The starter circuit shown in the figure was found in an old European documentation. The circuit makes use of an SCR which is still common and the diac can be of any type.
This circuit is from a Radio Electronics from May 1994. In it we have the way to connect three 4017...
In the figure we present an extremely simple circuit of a voltage source regulated by a zener...
We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs...