Other

“this is a 3 digit combination lock with potentiometers, logic gates and differential comparators”
The 74HC10; 74HCT10 is a triple 3-input NAND gate. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.
“this is a 3 digit combination lock with potentiometers, logic gates and differential comparators”