Hi i am presently trying to build a counter that counts freq upto 65536 Khz in less than 1 msec is this possible also has any one any ideas to where i should start thanks in advance for your help.
Paul
Hi i am presently trying to build a counter that counts freq upto 65536 Khz in less than 1 msec is this possible also has any one any ideas to where i should start thanks in advance for your help.
Paul
"Paul Taylor"
** You need a " period counter " - some frequency counters have this feature.Instead of totalling up completed cycles over 1 second, a very high frequency oscillator is gated *on* for one cycle ( or 10 or 100) to count microseconds and decimal divisions thereof.
If you get 15.259 uS - you are home and hosed.
....... Phil
Obviously enugh, a counter driven at 65536kHz - I presume you mean
65.536MHz - will accumulate 65536 counts in one millisecond.You will need a stable local oscillator to define your millisecond - traditionally divided down from a 10MHz crystal oscillator, but more precise solutions are available.
A 16-bit wide synchronous counter capable of running at 66MHz isn't entirely trivial. Just stringing together regular TTL or CMOS parts won't work, because the freely available 74F and 74ACT and similar synchronous counters aren't quite fast enough. Making the first stage of your counter out of a separately packaged JK-flip-flop might be enough to get you over the hump, but most of the recent programmalbe logic parts are fast enough and big enough t let you realise a suitable
16-bit synchronous counter in a single package.I would help if you told us more about what you are trying to do.
-- Bill Sloman, Nijmegen
sorry typo error 65536 (2 to the power of 16)
Phil are these regularly available any where?
Phil do you have any examples ect.... this sounds like the way i should go maybe?
"Paul Taylor"
** Top posting is both a usenet crime and an insult to others.STOP IT NOW !!!!!!!!!!!!
Plus:
EXPLAIN what the f*ck you ACTUALLY want and WHY !!
So far you are just like any other PITA troll.
......... Phil, grrrrrrrrrrr
** YOU are just BEGGING for it - Mr pommy arsehole.
Not JUST another EVIL top poster, but a f****it BLANK PAGE poster too.
Observe usenet etiquette - or GO DROP DEAD !!
........ Phil
Thanks for your kind remarks Phil i hope i have it right this time?
-- ----------------------------------------------------- Paul Taylor BSC (Hons)
** Wot a complete fool.
........ Phil
-- You assume you could...
-- Not yet. Try bottom posting and you\'ll be closer.
Phil im not a troll, i am interested in the period counter concept you said about i searched the web and cant seem to find much about it.
Thanks
by the way what is a troll?
-- Please bottom post. OK, so your high frequency is 65536Hz. What\'s your low frequency?
Oh Dear
martin
Thanks for that martin so im some bad furry creature......
Sorry john for top posting i think i have got to grips with this newsgroup business now my bottom limit is basically 1hz with a resolution of 1hz to. any of you guys now about period counters Phil was saying that this could be the way to go?
Thanks
No, you've got to get grips with your news reader. Simply move the cursor to the bottom of the original text before starting to type (after deleting irrelevant text). Simple.
Meindert
is this ok? i get help hopefully in the end for the problem i firsted posted for?
i think this is right thanks for all your help i have now mastered writing to a newsgroup
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