https://electronics.stackexchange.com/questions/663623/mcu-input-pin-protection
button ESD Protection Circuits doorbell protection
zener TVS uClamp3301D BAT54S BAV99 1N4148W
https://resources.altium.com/p/beginners-guide-esd-protection-circuit-design-pcbs
https://circuitcellar.com/resources/ee-tips/active-esd-protection-for-microcontrollers-ee-tip/
Active ESD Protection for Microcontrollers (EE Tip #129) - Circuit Cellar
https://uk.rs-online.com/web/content/discovery/ideas-and-advice/push-button-switches-guide
https://www.electroschematics.com/musical-doorbell/
Schematic of the musical doorbell circuit
button doorbell protection Input Protection Circuits diode Isolated
interference - Microcontroller with a long wire for digital input - Electrical Engineering Stack Exchange
https://electronics.stackexchange.com/questions/49824/microcontroller-with-a-long-wire-for-digital-input
protection Protecting MCU digital input with 300m wires - Electrical Engineering Stack Exchange https://electronics.stackexchange.com/questions/607286/protecting-mcu-digital-input-with-300m-wires
https://en.wikipedia.org/wiki/Voltage_spike
SPD Switch charge over switch EMC Filters Surge Protection spikes Electromagnetic pulses
Inductor kickback
Voltage spike ELECTRICAL switch
Resistor-capacitor snubber configuration.
Resistor-capacitor snubber
Resistor-Capacitor (RC) Snubber Design for Power Switches | DigiKey
https://www.digikey.tw/en/articles/resistor-capacitor-rc-snubber-design-for-power-switches
https://www.quora.com/How-does-an-RC-Snubber-circuit-work
https://eepower.com/technical-articles/snubber-network-choices-design-and-evaluation/
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