Equivalent transistors can be used in this circuit for automotive applications in the 1980s. The frequency is given by the capacitor and the current of the lamp depends on the LM195 transistor.
We found this conventional circuit with 4017 and 555 in a 1995 documentation. It controls 17 LEDs...
This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and...
We found this circuit in the November 1975 issue of Radio Electronics magazine. It uses a digital...