I've been experimenting with electret replacements for the D-104 crystal element. I found this site with a really excellent description of what lies inside those little electret capsules. Here it is:
http://www.openmusiclabs.com/learning/sensors/electret-microphones/index.html
We’re a garage band, we come from garageland
-
Hi, FastRadioBurst 23 here letting you know of a couple of our shows this
week. On Sunday 28th April 2024 at 0900/1300 hrs UTC on 6160 kHz and then
at 2000...
6 hours ago
You could have just opened one up, they are cheap and available. I did years go, was surprised that the FET, while in a small package, was still a recognizable device. I was expecting blob of epoxy.
ReplyDeleteI think it was 1968, Popular Electronics had an article about how electrets worked, and even had a sidebar about making your own. Used the high voltage from a color tv set to provide the charge.
Electrets are like electrostatic headphones, except no HV supply needed. While there have been construction articles about making electrostatic speakers and even headphones, I've never seen a construction article about making electret headphones or even speakers.
Michael