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Dave <theschemer@...> added the photo album Lorex Wifi Camera : An image of the circuit board of my Lorex Wifi security camera that has lost it's effective range. The following photos have been uploaded to the Lorex Wifi Camera photo album of the electronics101@groups.io group. By: Dave <theschemer@...> |
Re: Wireless Camera repair
On Sat, Mar 1, 2025 at 02:27 PM, Dave wrote:
I'd be concerned about the word "outdoor" in that sentence.
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Being exposed to the elements opens up at least a few cans of worms.? Including corrosion.? Or frozen (compromised) components.? Some of that you might not be able to easily see.
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Andy
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Re: Wireless Camera repair
I just realized that the problem is likely just the wifi card that the antenna connects to. Problem is that it's likely proprietary and? not obtainable.
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On 3/2/2025 10:41 PM, wn4isx via groups.io wrote:
Is the screw on connector mounted on the PCB or is there a jumper? |
Re: Wireless Camera repair
I just opened it up with a Phillips head screwdriver and all the connections look ok. The antenna connection is on the frame or housing of the camera and looks in fine shape. It travels through the adjustable angle connector and into the main housing. It's all SMT in there but after a quick look I see no issues and the wire from the antenna connects the same way a wifi card in a laptop does and it looks fine. I may look at it at a later date under the microscope but the way its assembled even if I did find and replace a bad SMD component (and they are really small) it would be a real pain to re-assemble it and probably wouldn't work anyway. I will post a pic if the circuit board just so you can see what I have.
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Thanks On 3/2/2025 10:41 PM, wn4isx via groups.io wrote:
Is the screw on connector mounted on the PCB or is there a jumper? |
Re: Batteries
开云体育Question about the Lithium AA cells - I know they use a little buck regulator to get the voltage down to 1.5V (nominal) but that also means that they are current-limited. Finding out the current limit on the advertised products it "deucedly" difficult. Have you ever tried the glow plug test on a Li AA cell? Many TIA, On 3/2/25 14:37, Roy J. Tellason, Sr.
via groups.io wrote:
On Sunday 02 March 2025 01:49:59 am Andy via groups.io wrote:On Sat, Mar 1, 2025 at 01:30 PM, wn4isx wrote:****The "less likely to leak" has become a joke, all the major brands now leak long before their use by date. **** [snip] The YT channel "Project Farm" does all sorts of comparison tests on a lot of stuff, and he did one video comparing different brands, some of which I'd never heard of. He arrived at the conclusion that lithium was the way to go, that they didn't leak, and offered better performance than any of the alkaline cells that were out there. |
Re: Wireless Camera repair
wn4isx
Is the screw on connector mounted on the PCB or is there a jumper?
Most cameras I've worked with have a short, 5" or so, jumper with a press on RF connector on the PCB.
A few have the SMA directly on the BCB and the center connector can come unsoldered or the trace to it break. The break can be so microscopic it might be impossible to see, ohm out with a meter on low ohms, I'd use the diode measurement function.
Good luck. These things can drive a man to distraction.
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Re: Wireless Camera repair
开云体育I will see if I can get into the camera and post pics of what I find or see inside. I probably have the correct tools to get into it as I have some gun tool kits that have an assortment of bits along with other large plastic box kits with various bits. I think I already mentioned I tried a new antenna and this camera uses a screw on type like a coax cable. I will post back when I know more. Thanks On 3/1/2025 2:39 PM, wn4isx via
groups.io wrote:
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Re: Batteries
On Sunday 02 March 2025 01:49:59 am Andy via groups.io wrote:
On Sat, Mar 1, 2025 at 01:30 PM, wn4isx wrote:That may be changing, we'll see.If rumors are to be believed (I know, there's a major problem with that), then some brands are considerably better than others in this respect. I went through a period where I tried all sorts of brands. Dollar store brands, etc. And I arrive at the conclusion that the name brands like Duracell and Eveready would last longer than any of those other ones. Yeah, you can get a whole big honkin' box of those other ones fairly cheaply, but who wants to be bothered with changing them more often? I used to favor Duracell, but they had a period of time where they seemed to be more prone to leakage. These days if you look at the battery rack in the front of a Wal-Mart near the registers, it's pretty much more Eveready than anything else. OTOH, I have a couple of Duracell D size that I pulled out of a magliite flashlight after realizing that they'd been in there close to a decade and a half, There's a date of "MAR 2013" on them And they still test good! The YT channel "Project Farm" does all sorts of comparison tests on a lot of stuff, and he did one video comparing different brands, some of which I'd never heard of. He arrived at the conclusion that lithium was the way to go, that they didn't leak, and offered better performance than any of the alkaline cells that were out there. One time when I was still in high school I picked up a "glow plug" at a hobby shop, the sort of thing you'd use for a model airplane engine. And just for the heck of it I connected it up to a AA alkaline cell, and sure enough that little heating element glowed. So I got curious and measured the current. I was really surprised to see that it was over an amp! I had no idea that you could pull that much out of one of those.... -- 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 |
