Latching power switch uses momentary-action pushbutton

https://www.electronics-lab.com/49033-2/

Anthony Smith @ edn.com published a push button latching circuit able to control a load with a single push of a button. The circuit in Figure 1 shows how you can use a simple, momentary-action, SPNO (single-pole, normally open) pushbutton switch to latch power to a load. Requiring just a handful of common, garden-variety components, […]