This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The number in parentheses corresponds to the second channel, for a stereo version.
This circuit is from a book of transistors from 1954. The transistors are from the time and the...
This circuit generates an FM signal of 4.7 or 10.7 MHz for audio signals on analog TV or FM, with...
Found in a 1969 documentation on neon lamps, it actually takes advantage of the durability of the neon...