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#1
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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 | | | Voice480)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. |
#2
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#3
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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 | | | Voice480)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 |
#4
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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. |
#5
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#6
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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. |
#7
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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? |
#8
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#9
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#10
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 | | | Voice480)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 |
#11
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 | | | Voice480)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 |
#12
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#13
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 | | | Voice480)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 |
#14
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#15
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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Pulse Stretcher
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 "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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEcBAEBAgAGBQJNeOvNAAoJEJXfKw5kUPt7o8gH/1n0Fa7FLoACjUhpMP3ox8Ko 355UKPbNnF5vkyojl6r+N/A9kniw60sp6t2Lo1AYVJ0vlLff7ZUJtsh5PlnUD1y2 /hegz94 m II LEARNS A LESSON - LYING ABOUT OTHERS N4pmg94mglzY dmUEROzn3BcU48ZL9IlvLjqT2l6T89Z6+UHQGn37+wuIRFDXDS B/rQHJNBJvNQBn zDPpru6m8lGnhahGG9Uud/gGE3A65Sry7Uk5qObpubObq+HR9VXIgVpmP4TtHFsK gjfla8MKe90HbI3DmGB3pNJsTFHV0Gw13E6OFjgaM40wMCPOmw 5G1b3KKf1PYK0= =dYmZ -----END PGP SIGNATURE----- |
#16
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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 |
#17
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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 |
#18
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
#19
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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 | | | Voice480)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 |
#20
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad
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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 |
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