Re: Charger circuit questions
Oh, I totally made this because I'm the type that like.. buys batteries in bulk for a lot of things and liked testing stuff. I wanted to see how good the top 5 AA's were on amazon before I purchased the larger quantities... That, and this little thing is pretty handy for other things, like monitoring how much power a circuit uses over a long time period. (I used it to test a motion-activated cellular device over a month to see about how much power was consumed.)...
Retro-Hipster
Tinkerer
Last Activity: 12-05-2019, 01:13 PM
Joined: 04-23-2019
Location: Salt Lake City
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Re: Charger circuit questions
I could send you guys a simple Arduino load tester/schematic/spreadsheet I made a while back for testing batteries. Basically, it's basically just two voltage dividers and a current sense resistor. One divider reads the voltage before the current sense resistor to get the voltage of the power source (battery) and the other measures the voltage drop over the current sense resistor. There is a terminal for the battery input and then another terminal for output. The output can really be any resistive load, like an appropriately rated resistor....Leave a comment:
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Re: Why does my Uni-T multimeter not measure anything?
Ah... it's a shame a board that spacious doesn't have A) a 10a fuse and B) HRC fuses...
Ironically, that little gap where the trace was would probably fit one of those tiny 10a hrc axial lead fuses and give your meter an upgrade. Lol (Just heat shrink it well to keep it from the shunt/other terminals.
[url]https://cdn.badcaps-static.com/pdfs/ae33e9e139b8a6996edb34b127d9a063.pdf[/url]Re: Why does my Uni-T multimeter not...s doesn't haveLeave a comment:
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Re: Why does my Uni-T multimeter not measure anything?
STJ speaks wise words. lol
Also, I know that this situation is a bit different since you were testing the socket, but if you work commonly with mains stuff I would suggest making a light bulb current limited supply. For the cost of an extension cord, a ceramic light socket and a tungsten/halogen bulb, you can have a socket that will light the bulb up when you make a short while also protecting your equipment/device under test..Leave a comment:
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Re: Charger circuit questions
AH, actually, DGW purched a lot of different obviously fake batteries like that one and did a full load test and such. Many of them came out closer to 500mAh than 5000. He definitely knows that they are crap.. I think he just likes things that are dangerous. :'D Dude made a damn x-ray machine in a yellow parts bin... you know he has to be crazy.
You should check out his videos on the subject Sam. It's both entertaining and insightful.Leave a comment:
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Re: Powering up a Car Antenna a "different" way
Hmmm..... From what I could trace visually Sir, if you reversed the red and black wires, you would then need to touch the green wire to the NEGATIVE of the battery. Give that a shot. You may want to check the relay model and just verify that the datasheet doesn't show any diodes in the package first though. You'd normally expect a diode across a relay, so it's wierd that there don't appear to be any on that board. It might be internal on that relay...Last edited by Retro-Hipster; 12-03-2019, 07:02 PM.Leave a comment:
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Re: Charger circuit questions
Wow, I was so wrong with what was on the circuit board... that was embarrassing. Ahahahaha There isn't even a second chip on the board! Just half-bridge rectification, some support components to clamp the supply voltage and then a purpose made chip. >.<;;;
Based on the datasheet this is just not programmable at all sir. You would be much better off just getting a new thing.. :x And yes, DGW has many rediculous batteries. haha He also made videos about how ridiculous they are. The 5000mAh one weighed like 1/2 the weight of a 1200mAh...Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
AH, yeah, honestly this whole thing just stemmed from the thought that you could do a pretty simple active/passive failover with a relay and a few support components. ^.^; I didn't even really have an intention of drawing up a schematic, but people were asking some questions about it. (I certainly didn't intend on Hijacking Danny's thread.. SORRY DANNY!) Frankly, under any normal circumstances, I would probably just use oring shotky diodes on two supplies or use a couple of mosfet's as a stand in's. If I needed fancier I'd just go...Last edited by Retro-Hipster; 12-03-2019, 01:02 PM.Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Ah.. It posted my post twice. :/ also, i have been messaging using my phone.. It seems that it has auto corrected some stuff. :| oh, also, i didn't notice that the schemaic I posted had 16v on one of the supply voltages... That should be 12v..Last edited by Retro-Hipster; 12-02-2019, 08:45 PM.Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Okay! I drew up the schematic in everycircuit to try to explain this a little bit better. there are some limitations to the layout capabilities of everycircuit so it's a bit of a mess.
[url]https://netorgft4619478-my.sharepoint.com/:i:/g/personal/retro_retro-hipster_com/EeYSgBOvmy9Mhu8nmEm1qD4BgiRXd9ScRsPjNMNzawY1hw[/url]
For an explanation of how the circuit works you can watch this video I made.
