This is the application circuit for the TDA991, found in the 1976 Siemens manual.
This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is...
In the figure we have a window detector that uses only a voltage comparator. The circuit can use...
Found in RCA documentation from the 1970s, this circuit is intended for firing thyristors in inverter...