6 May
2014
6 May
'14
14:36
Billie Walsh wrote:
>>Some early phones were purely acoustic for example.
wire-and-tin-cans ?
Air voice pipes in ships... Yep, good example too.
What about the sound powered phones used on ships?
They weren't acoustic. They simply derived all their power from the speakers voice. A dynamic microphone produces an electrical signal, which can be used to power the speaker at the far end. When I was a kid, there were toy phones that worked that way. However, they weren't useful for long distances. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org