This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current equivalents can be experienced. The graph with the circuit performance is given next to the diagram.
The 4093 or any other NAND gate can be used for the very sensitive configuration of a R-S...
The tone produced by this circuit attract fishes. The circuit is installed into a small can and...
This simple circuit with bipolar transistors is from a 1970s American documentation. The RF...