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richms
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  #2015767 14-May-2018 14:28
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Using one adapter across multiple things causes groundloops. I solved my crappy CCTV picture on the analog cameras (basically sould see the colour from one camera over the top of the other camera) by swapping from one adapter powering everything, to several separate 12V adapters.





Richard rich.ms

mdf

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  #2016001 14-May-2018 19:43
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Dagnabit.

 

Everything was fine using the replacement transformer last night. But woke up to no internet this morning. After a (lengthy and expensive) false start, eventually traced the problem back to a tripped breaker. Reset the breaker and everything worked fine.

 

Except the router. No lights at all. Replacement transformer is totally dead. Briefly tried it using the big heavy transformer that was a candidate further up the thread and it seemed to start up okay.

 

It seems that the most likely explanation is a fault with the router and it should be replaced. Two transformers ceasing to work in the space of 36 hours is pretty damning.

 

But I guess there is a chance that the replacement transformer was just junk (I have no idea where I got it or how long it had been sitting in a box waiting for its opportunity to take centre stage). Given I don't want to fry anything else or burn my house down, this needs to be done by someone that knows what they are doing.

 

Queries are, what type of test should I be asking them to carry out, and what kind of money would it take to carry out such a test? No point in throwing good money after bad.


 
 
 
 


richms
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  #2016004 14-May-2018 19:49
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Well it could have been mislabled junk. If it came with something that was "value oriented" they may have wheedled the adapters down to one that barely worked, but kept the labling of the origional specced one or something.

 

Plenty of junk adapters, and a short or overload on the output wouldnt cause a breaker trip on a legit adapter. I would say it arced over inside or something from poor clearance, and being old and full of dust





Richard rich.ms

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  #2016036 14-May-2018 20:32
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This might be terrible advice, but I would probably see if it blows up a third adapter before doing anything else (perhaps with some closer supervision). If it does, I can't imagine there is going to be any sort of economic repair for it.

Aredwood
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  #2016099 15-May-2018 02:25

mdf:

Dagnabit.


Everything was fine using the replacement transformer last night. But woke up to no internet this morning. After a (lengthy and expensive) false start, eventually traced the problem back to a tripped breaker. Reset the breaker and everything worked fine.


Except the router. No lights at all. Replacement transformer is totally dead. Briefly tried it using the big heavy transformer that was a candidate further up the thread and it seemed to start up okay.


It seems that the most likely explanation is a fault with the router and it should be replaced. Two transformers ceasing to work in the space of 36 hours is pretty damning.


But I guess there is a chance that the replacement transformer was just junk (I have no idea where I got it or how long it had been sitting in a box waiting for its opportunity to take centre stage). Given I don't want to fry anything else or burn my house down, this needs to be done by someone that knows what they are doing.


Queries are, what type of test should I be asking them to carry out, and what kind of money would it take to carry out such a test? No point in throwing good money after bad.



Lots of poor quality power supplies coming from China. Maybe you had 2 in a row. Have been a lot of safety issues with them. Otherwise maybe both of your power supplies were end of life anyway. There was a time when lots of faulty capicitors were being made in China. Which would often fail short circuit. But not immediately at switch on. So again your power supplies might be affected.

If you want to buy a new power supply, get one from Jaycar. Sure it will cost more than Aliexpress. But at least it will actually be built to the correct safety standards.





neb

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  #2016103 15-May-2018 03:10
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mdf:

Replacement transformer is totally dead. Briefly tried it using the big heavy transformer that was a candidate further up the thread and it seemed to start up okay.

 

 

When you say transformer do you mean literally a transformer-based linear power supply, or a power brick in general? Decent switchmode supplies would have extensive protection circuitry that would deal with many types of faults, while older linear-regulator based ones would often cook themselves even if they had some nominal protection circuitry (e.g. the 7800 series).

mdf

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  #2016288 15-May-2018 13:41
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neb:
mdf:

 

Replacement transformer is totally dead. Briefly tried it using the big heavy transformer that was a candidate further up the thread and it seemed to start up okay.

