Safe In-Wall AC to DC Transformers??

[scalz]

@Moshe Livne : yep! it is the smallest and cheapest I have found. What could be great would be to find cheap and little core transformer to make custom step down.

[sundberg84]

As long as they dont catch fire and deliver 5v im happy! :fearful:

[Moshe Livne]

@scalz How do you connect these to the mains? direct soldering and heatshrink over?

[Didi]

@sundberg84 said:

As long as they dont catch fire and deliver 5v im happy! :fearful:

That´s the problem i see with the cheap ones

[Moshe Livne]

@Didi These are huge... they are 5x5cm. Do you have any idea of their pricing?

[Didi]

@Moshe-Livne

About 20-25 euro

[Moshe Livne]

@Didi ouch!

[Didi]

@Moshe-Livne said:

@Didi ouch!

Yes,but they have over temperature protection :wink:

[Moshe Livne]

@Didi it is cheaper to buy better fire and life insurance :wink:

[Didi]

@Moshe-Livne said:

@Didi it is cheaper to buy better fire and life insurance :wink:

That´s a good point :joy:

[scalz]

@Moshe Livne: it is ordered, I have not them yet. I hope it will be good quality.I don't know.
I agree with you for fire and co. But I think in commercial products they don't use big things.
As we can see on some picture here : http://www.aliexpress.com/store/product/Free-Shipping-Livolo-Luxury-White-Crystal-Glass-Switch-Panel-EU-Standard-VL-C701-11-110-250V/500715_512886492.html
Sure it is maybe not top quality, but I think in fibaro or other it's near the same thing. but I am not sure as I have none. And of course they have enclosure (maybe flame retardant).
Maybe I am not enough paranoid...or you can for example put an onboard temperature sensor for additional security.
But of course, ac is very dangerous, you must know what you do if you don't want to die. You have to take all securities like you said.

[petewill]

Thanks for the quick replies! I am torn. The ones @Didi posted look great but they are large and expensive. The ones @Moshe-Livne and @scalz ordered look appealing because of cost and size but I don't want to sacrifice safety for cost. It looks like they have temperature protection but I don't know enough about electronics to test for safety. Hmm...

[BulldogLowell]

@petewill

I wonder if you could open one of these and solder to the USB power leads...

[petewill]

@BulldogLowell Yeah I was thinking about that too. I'm really trying to keep costs down though. When I hit the $25 price point it's almost as much as a standard z-wave switch when all the other parts and time are included.

[RJ_Make]

My only recommendation; (if you are going to put this in side a utility box, in the wall) might want to find a solution that has the 3 standard safety features. (OTP, OVP, SCP)

These work well, but you need to follow the data-sheet for noise and ripple control.

[petewill]

@ServiceXp Thanks! I wonder if I can steal one of those from an existing device. Any idea what those would be used on?

(OTP, OVP, SCP)

Also, is that Over Temp Protection, Over Voltage Protection and Short Circuit Protection??

These say they are certified and have temp, voltage and short circuit protection. Think it can be trusted?
http://www.ebay.com/itm/351418782712?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[sundberg84]

This post is deleted!

[Moshe Livne]

@petewill @ServiceXp here is the datasheet http://www.hlktech.net/product_detail.php?ProId=54

it seems to have SCP and OCP but the OTP part seems to be left to the elements. I don't see OVP. I understand nothing of this.... Again, these looks well made, none of the crude soldering and flimsy elements you can see in the other converters (including the ones you get from wall warts). However, it being fully enclosed hides most of the details.

[Didi]

@Moshe-Livne said:

@petewill @ServiceXp here is the datasheet http://www.hlktech.net/product_detail.php?ProId=54

I will give them a try and order some for testing in a flush box.

[Moshe Livne]

@Didi Shame you won't be able to get them for the 4th of July :-)