This cascade circuit was obtained from old Signetics documentation. The circuit makes use of special neon lamps that act as valves. Observe the high supply voltage.
The voltage gain of this circuit is 1,000. This gain is given by the ratio between the 10 M ohm...
This circuit was found in a 1980s documentation. Modern general purpose transistors can be used....
This circuit was found in an ancient American documentation. Used integrated circuits are uncommon...