 

When you say transformer do you mean literally a transformer-based linear power supply, or a power brick in general? Decent switchmode supplies would have extensive protection circuitry that would deal with many types of faults, while older linear-regulator based ones would often cook themselves even if they had some nominal protection circuitry (e.g. the 7800 series).

 

The correct electronic terminology is not my strong suit (hence the post title). It a power brick that is physically larger and heavier than the average power brick. It is inscribed with the following arcane runes:

 

 

I don't think this is what you mean by "transformer".

 

I've been working from home today and judiciously plugged in the router where I can keep an eye on it, and not plugged in to anything else. It's been running about ~5 hours now without setting fire to the house (good sign!). The router isn't running hot or sparking or anything else (further good signs!). I will do a bit more testing but assuming things do carry on as they are, perhaps a new power brick is the answer.

 

Somewhat off topic, but given this seems to be the right crowd to query, a UPS has been on my to do list for a while. Rather than replace the existing power brick one to one, what do people think of a DC UPS like the Constant Vigil reviewed on GZ a while back? I've never been quite sure whether things like surge protectors and power conditioners are (a) an absolute requirement or (b) complete snake oil. I've been sucked in more than once on upgrading power boards featuring such features and maybe a UPS would be a better option?


 
 
 
 


neb

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  #2016293 15-May-2018 13:49
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mdf:

It a power brick that is physically larger and heavier than the average power brick. It is inscribed with the following arcane runes:

 

 

That certainly looks like it's a transformer-based one, so it'll be a low-efficiency supply with little protection circuitry against faults. I'd get a good-quality switchmode supply/power brick and run everything off that, even if there is a fault it should (fingers crossed) shut itself down rather than cooking itself or damaging the equipment it's plugged into.

Rikkitic
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  #2016315 15-May-2018 14:24
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I have a Constant Vigil and am very pleased with it. In addition to absorbing any power spikes, it also works perfectly for power cuts of varying lengths. We are rural and we lose power every time a boy racer wipes out one of the poles. Since our Internet and phone both depend on wireless RBI, we get completely cut off every time that happens. I had it customised by the manufacturer to supply 12 volts for the router and 5 volts for the phone and we have never had any problem with it. We use it with a small SLA battery and it has run up to five hours without dying. I don't know how much longer it would go. The bigger the battery, the longer it lasts. It has been brilliant for us and we couldn't live without it. Great value for money. It also works well with solar or any power source but we haven't got around to that yet.

 

 





I don't think there is ever a bad time to talk about how absurd war is, how old men make decisions and young people die. - George Clooney
 


mdf

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  #2016322 15-May-2018 14:40
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@neb - like this?

 

https://www.jaycar.co.nz/switchmode-mains-adaptor-12vdc-1-5a/p/MP3486

 

Might still look into UPS stuff but want something to cover the procrastination/dithering phase of my purchasing decisions.


neb

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  #2016337 15-May-2018 15:00
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mdf:

@neb - like this?

 

https://www.jaycar.co.nz/switchmode-mains-adaptor-12vdc-1-5a/p/MP3486

 

 

Hard to tell what this is in terms of efficiency/safety class, but it's also a wall wart (annoying) and has a fairly low current rating. Here's one from Orstralia, MEPS class VI, which is what I'd go for:

 

 

http://www.radioparts.com.au/product/33771345/sm1265-12v-dc-6.5a-power-supply-switchmode-2.1mm-cen-tve

 

 

or more generally:

 

 

http://www.radioparts.com.au/ProductDisplay.aspx?popup=1&Category=SXKK2515&Product=33771340&ProdDesc=SM1250+12vDC+5A+SWITCHMODE+POWER

 

 

Otherwise, look for CCTV power bricks which are several amps at 12V, only thing is they don't usually advertise the device quality (= MEPS class). You can also get them from Amazon, and less safely eBay and even less safely Aliexpress, but who knows whether they're genuinely MEPS anything.

 

 

Depends on how OCD you want to get about the whole thing :-).

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