This circuit was obtained in a documentation from the 70s. The operational amplifiers used are uncommon today. Modern equivalent types can be tried out.
Found in an old Popular Electronics this circuit is still current. The SCR can be of the 106...
This circuit simulates the signal produced by a muscle, serving to adjust medical equipment. The circuit...
Pressing S1 by a moment L1 glows up, remaining by a time interval depending on C1. This time...