Keyboard Encoder Circuit Diagram
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20-Key Matrix Keypad That Uses Four Microcontroller Pins | Jameco
16 keys keyboard encoder circuit using 74C922N | ElecCircuit.com
UNIVERSAL_KEYBOARD_ENCODER - Basic_Circuit - Circuit Diagram - SeekIC.com
MM74C922N-based encoded matrix keypad | Embedded Lab
PS - you would also need to add diodes to the 4017 for protection from
Pc Keyboard Circuit Diagram - Wiring Diagram and Schematics