I recently came up with a broken gameboy classic, so i wanted to use the case for something useful. My first idea was to put in a tiny television (aka LG's HB 620 T) But due to the bad software used in it, i decided to cancel this. Another try with a slightly bigger portable television didn't leave me happy, as i would have had to change the display window of the gameboy too much, which would have led to losing it's original face.
So I left the case in the closet for some weeks until I stumbled upon an old russian geiger counter I bought some 15 years ago on a flea market.
At that time I totally messed up the original case and never was happy with it (obviously!)
my costs for this project were:
40 $ for the geigercounter (long ago, so somehow not addable )
15 $ for the half bricked gameboy
4 $ for the rechargeable batteries
5 $ for both relays
4 rainy weekends sitting in my workshop :)
First I took apart the geiger counter and measured its PCB if it would fit in any way into the new case.
Surprisingly it fitted like a charm after cutting out the bottom of the battery compartment with my electric scrollsaw.
The next step was to make sure, i could use the original power switch. So i just cut it of the gameboy's main PCB (including the power jack).
I tried to use the original gameboy speaker, but it wasn't loud enough, so I went for the geiger counter's piezo - that indeed did have nearly the same diameter.
I had to cut off a bit of the front PCB for the piezo speaker to smoothly fit in.
Next was to cut a window for the old 4-digit-LCD into the front PCB. To be honest, I just marked an estimate of what i had to get rid off. I later had to enlarge the hole a bit more.