Digital Logic - SR Latch

Introduction: Digital Logic - SR Latch

The SR Latch is a great way to introduce how digital logic works. First you make two NAND Gate which is "Not AND" in logic terms and you can combine them together to make a latch. The way it works is by using the unstable condition to hold the last state or the last pushbutton that was pressed. This introduces memory into the circuit.

Part List

  • Pushbuttons (2)
  • Green LEDs(2)
  • 1,000 Ohm resistors (10)
  • NPN transistors (4)
  • Diodes (6)

How it works

Just press the top pushbutton and the top LED will stay on or press the bottom pushbutton and the bottom LED will stay on.

If you would like to learn more visit RealCircuits.com

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Be the First to Share

    Recommendations

    • Trash to Treasure Contest

      Trash to Treasure Contest
    • Raspberry Pi Contest 2020

      Raspberry Pi Contest 2020
    • Wearables Contest

      Wearables Contest

    Discussions

    This looks like an awesome gadget, I just wish there were more pictures, and more step by steps. Those two things can really help people fully complete your project!