Trying to power a Raspberry Pi with an attached screen. Requires an adapter, don't know much about the technical term of what type of socket, but all the old modems in our house (as well as our new one) accept the same connector as the one I need. All of them are between 9 - 12V / 1 - 2 A so I believe they are incompatible.
Manufacturers said it required 6V but the adapters they provide (5V / 3A) ran max output at 5.5V and worked fine with the screen. So I'm looking for a power adapter that fits the bill.
The nearest thing I could find was DSE selling this, max output 5.4V. It is quite expensive though. Seeking recommendations about where to find a power adapter, and maybe some advice on how to pick one safely (and if someone could tell me the type of connector based on my description, that'd help). Thanks