12V 1A can be used to power a wavgat one r3 board

Projects General Guidance
1

hello good morning, I have a wavgat one r3 board and a 12v 1A transformer, I want to know if the board with this transformer can suffer any damage, at the back it says IN: 7.0V - 9.0V (peack 15v)

2

-asVI don't think I'd do it. The specifications of the wavgat say 7-12V so you would be at the max and allowing for no error. Also, transformers, in a true sense, are not DC but AC so make sure your device is providing DC before attaching it at all.

3

GabrielNicolau:
hello good morning, I have a wavgat one r3 board and a 12v 1A transformer, I want to know if the board with this transformer can suffer any damage, at the back it says IN: 7.0V - 9.0V (peack 15v)

If your DC supply is 12volt regulated, then you can use it.
But it's not wise to do so.

With 12volt on the DC socket, you can't power much from the Arduino (sensors etc.)
You are limited to about 100mA max before the 5volt regulator overheats and shuts down (if you're lucky).

Better use a 7.5 or 9volt regulated supply, or even better, power the Uno through the USB socket with a 5volt cellphone charger.
Leo..

4

I found a 9 Vcc 200 mA transformer, is it advisable to use it? thank you very much for responding

5

I assume you don't mean a bare transformer, but a plug-in the wall supply (plugpack/wallwort).
An unregulated (old type) power supply could produce more than 12volt unloaded, and could have a large ripple on it when loaded.
Old/heavy/transformer/unregulated power supplies are potentially dangerous to electronics, don't use them.
If you're not sure about the type you have, then post a picture of the sticker on the supply.
Leo..

6

is the charger of a landline

7

GabrielNicolau:
is the charger of a landline

What does that mean.
Post a picture.

8

the photo was not published in the previous post, here it is

Screenshot_20191222-124748_WhatsApp.jpg
Screenshot_20191222-124748_WhatsApp.jpg1080×1920 277 KB

9

Most likely heavy/transformer based/NOT regulated, so not very safe for electronics.
You could measure it's output voltage. Could be 12volt or more unloaded.

As said, use a 5volt cellphone charger, connected to the USB socket of the Uno.
Leo..

10

I have a cell phone charger that is 5v and 2a, but those 2a are not much for the board?

11

The board will consume what is needed so you will be OK.

It's like a 40 W light bulb in the house; it only consumes 40/220 = ~ 200 mA, not the e.g. 16A that is available.

12

OK! thank you very much for taking your time to respond