The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
This car anti-theft circuit is from a Radio Electronics magazine from May 1986. The circuit...
This circuit, well known, since it is already present in other points of this website, is from an...
We found this source with the CI 723, common at the time, in a 1989 paper. Power transistors must be...