The JK flip-flop can be used to count in binary!
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You can get all the components used in this video from any online electronic components distributor (Jameco, Digikey, Mouser, etc).
Complete parts list (everything in this video):
- 4x 74LS76 (Dual master-slave JK flip-flops)
- 4x LEDs
- 22 gauge wire
- 5 volt power source (e.g., a USB phone charger)
- Clock circuit from https://youtu.be/kRlSFm519Bo