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.
This different astable configuration was found in one in a 1974 Ferranti transistor manual....
Found in the December 1974 issue of Radio Electronics, this circuit is similar to the previous one,...
This circuit uses a pressure switch to turn a relay on or off. The supply must be 6 or 12 V...