Found in na 1969 Electronics World, this circuit makes use of transistors of the time. Equivalent transistors can be used. The diodes can be 1N4004.
In the figure we show the typical configuration of a shared line using a twisted pair where the...
We found this digital CMOS circuit in a documentation from the 90s. The circuit generates signals...
This tuning-free circuit was found in an old operating amplifier manual. The setting can serve as...