Re: Batteries
On Sunday 02 March 2025 01:29:11 am Andy via groups.io wrote:
On Fri, Feb 28, 2025 at 04:03 PM, Roy J. Tellason, Sr. wrote:You don't need to cut anything open. Just grab one corner of the sheet metal where it joins with a pair of needle nosed pliers, and twist. Keep going like that and eventually you peel all of the metal off. Early 9V batteries had six smallish rectangular cells stacked, but the current alkaline ones have six AAAA cells standing up.The only place I've ever seen AAAA being used was in laser pointers. AndMy wife has something that uses one.? I think it goes with her tablet.? From about 5 years ago. I don't have anything around here that uses them. Some stuff here uses AAA, which is annoying enough. Going from AAA to AA you get almost 3 times the power out of it... -- 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 |
Re: Wireless Camera repair
On Saturday 01 March 2025 03:39:00 pm wn4isx via groups.io wrote:
If you can open the case, many security devices use "odd" screws, you might find the antenna connector popped loose. Most of these connectors are press fit and not 'real' microwave cables.Harbor Freight has a set of bits like that too. They've pretty much covered my needs when I encounter some of that weird stuff. I try not to do business with amazon to the extent possible. :-) -- 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 |
Re: Batteries
开云体育One more battery detail: Pagers (beepers) used N-cells and later AA-cels.? Mercury cells were popular with the much longer life. I collected dead cells and recovered the mercury that I then refined. Designing the RF and IF sections was not easy.? From the single cell, there was a linear regulator so only 0.975V was available at a couple of mA. Bertho |
Re: Batteries
wn4isx
On Sun, Mar 2, 2025 at 10:48 AM, wn4isx wrote:
I wrote:
They started out dry but the electrolyte was replaced with magnesium dioxide and they became 'dry.' That should have been?
They started out wet but the electrolyte was replaced with magnesium dioxide and they became 'dry.'
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I'm still on codeine cough syrup and it sure shows. Glad I don't have to drive anywhere today. |
Re: Batteries
wn4isx
Nobody but engineers and chemists called them by their proper name.
Leclanché cells were the first practical "dry cell." They started out dry but the electrolyte was replaced with magnesium dioxide and they became 'dry.' [damp really] Of course "as deployed" they were quite different from the original and featured additions/modifications by several people.
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https://www.sciencedirect.com/topics/engineering/zinc-carbon-battery
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I took a class in the "physics of electrical cells" in 'university' and learned the proper name.
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Most of us called them carbon-zinc batteries being ignorant that a battery is a collection of cells.
I cringe when I hear people call a "D" cell a battery.
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You can actually recharge carbon-zinc/Leclanché cells. They don't recharge all that well, the only place I could see the process being worthwhile was for a night watchman, use one set and recharge the other.
Going from a vague memory, each recharge lost about 5% of capacity. Typically recharging ended when the process ate through the zinc shell.
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There was a long series of letters to the editor in one of the magazines about how to improve charging.
One thing that appeared to have helped was to have about 10% reverse charge during the process.
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Everready [or one of the battery companies] actually sold a commercial charger.
I don't think you can recharge alkaline cells at all. even charging the carbon-zinc was a loss leader.
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The university class was interesting because it helped me understand "Primary batteries are burning metal to produce electricity." Not exactly accurate but it gets the idea across. We visited Oak Ridge and saw a liquid sodium battery. Good energy to weight ratio but molten sodium is pretty energetic if there is a leak.
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At the time, silver-cadmium had the best, as in highest energy to weight ratio, they were prone to memory just like nickle-cadmium but handled temperature extremes better. Of course they were somewhere so far beyond obscene expensive only the military and NASA could use them. The US Navy OSCAR series used them. The Nike' Zeus missile defense missiles would have also used them.?
[Been to one Nike' Zeus as they demolished it. Interesting site.]?
