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.
With this converter it is possible to tune the signals of the 15 MHz WWV.in AM receiver. WWV is...
This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V...
This circuit is from the Audio Handbook of the National Semiconductor of 1977. Its purpose is to...