This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
Found in American documentation from the 90s, this circuit has an input resistance of 100...
This type of configuration, which appears elsewhere in this section, was found in a 1965...
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...