Pulse Stretcher
 

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Pulse Stretcher
 

"Jim Thompson" wrote
in message ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson


How accurate?

Wow, Fairchild has the 4538 as obsolete. bummer.
I've used the 4040 counter in the past to generate long pulse times. Fed
by a slow running 555.
Just what you wanted to hear ;)

Cheers

Pulse Stretcher
 

On Thu, 10 Mar 2011 21:25:04 -0500, "Martin Riddle"
wrote:



"Jim Thompson" wrote
in message ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson


How accurate?

Wow, Fairchild has the 4538 as obsolete. bummer.
I've used the 4040 counter in the past to generate long pulse times. Fed
by a slow running 555.
Just what you wanted to hear ;)

Cheers



Sloppy. I can tune a fairly accurate master oscillator with a pot.

I'm leery of RC due to leakage.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Remember: Once you go over the hill, you pick up speed

Pulse Stretcher
 

Jim Thompson wrote:
On Thu, 10 Mar 2011 21:25:04 -0500, "Martin Riddle"
wrote:


"Jim Thompson" wrote
in message ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

How accurate?

Wow, Fairchild has the 4538 as obsolete. bummer.
I've used the 4040 counter in the past to generate long pulse times. Fed
by a slow running 555.
Just what you wanted to hear ;)

Cheers



Sloppy. I can tune a fairly accurate master oscillator with a pot.

I'm leery of RC due to leakage.

...Jim Thompson

A low-pin-count microcontroller makes a dandy delay element, depending
on the frequency
of the master clock. If you have other slow functions that can be
dumped into it also, it can be cost/space effective.

Pulse Stretcher
 

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

Use an up/down counter (7490?), count up fast during the pulse, count
down slow afterward.

Or use a micro to do the same thing (if you're not making custom
silicon). Is a SOT-23 package too big?
http://ww1.microchip.com/downloads/e...Doc/41239D.pdf

--
http://www.wescottdesign.com

Pulse Stretcher
 

In article ,
Jim Thompson writes:
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

You didn't say much about your environment. If you are building
a board rather than a chip, long delays are simple in software.

Assuming you want to use a counter...

Make a counter that is big enough. Load it with a magic number.
After N cycles, it will overflow. Add glue around the edges to
make it do what you want.

Suppose you have an active low load signal. Wire that to the pulse-out FF.
Set the pulse-out with the pulse-in. Use the carry-out the top to reset
the pulse-out FF. It will sit there reloading itself until you poke it
again.


--
These are my opinions, not necessarily my employer's. I hate spam.

Pulse Stretcher
 

Jim Thompson wrote:
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson
Maybe one of those single ripple counter ICs available (now) or
umpteen years?

Pulse Stretcher
 

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson
n
____|____
/ \
| . . . |
+-+-------+-+
CLK---------------| |
+----+ | DIV n |
IN------|S Q|-+--|E TC|-+
| | | +-----------+ |
+-|R | | |
| +----+ +---OUT |
+-------------------------+

---
JF

Pulse Stretcher
 

"Jim Thompson" wrote in
message ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson


I believe that one of the new Linear Tech parts in the 'timerblox' family
will do this. The one shot version goes 1uS to 34 Seconds with one resistor
change. Your choice of triggering options.
www.linear.com/products/timerblox
http://cds.linear.com/docs/LT%20Maga...ndy_Crofts.pdf

Oppie

Pulse Stretcher
 

On Fri, 11 Mar 2011 07:23:45 -0600, John Fields
wrote:

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson
n
____|____
/ \
| . . . |
+-+-------+-+
CLK---------------| |
+----+ | DIV n |
IN------|S Q|-+--|E TC|-+
| | | +-----------+ |
+-|R | | |
| +----+ +---OUT |
+-------------------------+

---
JF

Thanks, John F !!!

I knew it was simple. I was just having a brain freeze :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Remember: Once you go over the hill, you pick up speed

Pulse Stretcher
 

"Jim Thompson" schreef
in bericht ...
I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Well, the basic idea is to use the pulse to be streched to set a flipflop
(asynchronously) and to start the counter. When the counter overflows it
resets the flipflop and stops the counting until the next pulse appears.

petrus bitbyter

Pulse Stretcher
 

Jim Thompson wrote:

I need a 10 SECOND pulse stretcher!

