This circuit is from American documentation from the 70s. This configuration appears in this section obtained from other sources. The signal is sinusoidal determined in amplitude by D1 and D2.
This railroad model circuit was found in a 1960 Sylvania transistor manual. The components are from that...
This circuit samples the current in a load and in case of excessive value it activates a...
We found this circuit in a 2004 documentation. The circuit consists of a standard lamp for testing...