An effective solution to the "racing" problem described in my previous video (<a href="https://youtu.be/st3mUEub99E" target="_blank" rel="nofollow">https://youtu.be/st3mUEub99E</a>) is the master-slave JK flip-flop which comprises two SR latches. In this video I explain how it works, build, and test it.<br /><br />Support me on Patreon: <a href="https://www.patreon.com/beneater" target="_blank" rel="nofollow">https://www.patreon.com/beneater</a><br /><br />You can get all the components used in this video from any online electronic components distributor (Jameco, Digikey, Mouser, etc).<br /><br />Complete parts list (everything in this video):<br />- 1x 74LS02 (Quad 2-input NOR gate)<br />- 1x 74LS11 (Triple 3-input AND gate)<br />- 1x 74LS08 (Quad 2-input AND gate)<br />- 1x 74LS04 (Hex inverter)<br />- 4x LEDs<br />- 2x Momentary "Microtivity 6mm tact switch"<br />- 2x 1KΩ resistors<br />- 22 gauge wire<br />- 5 volt power source (e.g., a USB phone charger)<br />- Clock circuit from <a href="https://youtu.be/kRlSFm519Bo" target="_blank" rel="nofollow">https://youtu.be/kRlSFm519Bo</a><br />...<br /><a href="https://www.youtube.com/watch?v=rXHSB5w7CyE" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=rXHSB5w7CyE</a>