Make A Crystal Headphone

SC2-300 sound powered earpiece

SC2-300 is the most famous sound powered earpieces in China.  It's a decent earpiece with venerable

 sensitivity. It's used to be phone earpieces back into old days.

I had several of them.  Recently decades built these earpices might be less sensitive. On it's peak perfermance,  SC2-300 could do everything like USI/Dynalec earpieces. It's gonna received power line noise with 1 or 2 meters long wire in room, It's a remarkable sensitivity.

Install SC2-300 to A modern Headphone

It's definetely need a Headphone to hold the earpieces. Most easy way is modify a modern Headphone. 3D printer help a lot to fit the earpices to headphone support.

3D print help fit the earpieces very well

Even though the headphone feels tight a little bit, but  gains sensitivity.  Keep  quiet as possible, it's rule number one for sensitivity.