This circuit was obtained from an American technical manual from the 80's. The integrated circuit is an operational of the time that can be replaced by a modern equivalent.
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...
We found this circuit in a 1972 documentation. The transistor, in fact, is a unijunction that can...
This circuit comes from an English publication of 1976, consisting of an experimental touch key....