I have received my A47 headphone amp, but i seem to have a few problems. Since the amp doesn't have [ground?] the maker of the amp says that I have to use 2 9vs and use the connecting part of the 9vs as ground. I tested the amps today, and it seems like it works for around 10 seconds, and then I...

I was thinking about making an enclosure for this amp: It is too long to fit an altoids tin, so I was wondering if covering the components with hot glue/any other things that dry up hard. That way it would still be small, and at the same time be rugged

I have an extra PSU, and since its extremely old, i was wondering if i would use the wires attached to the motherboard and other devices to create a 3.5mm interconnect? Also, would it work for CAT5 Ethernet cable?

Is this a decent headphone amplifier? What is comparable to this amp? It is called a 47 Headphone Amp. This is really cheap and on a chinese site, but I cant seem to find anything about it! EDIT: pictures added