[url]https://youtu.be/cxZXUr33Ic8[/url]Re: CCTV cameras: single PSU or indi...<br /> <br />Last edited by Retro-Hipster; 12-02-2019, 08:46 PM.Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
That would depend on what the latch circuit is. if you're talking about the simple circuit with the relay then just turning on the primary PSU would click the relay on. Since the relay on. If the primary psu turned off, the so would the relay, switching the power to the secondary.. in terms of what could be used as a latch, you could do this with several things. You could do this with a relay and A switch for instance. ( press the switch to turn on the relay. The relay then powers itself through the output.) Give me a sec and I'll...Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Ah, I will do so later for sure.
In the simple circuit, I would be relying on something like this circuit (low-tech 12v battery undervoltage protection).
The circuit would be powered by the "primary" psu. If the psu shut off or dropped below a voltage threshhold the relay would turn off and the normally closed position would engage. That would switch the LOAD to the secondary psu.
The problem I see with this though is that the unloaded primary psu might turn back on...Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Hmm... You know, you could make a super simple failover for a 12v bus by using a relay. So like, you could get 2 of those meanwell supplies and then have the psu's sitting in an active/passive setup. The primary would power the relay and the relay would be set in a normally closed position.. Then if that psu failed, it would cut power to the psu and switch over to the secondary psu.
Kind of a janky hack, but it could be fun. haha I think to do it real proper you'd probably want to power the relay with something...Leave a comment:
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Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29
EDIT: Ah crap... I missed the second page of this and responded to an old message. LOL Well, next time I'll read..
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AH.. Please be safe when doing all of this sir. ^.^; AC likes to kill people because it let's current flow through you in ways that DC doesn't. Also, 120v power will charge up capacitors up to 170v, so you can get a heck of a kick off them even after things are unplugged.
First off sir, could I suggest watching this video for information on all the types of basic discreet...Last edited by Retro-Hipster; 12-01-2019, 06:01 PM.Leave a comment:
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Re: Yamaha Electric Piano CLP550 no keyboard output
Wow, this has been a fascinating Read guys. I know very little about ROM dumps and such. Really though, this is Badcaps at it's finest. What a great collaborative effort on everyone's part. ^.^Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Yeah, I use rescue PSU's for all sorts of fun stuff. haha For instance, all the bench lighting on my bench is powered by the 12v from a psu. I also have a few of those little buck converters with the screens mounted around for a quick source of power. (Still have a decent Bench supply, but meh.) Most of the time though, the PSU's I deal with are just from old pc's. Because I'm "the boss" I worry that taking server type hardware home would set a bad example. (We often sell our old server stuff to reseller types.)Leave a comment:
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Re: Where find example circuits with explanation?
AH, I would first watch/read a good basic components video or guide. I highly recommend this video from Big Clive:
[url]https://www.youtube.com/watch?v=6Maq5IyHSuc[/url]
If you wanted a nice, basic, and fun book to learn from you can't really go wrong with "Getting started in electrons" written by "Forest Mims". It can seem overly basic at times maybe, but it covers a lot of really fun/easier to make projects using discreet components. It's also written to be accessible by a wide range of ages,...Leave a comment:
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Re: Charger circuit questions
AH, without a datasheet this could be hard. No matter what, I think you risk blowing up your device if you change things. (most likely, killing the mosfet)
Honestly, if you wanted to use this as a learning experience I would find a charger with an IC I could get a datasheet on. Most of the time a 5$ charger off of ebay will have one of these chips. Cheap stuff likes to use ic's with good datasheets that have schematics in them, or so I have found. (Might be chinglish, but probably still ok.)
Well, beyond those...Leave a comment:
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Re: CCTV cameras: single PSU or individual PSUs ?
Ah, I haven't been back here in a while! Looks like you have some more interesting conversations going Danny.
I will say that I have had to deal with a fair amount of the "cheap chinese psu" power source for analogue cameras in my Career. (I am a network admin/it systems manager.) From what I have seen, the ones that are going to die tend do so either in the first year or after someone decides to push it too hard by adding in a bunch of extra cameras. (Ie: bumping it's utilization from 40% to 60%.) It...Leave a comment:
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Re: Ubiquiti Nano Loco M5 5ghz, does not turn on, internal buzz
I would probably take my meter and check how many ohms are reading on either side of some of the power rail capacitors. You might have a short that is pulling something to ground. For instance, you mention that touching your finger across some of the pin tends to start things back up. That could be because some corrosion is keeping the "reset" pin pulled to ground (or pulled high depending on the chip.) It could also be that something has gone higher resistance, such as a resitor on a voltage sense circuit/divider....Leave a comment:
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