Latching relay (CB25722E)

The figure shows how to connect a relay to obtain the latch effect. The circuit is from an Electronics Now from June 1994.

Voltage Follower MC34071 (CB15298E)
Other operational amplifiers of the same the series, such as the MC34072, MC34074, MC35071,...
High Power Ultraviolet LEDs - Wurth Elektronik
September 2017 - Würth Elektronik High Power Ultraviolet LEDs can be obtained from Mouser...
Magnetic Rhythmic Light (CB16369E)
How about a rhythmic light system that uses only one component? If you think this is impossible, it’s...