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.
- 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.
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