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Re: Slew rate and BW logic when designing differentietor of a pulse
Hello Andy , regarding the 200Ohm load,How did you? see that I am over loading the opamp?
Could you say what measurement needs to be done and where in the datasheet I need to look for this issue to see that I am not ruining the OPAMP?
Thanks.
https://www.analog.com/media/en/technical-documentation/data-sheets/ad8033_8034.pdf |
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OFF-TOPIC: Jeeps, shifting, and snow (was: Batteries)
wn4isx
On Tue, Mar 4, 2025 at 08:45 AM, Donald H Locker wrote:
until I clear out "all that stuff you've got here!In our case it was me who decided "Dear God I've got to downsize!" I had about 30X30X20 in the corner of a warehouse filled with 'stuff.'
I even had a WWII era jeep. That was a nightmare to license and transfer.
I'm down to a few photocopy boxes of stuff I have to do some serious thinking.
It might be worth the effort to sell on Ebay.?
I found stuff I had no idea I had or where it came from.
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The university used to have surplus property auctions the 3rd Thursday of most months and I'd visit afte the big boys took what they wanted and pick out some "gold". a brand new Bird termaline watt meter, a perfect Bird throughline VSWR meter, audio oscillators, radiation detectors out the ying yang. All sorts of goodies that I'll never use.
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There is a certain feeling of freedom getting rid of stuff you'll never use.
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Re: Batteries
On Tuesday 04 March 2025 09:08:34 am Bertho wrote:
For the ultimate lithium battery (cell) see:That's one heck of a temperature range, there... And a 40 year lifespan? Wow. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin |
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Re: Batteries
开云体育Andy, When that type of performance is needed, it is a custom design project and not for the general public. I do not expect the batteries will be replaced in my lifetime. When the equipment is mounted at a top of a pole and a bucket truck is required for service, and the road lane needs to be closed, the mechanical size/cost is not an significant issue. Regular rechargeable lithiums are also around 3.6V so no surprise. Amazing batteries! Bertho ? From: [email protected] <[email protected]> On Behalf Of Andy via groups.io
Sent: 4 March, 2025 10:27 To: [email protected] Subject: Re: [electronics101] Batteries ? On Tue, Mar 4, 2025 at 09:23 AM, Bertho wrote:
Darn!? All these alternate technologies!? With built-in ways to mess us up. ? Those Tadiran cells come in standard AA, C, and D form factors, but do NOT have the standard voltage.? Their nominal voltage in those form factors is 3.6V.? Now that's a million catastrophies just waiting to happen. ? THIS is the kind of thing that should never have happened.? Shame on them. ? Hopefully their very high cost will deter most people from using them in equipment designed to accept AA, C, or D dry cells. ? I also wonder why anyone would design equipment to accept 3.6V cells with AA, C, or D form factors.? Do traffic control equipment designers really do such a thing?? Or do they take the smart route and only use the alternate form factors? ? Andy ? |
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Re: IR digital cameras (was: Batteries)
wn4isx
Some Panasonic digital cameras are fairly easy to modify.
You remove the IR blocking filter from the CCD camera.
With this mod you'll get a mix of visible light and IR, I still had the IR passive lens from my childhood, I hang on to almost everything, spent the last 6 months getting rid of stuff.
Anyway there are two different IR passive filters, one is very deep red, the other appears black.
To use the "black" one requires the camera to be locked down on a tripod, you focus with the deep red, then change to the "black" filter and take your photo. Back then we used 100W incandescent bulbs on each side at roughly 45 degree angles.
Today you can see what the camera is seeing on the LCD screen, a heck of a lot easier.
I built an LED IR illuminator and I can mount the array using the quarter inch tripod mount.
I've built a 'gun' frame the camera is mounted on and the LED array is above the camera.
Looks like something from a cheap SF movie but it works pretty well.
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The built in xenon strobe produces very little IR. It's no big deal because I simply turn the flash off.
I have an IR blocking filter so I can mount it on the camera and use it for visible light but my wife has a ice Kodak digital camera we use for visible light and the camera on my cell phone is surprisingly good. It is 12 megapixals.
The big weakness with cell phone cameras isn't the CCD camera but the lens. Real cameras have sophisticated lens, multiple lens, each with a special diachromatic coating to reduce lens flare etc.
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My cell phone has a higher bit count then the Sony broadcast cameras we used at my last job.
Of course the lens for those cameras cost about 100k each.?
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I have the image intensifier lens from a 3nd generation night vision scope. it's an odd shape and I probably need to learn to print a plastic case. I'd love to interface a TV or still camera to the intensifier but optics gets complicated and really tricky.
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I have the output lens from a WWII sniper scope that used a "car" headlight with a gel IR filter to illuminate the scene. I had the entire sniper scope but the image converter tube went gassy after a decade or so.
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I need to come up with a lens to feed the image to the intensifier tube. This is probably a "I'd really like to make this work but I don't know enough." project. The tube is a reject because it has one more pixel defect then the specs allow.
