Here you can find my version of a phone stand/amplifier.

It is modeled after a Marshall tube combo.

The amplification is done via the echo of the phone speakers reflecting inside the body of the combo.

The slot for the phone is 75 x 13 mm.

I tested it with several models like e.g. Pixel 8 , Iphone 11 and 16 Pro.

The assembly is also very straigth forward.

Just use a little bit of super glue to assemble the control board and front grill.

Enjoy and have fun 😎