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 circuit was obtained in a Popular Electronics of the 90s. It against a kitchen hood based on...
Many designs that use transistors and integrated circuits are powered by a 6V voltage, normally...
This transmitter for the 2-meter range with a power of 1.5 W was found in a magazine 73 for radio...