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Given US regulations on such "high tech" stuff I can't go into any real details. Which is silly because a friend has a late model Russian night scope so clearly the secret is out there.
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""On the same note, it is a violation of ITAR to allow any non-U.S. citizen to look through U.S. Gen3 night vision equipment (even on US Soil). They are also not allowed to have access to any operator’s manuals or documentation, whatsoever, pertaining to US Gen 3 Night Vision Devices. This is a little-known fact about ITAR and Night Vision Devices, but it is true. We have confirmed this with the US State Department and major Night Vision Manufacturers. At TNVC, we take great care to ensure our clients are properly informed on laws and regulations pertaining to night vision. ""
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Re: Slew rate and BW logic when designing differentietor of a pulse
On Tue, Mar 4, 2025 at 06:50 AM, Michael Dunn wrote:
Agreed. ?
Be aware that you are also over-stressing the op-amp with the 200 ohm load.? That's 37.5 mA peak output, which it might not provide.? But I think that is unrelated to the question.
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Andy
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IR digital cameras (was: Batteries)
On Tue, Mar 4, 2025 at 08:37 AM, wn4isx wrote:
I wonder if that's true of all of them.? It probably is.? Photons are photons.? I know my first digital almost-SLR from 20+ years ago could, and I considered having the modification done to it.? I love IR photography, but never experimented with it.? I'm afraid it might become a "fad" that loses its appeal after a few hundred IR photos. Can't you just use the built-in flash? ?
Or did the camera's modification add an IR-only filter to the lens, making it insensitive to visible light?
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Andy
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Re: Batteries
On Tue, Mar 4, 2025 at 09:23 AM, Bertho wrote:
Darn!? All these alternate technologies!? With built-in ways to mess us up.
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Those Tadiran cells come in standard AA, C, and D form factors, but do NOT have the standard voltage.? Their nominal voltage in those form factors is 3.6V.? Now that's a million catastrophies just waiting to happen.
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THIS is the kind of thing that should never have happened.? Shame on them.
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Hopefully their very high cost will deter most people from using them in equipment designed to accept AA, C, or D dry cells.
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I also wonder why anyone would design equipment to accept 3.6V cells with AA, C, or D form factors.? Do traffic control equipment designers really do such a thing?? Or do they take the smart route and only use the alternate form factors?
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Andy
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Re: Batteries
开云体育For the ultimate lithium battery (cell) see: ? The Tadarian battery operating temperature is -80°C to +125°C and 40 year life. We are using a D-cell in traffic control equipment. They cost an arm and a leg…. Bertho |
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Re: Batteries
开云体育Well, that is far more response than I expected! Many thanks. (My spouse won't let me bring any more technology bits into the house until I clear out "all that stuff you've got here!") Donald. On 3/4/25 08:37, wn4isx via groups.io
wrote:
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Re: Batteries
wn4isx
I've ordered a set of 4 AA cells to see how they work.
Now these cells clearly have a circuit for charging and to step the 3.6ishV down to 1.5V.
IF they perform as advertised, they would be an extremely good value. I'll run some tests, voltage drop in a 4 cell incandescent flashlight versus time, charge them, leave them in the freezer and repeat the test. We seldom have temperatures below zero more often then once or twice a winter, but when we do, many cells / batteries roll over and play dead until they warm up.
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I have an older Panasonic digital camera that eats cells, it takes two AAs and you get about 50 photos with high quality alkaline. It will be interesting to see how these cells work in this camera.?
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I only keep the camera because we were able to remove the IR blocking filter and the camera takes very high quality IR photos. I fell in love with IR when I was 8 and Dad bought a roll of Kodak IR film to photograph some trees on land our family owns in Eastern KY. Trees with health problems can "scream" at you in IR (or BW with a deep red filter).
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We ended up cutting down about 50 diseased trees. I was too young to understand what was wrong.
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Normal digital cameras are moderately sensitive to IR, you can check an IR remote control with a camera phone, but they include IR blocking filters that knock down at least 90% of the near IR and all of the deeper IR, remove the filter and it's an entire new world, if you have an IR pass filter.
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The camera has a xenon flash that produces near zero IR. I have to illuminate an object with an array of IR LEDs.
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Re: Batteries
开云体育Sorry for the ambiguity of the question - I was speaking of
secondary cells, like?
offers. Donald. On 3/3/25 13:35, Andy via groups.io
wrote:
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Re: Batteries
wn4isx
On Mon, Mar 3, 2025 at 01:35 PM, Andy wrote:
There were no electronic components in either the AA or 9 V. I've already taken them to the electronic recycle center or I'd post photos. ?
It's been too many years since university, but, I may well have only heard Laclanche in the chemistry class and not EE classes. I can't say we studied cells/battery chemistry in any detail other then lead acid and NiCad-AgCad, the later two only for the specific use conditions that produce the memory effect.
