3-Input NAND Gate
NAND - Not AND. This gate uses 1 transistor per input and only outputs a 0 when ALL inputs are a 1. This is a 3-input variant.
Symbol

Truth Table
| A | B | C | A NAND B NAND C |
|---|---|---|---|
| 0 | 0 | 0 | 1 |
| 0 | 0 | 1 | 1 |
| 0 | 1 | 0 | 1 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 1 |
| 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 0 |
Transistor Schematic

Breadboard Image
