24v AC to USB-A power conversion case

I need to use existing 24v AC power (doorbell transformer) to supply a Blink camera needing USB A (5v). I located a AC to DC “buck converter” and had a DC to USB-A stepdown module.

I whipped up this case to house the two bare modules using some 2.1mm x 5.5mm pigtails I already had.

Not sure how much heat this is going to generate so I put some air holes.

The Buck Converter has some holes to mount so I just put standoff & posts that can be melted with a hot iron to secure it. The USB module is captured in a slot and kept in place by the post designed into the lid/cover. I soldered scrap of braided two conductor wire from the USB module to the Buck Converter screw terminals. I use some low profile M3 screws to secure the lid/cover and the box has screw ears to mount it.

Lid/Cover takes 2-4 M3x8mm screws Low Profile Socket Head

Use #6 or 3.5M flat head screws for mounting.

AC/DC to DC Buck Converter

    https://www.aliexpress.us/item/2255801014012526.html

DC Stepdown Module USB-A

    https://www.amazon.com/dp/B087RHWTJW

2.1mm x 5.5mm Pigtails:

    https://www.amazon.com/dp/B072BXB2Y8