This circuit was found in a 1967 EEE. The transistors are from the time and can be tested equivalent.
This circuit consists of a simple continuity test with two transistors forming a relaxation...
This circuit is a manual of 1972 RCA power transistors. The critical components of the project are...
Found in the 1974 Ferranti transistor manual, this Schmitt trigger circuit uses general-purpose transistors...