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Note: The Navy OSCAR and amateur Oscar only share names and have nothing else but being satellites in common.
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Re: Batteries
开云体育It appears to me that the alkaline batteries have gotten worse.? Presumably thinner shell to save money and increased performance. It also appears that the free carbon-zinc batteries from China leak less.? They do not push the life/performance issue. Regardless, I have switched to rechargeable Enelope cells.? I have not had a leak yet after many years. Bertho ? From: electronics101@groups.io <electronics101@groups.io> On Behalf Of Andy via groups.io
Sent: 2 March, 2025 1:50 To: electronics101@groups.io Subject: Re: [electronics101] Batteries ? On Sat, Mar 1, 2025 at 01:30 PM, wn4isx wrote:
If rumors are to be believed (I know, there's a major problem with that), then some brands are considerably better than others in this respect. ? I have been warned never to buy name-brand "X" because they almost always leak, whereas name-brand "Y" rarely does.? I have heard that said by several people, which suggests there is some truth to it. ? At the same time, though, I would expect that it is a "moving target", and what was the best advice 5 or 10 years ago, is probably meaningless today, as the name brands frequently change their suppliers. ? It used to be simpler when we knew things were manufactured domestically by the company with the name on the box, by?the same factories and people over long periods of time.? But I digress. ? Andy ? |
Re: Batteries
On Sat, Mar 1, 2025 at 01:30 PM, wn4isx wrote:
If rumors are to be believed (I know, there's a major problem with that), then some brands are considerably better than others in this respect.
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I have been warned never to buy name-brand "X" because they almost always leak, whereas name-brand "Y" rarely does.? I have heard that said by several people, which suggests there is some truth to it.
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At the same time, though, I would expect that it is a "moving target", and what was the best advice 5 or 10 years ago, is probably meaningless today, as the name brands frequently change their suppliers.
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It used to be simpler when we knew things were manufactured domestically by the company with the name on the box, by?the same factories and people over long periods of time.? But I digress.
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Andy
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Re: Batteries
I've heard of "wet cells" versus "dry cells".? That Wikipedia article suggests that Leclanche cells would be called "wet cells" and were not the same as the normal "dry cells" that were commonly available in the USA before Alkalines.? It seems as if Leclanche cells petered out from common usage (in the USA) decades before Alkalines arrived and took over.
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Andy
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Re: Batteries
On Sat, Mar 1, 2025 at 01:30 PM, wn4isx wrote:
Really?? So what you're saying is that all the carbon/zinc batteries that everyone around here (USA) used for decades before Alkalines came out, were actually Leclanche cells.? Then why didn't they - why didn't ANYONE - ever call them that? ?
Was it strictly an eastern Kentucky thing where they were called Leclanche?
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That's odd, the Wikipedia page about Leclanche cells does not seem to suggest that they were the common ordinary carbon/zinc batteries everyone used before Alkalines.? Are you sure you have that right?
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Andy
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Re: Batteries
On Fri, Feb 28, 2025 at 04:03 PM, Roy J. Tellason, Sr. wrote:
The only place I've ever seen AAAA being used was in laser pointers. And you can get 'em by siassembling a 9V, cheaper than buying them as AAAA...My wife has something that uses one.? I think it goes with her tablet.? From about 5 years ago. ?
I got replacement AAAA cells at either CVS or the local grocery store.? They were relatively cheap at about $3 for a packet of 2 or 4.? Maybe that isn't cheap by everyone's standards, but it was good enough for me.? I think it would cost more to buy a pair of 9V batteries and cut them open, if that is really where you got yours from.
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Andy
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Re: Batteries
wn4isx
Nice! I've never met a flashlight I didn't fall in love with. I have some Soviet flashlights, varnished cardboard tubes and reflector and the glass has rough edges like it was snipped from window glass.
