This circuit allows the use of an electret microphone with a 1.5 V source. We found it in the Encyclopedia of Electronic Circuits volume 5 from 1995.
This oscillator found in Electronics Now of the 90s is of the Normally-Off type, being triggered...
Indicated to be used at the sensor input of a PC, this circuit was found in an English...
We found this circuit in an English magazine from 1980. The circuit can be easily assembled even...