We found this interesting circuit in a 1969 American documentation. It shows a solution with transistors for limiting surges in an alternating current power line.
In the figure we have the way to simulate an SCR using two complementary general-purpose...
Using a 4001 and a high impedance transducer this circuit generates 40 kHz sound signals set to...
The purpose of this circuit is to supply a direct reference voltage from the power grid. The...