Binary counter

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    • Astable 555 timer - 8-bit computer clock -...