This Schmitt trigger was found in old documentation. The transistors can be of the general-purpose type like BC548 or even 2N2222.
The circuit in the figure is suggested by Linear Technologies (www.linear.com) and consists of a...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...
We found this circuit in a 1965 General Electric manual. The circuit applies to incandescent lamps only and...