Found in 1965 Delco Radio documentation, this circuit uses transistors from that era. Modern equivalents can be used. The characteristics of the inductor were not given.
In the figure we have a high stability voltage reference, providing a voltage of 10 V at the...
This circuit is from the National Semiconductor FET Databook. It is possible to shift the phase of a...
This circuit was found in an English magazine from 1978, but it is still current, just change the...