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A funny story about flashlights. ? Kentucky might be called "the land of caves." There are caves all over the place. ? Mammoth Cave, and private nearby caves, are famous. ? Floyd Collins was trapped in a cave and the coast to coast radio coverage mesmerized the nation. [he was an idiot, there was a back way out.] ? While I was born in Eastern Kentucky I lived in Central Kentucky from the tender age of 3 months on. ? When I was 6 the older boys talked me into exploring a cave under a mansion that was being torn down. We came to a large room with many tunnels going off in every direction. ? They brought me because I had 3 flashlights. ? In college a classmate was fascinated by the Underground Railroad and had diaries that mentioned how runaway slaves would use the caves in Central Kentucky as part of the underground railroad. ? According to her diaries, you could go from Versailles road (Kenland Race track) to Russell's cave underground. ? And nope never had the chance to go the full route, but I did go on parts and have no doubts in 1850 it was possible for a dedicated person to make it all the way. ? I've been in over a dozen private caves. ? [It's OK everyone knew I didn't have a lot of common sense anyway.] ? My wife is claustrophobic in a way that makes my acrophobia look like a mild dislike. I was shocked when she decided we were going to Carter Caves. ? She girded her loins and we went through all the guided cave tours. There is another cave that is self tour. You have to check in at the ranger station and they insist everyone in your party must have a flashlight. ? The lady was nice and said "We really like for people to have a spare flashlight." ? So I started pulling out flashlights and told her to say "when enough is enough." ? I had 20. ? My wife only had 6. [the slacker] ? The lady sort of freaked "We've never had anyone with that many flashlights!" ? I didn't have the heart to tell her I had spare bulbs and batteries. I might well die in a cave but it probably won't be in the dark. ? Don't get me wrong, I am not afraid of the dark, it's just I'm not a bat that works with echolocation, in my view of reality, God gave me eyes to use. ? I mentioned in another post how I'd swipe my Dad's WWII flashlight and hide in closets. I was less then clear. Yep I liked making light in the dark, but I could sit in the dark for hours and not worry in the least. ? I wish the same could be said for my poor mother. She eventually accepted "The doors are locked, the windows latched, he's in here someplace. I could curl up in places you'd swear no human child could possible fit. ? I also still have some luminescent plastic toy soldiers from back then that glow in the dark. I could sit there for hours and watch the light decay, then blast them with the flashlight and instant bright glow.? ? ? But one of my favorite all time memories was the look of utter disbelief as I started laying flashlights on the check out counter. The ranger was shocked speechless. [I've often had that effect on people] ? ? Of course I have been caught without a flashlight a time or two when I needed one, really needed one. ? You change the fuel pump by feel in a 1968 VW bug at 3:00AM in the Red River Gorge Nature Preserve, on a moonless night, with nothing but starlight. Those 2 13mm nuts and hose clamps are soo much fun words fail me. ? [My wife is reading over my shoulder and just had a severe attack of the giggles. The wench.] ? Starlight is actually brighter then you might suppose .... after your eyes adjust. Not bright mind you, but you can sort of almost make out your hand. ? One time I changed the fuel pump with the light from an HP-35 sat to display all 8s for "maximum light." It was so much better then starlight. ? One might think I'd either have had flashlight or added an under the hood light. Nope, not that wise. ? I now carry 3 LED flashlights, spare batteries, have a LED light bar under the hood and in the trunk. ? Of course the chances of me being in Red River Gorge at 3:00AM are rather remote now that I'm 73 and the Gorge is filled with drunken druggies. I don't know enough people with enough firepower to make a 3:00AM pit stop safe. ? And changing the fuel pump in a modern car is no casual undertaking. ? Such is life. ? ? I made an "el cheapo" night vision device. I picked up a new in the box Android phone "virtual reality headset." ? Now I have about as much use for a gaming accessory as I do a hard hit upside the head. ? But, you can carefully drill a hole so your camera phone lens can see out. Illuminate the dark area with IR LEDs and viola instant sort of night vision device. Of course there is zero depth perception. But, as proof of concept is was sort of neat, all the more so because the VR headset cost me all of $5. [I'm cheap.] ? And I have IR illuminators, boy do I have IR illuminators. A 60 X 60 aray that draws 2 amps. It's deep IR so you can't see it with the naked eye but your smart phone would love it. ? I also have a slew of surplus 30 IR LEDs mounted on a ring to go around a closed circuit TV camera lens. ? So I can flood an area with IR. ? ? ? A friend wants a night vision headset with a crossbow equipped with an IR laser pointer. Robert always was a tad strange. ? ? ? |
Re: Batteries
开云体育Noone has mentioned the flat 4.5 V flashlight battery.? It was very common when I was growing up in Sweden. The size was 65 x 60 x 23mm and fit nicely in a pocket. See: Often the lamp was at the end, not sideways. ? The other flashlight I remember was hand-powered by squeezing a lever.? There was no battery, so it was a hand exerciser. It fit nicely in the hand.? Not like the models sold with and external crank to turn. ? Bertho |