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I have all my notes from university (please don't ask me why because I have no idea) and I've pulled the photocopy box with those notes, I'll go through them tomorrow before shredding them. I'm not sure I've ever heard anyone but a chemist refer to carbon-zinc as Laclanche. In a way I regret starting this part of the thread because it's created needless confusion. Unless one is taking a university chemistry of batteries, or a class on the history of batteries, I doubt anyone would hear or read the word Laclanche. I've created needless confusion. Just accept that "yes a carbon-zinc is a Laclanche, the chemistry has been improved, and today's carbon-zinc bears little resemblance to the laboratory prototype Mr. Laclanche invented. The liquid electrolyte was replaced with a damp mess of magnesium dioxide." I suspect chemists have found adding trace amounts of various chemicals has improved both the life, lowered the internal resistance, and changed the no load open circuit. I have no way of verifying the last sentence but it makes sense to me.
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However I am 100% certain there is no step down regulator on Everready primary 1.5V / 9V cells / batteries.
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I am interested in the statement in the everready PDF about protection against over current situations.
I expected to find a small thermal cutout, there wasn't one. I'm guessing the chemistry and construction limit the maximum current.
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I bet a primary lithium AA wouldn't heat a glow plug. I'll have to measure the maximum current I can draw from a lithium AA. |
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Slew rate and BW logic when designing differentietor of a pulse
Hello , I have designed a differentiator as shown below.The pulse in the simulation photos links below is 1ns which is 350MHz BW ,much higher then the BW of the AD8034 opamp.As you can see its working.How its possible? Why its differentiating the pulse although the opamp? doesnt have such BW? Given the pulse what slew rate and what BW does the OPAMP need to have? https://eu.mouser.com/datasheet/2/609/AD8033_8034-1502231.pdf https://ibb.co/0VMSYCkQ https://ibb.co/tMkTLQt6 https://ibb.co/WpDF9Qch |
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Re: Batteries
wn4isx
On Mon, Mar 3, 2025 at 01:21 PM, Bertho wrote:
I think they they added a resistor with a diode wired backwards to the main diode that diode provided V+ They specified a 10% reverse charge
Say you charge at 100mA, then you'd want to add a reverse charge of 10ma.
They fed raw AC to the diodes from a transformer. The entire circuit looked rather cheap and poorly thought out to me.
I'm going from memory here as?I never built the circuit, struck me as a waste of time as I had NiCads and lead acid.
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Re: Batteries
wn4isx
Wiki has an interesting article on lithium batteries, the data is somewhat at odds with the information in the book. Lithium cells/batteries is an extremely complex subject with a lot of what appear to be contradictions.
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I found this interesting...I had to sign for the primary lithiums I purchased at Wal-Mart at the first of the year. I guess I exceeded their non druggy user policy. It's as bad as when you need pseudoephedrine decongestant. In Kentucky there is a government tracking program, CASPER, that monitors /records what controlled substances you purchase. Given how oxy whatever is a plague in Eastern Kentucky I guess I see the need. I had no idea you could use primary lithium cells for some pretty evil purposes...?
Methamphetamine labs[]Unused lithium batteries provide a convenient source of lithium metal for use as a??in??labs. Specifically, lithium metal reduces??and??to??in the??method, which employs solutions of alkali metals dissolved in anhydrous?. Some jurisdictions have passed laws to restrict lithium battery sales or asked businesses to make voluntary restrictions in an attempt to help curb the creation of?. In 2004??stores were reported to limit the sale of disposable lithium batteries to three packages in Missouri and .... -------------------------------------------------------------- The book I referenced earlier in this thread is extremely useful. Batteries in a Portable World - A Handbook on Rechargeable - Isidor Buchmann - 4, 2017 ? |
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Re: Batteries
On Mon, Mar 3, 2025 at 01:38 PM, Roy J. Tellason, Sr. wrote:
... I just recently did a battery swap, and found out that one place that used to carry Exide exclusively was carrying an assortment of brands, including some that were Korean. But not chinese.Just to be clear about this - ?
I wasn't talking about Chinese brands.? I was referring to American battery brands, with off-shore manufacturing.
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I first heard the story at a ham radio convention, from someone speaking of first-hand experience.? There was about a 20% weight reduction from one year to the next.? I'm sure it affected the battery's capabilities.? Later, I read confirmation from a couple of written references.? They all were sold by "trusted" American battery makers.? Yes, it was hearsay and might be part of the general fear of cheap Chinese imports, but who knows?
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Andy
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Re: Batteries
On Monday 03 March 2025 01:17:58 pm Andy via groups.io wrote:
On Sun, Mar 2, 2025 at 02:18 PM, Roy J. Tellason, Sr. wrote:Yeah. But the last ones I bought weren't anywhere near that expensive, maybe about $2 a battery?Now by "lithium" - do you mean the NON-rechargeable, super-long-life lithium 1.5 V cells?? The ones that cost $20 for a pack of four AA's? I use those for the outside thermometer so it won't freeze, but I reserve it for that only because they cost so much.I use them in my camera. If I'm not mistaken, they are guaranteed to have at least 10 or 15 years of shelf life.I haven't seen that on anything I own here, but those are usually a different form factor anyway, like the 18650s I got out of some laptop battery packs. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin |
Bertho
Michael Dunn
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