[jglauche]

Hey, I made the prototype for it. I reverse engineered a Littmann cardiology 3 and used a similar diaphragm setup. For the early prototypes I used the one that came with the Littmann stethoscope; later on we got the same result with different approaches, such as cutting out one out of transparent plastic sheet or using shrinkwrap around it.

[anfractuosity]

Cheers, that's very interesting!