Using the 2N2646 this circuit was found in a Radio Electronics magazine from July 1968. The transistors are from the time and the lamp can be replaced by a high-power LED in a current version.
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...
This circuit was found in a Popular Electronics from the 90's. The frequencies depend on the...
We show in the figure how to implement the No-AND or NAND logic function using a general-purpose transistor....