Transformers
-
Looking for very small 220vac to 3.3vdc transformer module. I have a project that involves controlling 2 220V water heaters. The project box is fairly small, so the smaller the better.
-
-
-
Maybe small usb wall charger for 1,4$, and regulator from 5V to 3.3V for 0,1$ would be good solution?
-
Looking for very small 220vac to 3.3vdc transformer module. I have a project that involves controlling 2 220V water heaters. The project box is fairly small, so the smaller the better.
@ServiceXp I've been looking at things like this http://www.digikey.com/product-highlights/us/en/cui-vsk-series-encapsulated-ac-dc-modules/853
-
@ServiceXp I've been looking at things like this http://www.digikey.com/product-highlights/us/en/cui-vsk-series-encapsulated-ac-dc-modules/853
There are smaller things too, http://www.cui.com/product/resource/pbk-3.pdf but I don't like the clearance on that component. and it has no temperature protection.. But there are tons of things to choose from. tell me if you find something you like.. :)
Digikey searchEdit; NOTE:
If you are playing with mains BE CAREFUL about if you are buying a insulated one or not, You could have something like ~225v on your 0v and ~230v on 5v and if you touch this you will smoke. -
There are smaller things too, http://www.cui.com/product/resource/pbk-3.pdf but I don't like the clearance on that component. and it has no temperature protection.. But there are tons of things to choose from. tell me if you find something you like.. :)
Digikey searchEdit; NOTE:
If you are playing with mains BE CAREFUL about if you are buying a insulated one or not, You could have something like ~225v on your 0v and ~230v on 5v and if you touch this you will smoke. -
Maybe small usb wall charger for 1,4$, and regulator from 5V to 3.3V for 0,1$ would be good solution?
@jendrush said:
Maybe small usb wall charger for 1,4$, and regulator from 5V to 3.3V for 0,1$ would be good solution?
For some projects, using cheap chargers can be a good option. However, I'd open any such cheap charger and have a look before using it. Some appear to be acceptably designed, and some appear to be dangerous designs, from the teardowns. For example:
http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html
He rated 2 out of the batch as downright dangerous.
Even with one which appears to have a reasonable design with enough separation, I would not be poking around in the sensors or PCB while they are currently powered from 230V with a cheap charger. Unplug first. And if you need power for programming or testing, use your normal USB supply (eg: a laptop or a high quality power supply) or batteries. Maybe that's just me, but this seems like a reasonably easy additional precaution. Even if the PCB has good separation, the insulation between windings of a transformer could be marginal, for example.
Most readers here probably already know this, just thought it was worth noting for anybody coming to this hobby more recently.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login