Hi, i am realizing a smart doorbell for my house and after i created the circuit and the software i was ready to plug it in using my recently bought buck converter, so i connected first the buck converter to the input power and lowered it to 5volts just to power the arduino and the rele module,
but when i unplugged the buck converter and plugged back in i noticed that the voltage was much higher than the voltage i have just setted, so i tought in case of a blackout how can i protect my arduino from blowing up? (i just burned down one trying 
)
ty for the help
Normally you adjust a converter with some load on the output.
No idea what the process is need for your mysterious buck converter.
You can add a 5.6v zener on the out of a converter for protecting the load, however, don’t know what your setup is like.
hi, i am really a novice in fact of converters so i have a very basic setup like the converter was directly connected to the arduino, I have doubts about how to use it in general, for example if the power were to go out would it go back to supplying more current than I had set? And if so, how can I prevent this from happening?
That information should be in the datasheet or on the product page for the converter.
Post a link to it.
What is the power source to the converter?
Is that the same source used to set the output voltage?
I moved your topic to an appropriate forum category @Filippo2019.
In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.
This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.
Thanks in advance for your cooperation.
oh well you are right i ain't tought that ahahahah, i actually found a new solution, the right one for this application, to use a actual transformer from 15v c.a to 5v c.a that i have found on amazon, by any chance do you know any european like eshop for specific electronics and arduinos ecc ecc?
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