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CMOS Toggle Flip Flop Using Push Button
Using Push Button The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button

Single Transistor
Circuit The circuit below requires a double pole, double throw relay in conjunction with a single transistor to allow toggling the relay

Bistable Flip Flop
Here are two examples of bistable flip flops which can be toggled between states with a single push button

Set/Reset Flip Flop
This is an example of a set/reset flip flop using discrete components

Photo Electric Street Light
This is basically a Schmitt Trigger circuit which receives input from a cadmium sulfide photo

Pinewood Derby Finish Line Lamps
The finish line circuit below detects the first of three cars to cross the line and illuminates a 25 watt 120 VAC