Collaborate Disseminate
Although there are systems that allow physically challenged users to communicate by twitching facial muscles, for some people even those muscle movements are impossible. A new setup offers a possible alternative, however, by going into the ear.Continue… Continue reading Assistive tech may let locked-in users communicate via “ear-clicks”
Your daily round-up of some of the other stories in the news! Continue reading News in brief: Facebook moderators revealed to terrorists; WikiLeaks release Cherry Blossom; language-translating earpiece
If you make crystal radios, you’ve probably got a few crystal earpieces. The name similarity is a bit coincidental. The crystal in a crystal radio was a rectifier (most often, these days, a germanium diode, which is, a type of crystal). The crystal in a crystal earpiece is a piezoelectric sound transducer.
Back in the 1960s, these were fairly common in cheap transistor radios and hearing aids. Their sound fidelity isn’t very good, but they are very sensitive and have a fairly high impedance, and that’s why they are good for crystal radios.
[Steve1001] had a few of these inexpensive …read more
