Found in a 1968 publication, this circuit generates signals with the waveforms shown next to the diagram. Modern equivalent transistors can be used.
This squelch is activated by its own noise, acting automatically. It is used in communications...
This was one of the National Semiconductor clock modules very popular in the 70s and 80s. In the...
We found this circuit in an old Radio Electronics. The transistors can be the BC548. The circuit...