pulse genetator
pulse genetator
(OP)
i am looking for a device that will generates 24v pulses of duration 5ms at a frequency of around 0.8HZ can anyone help i have looked at some of the small modular plcs but the timers are not short enough
if the duration and frequency could be linked to a pot all the better
thanks
rich
if the duration and frequency could be linked to a pot all the better
thanks
rich





RE: pulse genetator
Gunnar Englund
www.gke.org
RE: pulse genetator
RE: pulse genetator
RE: pulse genetator
I have used them maybe 20 times. I think the average is they take 4 times longer to get working the way you want them then you'd ever expect. And about 1 out of 4 times you flat can't get them to do the job.
On the brighter side they have newer ones that don't short the totempole and sink 20 times more than the original. Go for the CMOS versions. Look to Intersil. Ah yes, now I see BrianR has already pointed out this nifty fact...
RE: pulse genetator
Everyone knows about the problems with bipolar 555s - and we have known about that for at least thirty years. So why keep on moaning about it? It is the 21st centuty after all...
This is a good application for a 555 - and I do not say CMOS - that is kind of understood.
Gunnar Englund
www.gke.org
RE: pulse genetator
RE: pulse genetator
I'll add a vote for the TL494/594's and SG38xx's...
Seems that every proto I have built with one of these types
has worked first time, every time. Can't say that for the
555's - built a LOT of them that needed patching to be
stable of buffered (and a lot of them that worked right
off the bat ).
That being said, I think any RC-based timer needs a divider
if one goes much over a 500 mSec period.
There are some examples using all the above types from
40 nSecs to hours at:
h
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