This circuit was suggested by Texas Instruments in a 1968 publication. The transistors are of the time, and modern equivalents can be used.
The original transistor for this circuit from a 1973 publication is germanium, but a silicon...
This is the project we have described, as found in a 1981 documentation. In the figure we show the...
This circuit is from the 1960 Mullard transistor reference manual. The driver and output...