Isn't a "pulse stretcher" the thing that the paramedics use to put the
injured pulse onto the ambulance?

Thanks,
Rich

Pulse Stretcher
 

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Remember: Once you go over the hill, you pick up speed

Pulse Stretcher
 

"Jim Thompson" wrote in message
...
On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson

Ahh! That clears that up. I wasn't sure if you wanted to build
a pulse stretcher in 10 seconds, stretch a pulse to 10 seconds,
or stretch a 10 second pulse to something even longer. ;-)
Art

Pulse Stretcher
 

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"Jim Thompson" wrote in message
...
In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson



All this time I thought a 555 was an analogue circuit.

mike


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Pulse Stretcher
 

On Fri, 11 Mar 2011 18:57:46 -0700, Jim Thompson
wrote:

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson
---
Excellent choice, and having the *******s grit their teeth makes it
even better! ;)

---
JF

Pulse Stretcher
 

On Sat, 12 Mar 2011 06:15:24 -0600, John Fields
wrote:

On Fri, 11 Mar 2011 18:57:46 -0700, Jim Thompson
wrote:

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson
---
Excellent choice, and having the *******s grit their teeth makes it
even better! ;)

---
JF

555, hilarious! Sounds like digital scared him off again.

John

Pulse Stretcher
 

On Sat, 12 Mar 2011 08:36:58 -0800, John Larkin
wrote:

On Sat, 12 Mar 2011 06:15:24 -0600, John Fields
wrote:

On Fri, 11 Mar 2011 18:57:46 -0700, Jim Thompson
wrote:

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson
---
Excellent choice, and having the *******s grit their teeth makes it
even better! ;)

---
JF

555, hilarious! Sounds like digital scared him off again.
John

---
To me it sounds like: "smaller, faster, better, cheaper." won.

I noticed no solutions of any kind from you, bigmouth, so I don't
think you have room to talk.

---
JF

Pulse Stretcher
 

On Sat, 12 Mar 2011 12:03:36 -0600, John Fields
wrote:

On Sat, 12 Mar 2011 08:36:58 -0800, John Larkin
wrote:

On Sat, 12 Mar 2011 06:15:24 -0600, John Fields
wrote:

On Fri, 11 Mar 2011 18:57:46 -0700, Jim Thompson
wrote:

On Thu, 10 Mar 2011 19:05:51 -0700, Jim Thompson
wrote:

I need a 10 SECOND pulse stretcher!

I vaguely recall doing that using a counter, but can't recall the
details.

...Jim Thompson

In spite of my analog background I like the precision and stability of
digital, but I've fallen back to complete simplicity, a single 555
Timer... that ought to make Slowman and Jerkin happy ;-)

(I found some high quality 2.2uF film capacitors in my junk :-)

...Jim Thompson
---
Excellent choice, and having the *******s grit their teeth makes it
even better! ;)

---
JF

555, hilarious! Sounds like digital scared him off again.
John

---
To me it sounds like: "smaller, faster, better, cheaper." won.

Yep. Digital was elegant, but required a clock (555 :-) and a counter
chip and some gating. As a pure stretcher, all you need is the 555.
The only thing pushing me to digital was that I didn't know I had some
high value, high quality capacitors on-hand. Once I discovered those
it was no contest.


I noticed no solutions of any kind from you, bigmouth, so I don't
think you have room to talk.

---
JF

Jerkin's "suggestions" would be laughable (as usual), thus his
reticence :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Remember: Once you go over the hill, you pick up speed

Pulse Stretcher
 

John Fields wrote:
On Fri, 11 Mar 2011 18:57:46 -0700, Jim Thompson

(I found some high quality 2.2uF film capacitors in my junk :-)

Excellent choice, and having the *******s grit their teeth makes it
even better! ;)

I would have suggested a polyester or polypropylene cap and a CMOS
555, but I'd rather see JT stew in his own juices, just because he's
such an asshole. No, scratch that - calling the likes of him an asshole
is an insult to the human anus.

I guess I'm just a bad boy. :-

Cheers!
Rich