Power converter

[kyphos]

If your CCTV cams run off 12VDC, you can use an approach like this:

Possible alternative powering method?

Most alarm systems run on 12VDC - looks like yours does. If that’s the case, you could rewire the alarm loops to draw 12V from the alarm panel. Then use a converter at the far (camera) end to get 5V. Rick suggested one such device. Another is this one: https://www.amazon.com/SV-PC02-Hardwire-Charger-Dashboard-Recorder/dp/B07BQQFJBG/ There’s a category of such converters intended for powering dash cams and other automotive accessories. You’ll find lots of them on-line. They generally come w…

Or like this:

Solution for USB power from house doorbell AC wiring?

@Darren, There are a few ways to handle this, depending on how handy you are with soldering irons and electronic components. One approach is to reuse the doorbell wires, but disconnect them from the bell transformer (somewhere in the basement? in the utility closet, etc) and connect instead to a PoE (Power over Ethernet) injector. These are commonly available online - used for security cameras, VoIP phones, and other such gadgets. Then use a USB PoE splitter to convert the PoE voltage into 5V…