This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
This remote listening device was found in documentation from the 50's. The transistors used are...
This circuit, found in an English publication in 1982, has an inverted sequential effect, as the...
This capacimeter was obtained in European documentation from the 1980s. The indicator instrument, a...