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Message |
Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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 Posted: Mon Jul 17, 2006 11:10 am Post subject:
FREQ COUNTER help
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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 |
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Phil Allison
electronics forum Guru
Joined: 20 May 2005
Posts: 1368
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| Posted: Mon Jul 17, 2006 12:05 pm Post subject:
Re: FREQ COUNTER help
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"Paul Taylor"
| Quote: |
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.
|
** 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 |
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Bill Sloman
electronics forum Guru
Joined: 12 May 2005
Posts: 1080
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| Posted: Mon Jul 17, 2006 12:24 pm Post subject:
Re: FREQ COUNTER help
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Paul Taylor wrote:
| Quote: | 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.
|
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 |
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 12:33 pm Post subject:
Re: FREQ COUNTER help
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sorry typo error 65536 (2 to the power of 16)
<bill.sloman@ieee.org> wrote in message
news:1153139085.236239.262300@35g2000cwc.googlegroups.com...
| Quote: |
Paul Taylor wrote:
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.
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
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 12:42 pm Post subject:
Re: FREQ COUNTER help
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Phil are these regularly available any where?
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:4i1cngF1213cU1@individual.net...
| Quote: |
"Paul Taylor"
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.
** 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
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 12:55 pm Post subject:
Re: FREQ COUNTER help
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Phil do you have any examples ect.... this sounds like the way i should go
maybe? |
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Phil Allison
electronics forum Guru
Joined: 20 May 2005
Posts: 1368
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| Posted: Mon Jul 17, 2006 1:02 pm Post subject:
Re: FREQ COUNTER help
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"Paul Taylor"
| Quote: | Phil are these regularly available any where?
|
** Top posting is both a usenet crime and an insult to others.
STOP IT NOW !!!!!!!!!!!!
Plus:
EXPLAIN what the f*** you ACTUALLY want and WHY !!
So far you are just like any other PITA troll.
.......... Phil, grrrrrrrrrrr
| Quote: |
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:4i1cngF1213cU1@individual.net...
"Paul Taylor"
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.
** 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
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Phil Allison
electronics forum Guru
Joined: 20 May 2005
Posts: 1368
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| Posted: Mon Jul 17, 2006 1:06 pm Post subject:
Re: FREQ COUNTER help
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"Paul Taylor" <paul.taylor@uea.ac.uk> wrote in message
news:e9g1bm$arm$1@cpca14.uea.ac.uk...
| Quote: | Phil do you have any examples act.... this sounds like the way I should go
maybe?
|
** YOU are just BEGGING for it - Mr pommy arsehole.
Not JUST another EVIL top poster, but a fuckwit BLANK PAGE poster too.
Observe usenet etiquette - or GO DROP DEAD !!
......... Phil |
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 1:16 pm Post subject:
Re: FREQ COUNTER help
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Thanks for your kind remarks Phil i hope i have it right this time?
"Paul Taylor" <paul.taylor@uea.ac.uk> wrote in message
news:e9fr83$7ol$1@cpca14.uea.ac.uk...
| Quote: | 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
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 1:16 pm Post subject:
Re: FREQ COUNTER help
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--
-----------------------------------------------------
Paul Taylor BSC (Hons)
Electronics Technician
School of Environmental Science
University of East Anglia
Norwich
NR4 7TJ
Phone: +44 (0)1603 592502
Fax: +44 (0)1603 591327
Email: Paul.Taylor@uea.ac.uk
Web: http://www.uea.ac.uk/~e087
------------------------------------------------------
"Paul Taylor" <paul.taylor@uea.ac.uk> wrote in message
news:e9fr83$7ol$1@cpca14.uea.ac.uk...
| Quote: | Hi i am presently trying to build a counter that counts freq upto 65536
Khz in less than 1 msec is this possible also has any one any ideas to
where i should start thanks in advance for your help.
Paul
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Phil Allison
electronics forum Guru
Joined: 20 May 2005
Posts: 1368
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| Posted: Mon Jul 17, 2006 1:37 pm Post subject:
f*** Off - TROLL
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"Paul Taylor" <paul.taylor@uea.ac.uk> wrote in message
news:e9g2ja$bsc$1@cpca14.uea.ac.uk...
| Quote: | Thanks for your kind remarks Phil i hope i have it right this time?
|
** Right up you stupid fucking arse - you smug, autistic pommy pig.
........ Phil |
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Phil Allison
electronics forum Guru
Joined: 20 May 2005
Posts: 1368
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| Posted: Mon Jul 17, 2006 1:37 pm Post subject:
Re: FREQ COUNTER help
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"Paul Taylor" <paul.taylor@uea.ac.uk> wrote in message
news:e9g2jq$aas$1@cpca14.uea.ac.uk...
| Quote: | -----------------------------------------------------
Paul Taylor BSC (Hons)
Electronics Technician
School of Environmental Science
University of East Anglia
Norwich
NR4 7TJ
Phone: +44 (0)1603 592502
Fax: +44 (0)1603 591327
Email: Paul.Taylor@uea.ac.uk
Web: http://www.uea.ac.uk/~e087
|
** Wot a complete fool.
......... Phil |
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John Fields
electronics forum Guru
Joined: 24 Mar 2005
Posts: 3260
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| Posted: Mon Jul 17, 2006 1:43 pm Post subject:
Re: FREQ COUNTER help
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On 17 Jul 2006 05:24:45 -0700, bill.sloman@ieee.org wrote:
| Quote: | I would help if you told us more about what you are trying to do.
|
---
You assume you could...
--
John Fields
Professional Circuit Designer |
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John Fields
electronics forum Guru
Joined: 24 Mar 2005
Posts: 3260
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| Posted: Mon Jul 17, 2006 1:48 pm Post subject:
Re: FREQ COUNTER help
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On Mon, 17 Jul 2006 14:16:25 +0100, "Paul Taylor"
<paul.taylor@uea.ac.uk> wrote:
| Quote: | Thanks for your kind remarks Phil i hope i have it right this time?
|
---
Not yet.
Try bottom posting and you'll be closer.
--
John Fields
Professional Circuit Designer |
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Paul Taylor
electronics forum beginner
Joined: 10 Feb 2005
Posts: 45
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| Posted: Mon Jul 17, 2006 1:48 pm Post subject:
Re: FREQ COUNTER help
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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? |
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