We found this circuit in the 1990 Motorola Linear Databook. The circuit must use symmetric source and has 10times the voltage gain.
This circuit was found in a 1977 Radio Handbook. Equivalent transistors can be used. The formula...
This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger...
The operational amplifier used in this circuit from a documentation from the 70s is no longer easy...