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https://en.wikipedia.org/wiki/Electronic_circuit

http://what-when-how.com/energy-engineering/electronic-control-systems-basic-energy-engineering/

https://www.lawinsider.com/dictionary/control-circuit

https://www.elprocus.com/simple-electronic-circuits-for-beginners/

https://www.britannica.com/technology/electric-circuit

https://www.bbc.co.uk/bitesize/guides/zrh3p4j/revision/1

https://www.analog.com/en/analog-dialogue/studentzone/studentzone-september-2020.html

https://www.ourpcb.com/start-stop-circuits.html

https://www.automation.com/en-us/articles/2011-1/safety-related-control-systems

https://ece.ncsu.edu/research/pes/