your opinion either. So who is doing the
---John Fields wrote:
On Wed, 12 Oct 2011 17:40:11 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
mike wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
If It's being triggered by the Trigger input, no. It will complete
the first initial cycle, how ever, you can force a reset of the time
constant if you wish.
---
Talk is cheap. How would you do that?
---
Don't be so ridiculous. If you think working with a timer makes some
one special, mainly you, then you are getting a little confused in life.
---I am sure others are going to offer you a ton of options if that is
what you need.
And you, with no help in hand, intruded into the forum for what
reason?
Intrude? I didn't ask for your opinion either.
---So who is doing the intruding? or should I say, instigating?
---Is this forum just for you and yours cronies? Is there an
initiation I must go through, rules set by yours truly?
---If I knew you were some young hoodlum I would tell you to grow up
how ever, I know that isn't the case and I find it surprising that you
would behave in such a manner that would confuse others that didn't know
you better, or maybe, we don't know you that well?
---Are you leading a multiple life there John?
Have little friends you talk to upstairs?
---Jesus john, go play your violin else where, I know far more than I
need to know about working with a timer.
---If the solutions offered were not satisfactory to the poster, I am
sure many others here, including myself would of been more than happy to
offer some other alternatives. But why waste bandwidth and time when you
know people like you are just jumping at the bit to try and impress some
one.
Not a vanilla 555 circuit. A 74123 (or HC123) is retriggerable.If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
On Wed, 12 Oct 2011 21:15:08 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
John Fields wrote:
On Wed, 12 Oct 2011 17:40:11 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
mike wrote:
If another trigger pulse comes along to a 555 wired as a monostable,
*while it is already triggered by the first pulse, does it "reset" and
start a new output (as if that 2nd pulse was the first)?
(hope that makes some kind of sense!)
tvm
If It's being triggered by the Trigger input, no. It will complete
the first initial cycle, how ever, you can force a reset of the time
constant if you wish.
---
Talk is cheap. How would you do that?
---
Don't be so ridiculous. If you think working with a timer makes some
one special, mainly you, then you are getting a little confused in life.
---
What I find somewhat confusing is why, when a question has already
been answered satisfactorily, you and your ilk find it necessary to
echo what's already been said as if it emerged, originally, from you.
---
I am sure others are going to offer you a ton of options if that is
what you need.
And you, with no help in hand, intruded into the forum for what
reason?
Intrude? I didn't ask for your opinion either.
---
Apples and oranges.
---
So who is doing the intruding? or should I say, instigating?
---
The two terms have entirely different meanings, so you'd be well
advised to consult a dictionary, (that is,if you knew how) before
unknowingly embarrassing yourself publicly.
---
Is this forum just for you and yours cronies? Is there an
initiation I must go through, rules set by yours truly?
---
Certainly not, but there are rules, set by the entire community, which
the ignorati fail to discern.
---
If I knew you were some young hoodlum I would tell you to grow up
how ever, I know that isn't the case and I find it surprising that you
would behave in such a manner that would confuse others that didn't know
you better, or maybe, we don't know you that well?
---
Confuse them???
In what way?
---
Are you leading a multiple life there John?
Have little friends you talk to upstairs?
---
Ignoratio elenchi.
---
Jesus john, go play your violin else where, I know far more than I
need to know about working with a timer.
---
Then it seems odd that, instead of sharing your wisdom with the OP,
you chose to slough the task on to others.
---
If the solutions offered were not satisfactory to the poster, I am
sure many others here, including myself would of been more than happy to
offer some other alternatives. But why waste bandwidth and time when you
know people like you are just jumping at the bit to try and impress some
one.
---
Such being the case, your response was, and is, contradictory to your:
"But why waste bandwidth and time when you know people like you are
just jumping at the bit to try and impress some one."
BTW, it's "champing" at the bit.
what a waste of bandspace and storage!
---what a waste of bandspace and storage!
Another waste of bandspace.On Thu, 13 Oct 2011 20:02:46 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
what a waste of bandspace and storage!
---
So says the hypocrite loon who doesn't trim for relevance, but instead
responds to 504 words with 7.
---John Fields wrote:
On Thu, 13 Oct 2011 20:02:46 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
what a waste of bandspace and storage!
---
So says the hypocrite loon who doesn't trim for relevance, but instead
responds to 504 words with 7.
Another waste of bandspace.
Jamie
On Fri, 14 Oct 2011 18:03:05 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
John Fields wrote:
On Thu, 13 Oct 2011 20:02:46 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
what a waste of bandspace and storage!
---
So says the hypocrite loon who doesn't trim for relevance, but instead
responds to 504 words with 7.
Another waste of bandspace.
Jamie
---
Indeed.
Reducing 7 to 0 would be ideal.
Now you're catching on.
John Fields wrote:
On Fri, 14 Oct 2011 18:03:05 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
John Fields wrote:
On Thu, 13 Oct 2011 20:02:46 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:
what a waste of bandspace and storage!
---
So says the hypocrite loon who doesn't trim for relevance, but instead
responds to 504 words with 7.
Another waste of bandspace.
Jamie
---
Indeed.
Reducing 7 to 0 would be ideal.
Now you're catching on.