Hello. It really depends on what you want to put in you GBZ. But for minimum without cartidge reader : - 1 control board : teensy or Leonardo etc.. (except if you go GPIO controls) - 1 Audio amp (Pam 8403 or something similar) - 1 speaker - some resistors (check wiki) for low filter pass - 1 volume...

So what extra parts will i need if i just go with a PCB? fairly new to this, saw the original guide about a year ago but was too intimated but recently saw some custom parts to make it all easier. obviously getting an AIO isnt very easy right now but im willing to work around it. just need some help...