Hello.

I have a modem and a wireless router. Both requires 12V and 1.5A of power. I have a universal adapter which gives output of 15V and 6A. Is it possible to connect both devices to this single adapter?.

 

yes, provided the Voltage stays at 12VDC to 15V DC under load

Rifaa

 

No, you can't, you will burn them.

You can use a voltage regulator IC to provide 12V from the 16V.

 

Oh how nice. One says you can and one says you can't.

Of course both are right as it depends on the modem and router.

I'll tell you what to do next.

If the modem and router both come with their power adaptor, then measures the voltage output of their respective adaptor without connecting to modem or router.

If you get 15V or more on both, then the answer is YES you can because the 12V modem/router will most probably has its own voltage regulator built-in.

If either one or both shows +12V, then you can't connect either modem or router to 15V. You will risk damaging them in doing so.

Or you can post back the voltage measurement here and let us decide.