The figure shows a circuit that shows how to control an optodiac to trigger a triac from the LM3914 gates. The circuit is from an Electronics Now issue from February 1998.
Found in documentation from the 90s, this circuit is based on operational amplifiers of the time....
This oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....
This traditional oscillator uses two complementary transistors to produce low frequency signals....