Example logic circuits, live
The circuits every digital logic course builds, each with its truth table, its equations, the 74-series chips that make it — and the circuit itself running in the page, to switch and probe.
- Half adderTwo bits in, a sum and a carry out
- Full adderAdds two bits and a carry — chain them for any width
- 2-to-4 decoderTwo address lines pick one of four outputs
- 2-to-1 multiplexerA select line chooses which input gets through
- 2-bit comparatorGreater than, equal to or less than
- 4-bit parityThe simplest error check, from XOR gates
- Seven-segment decoderThree switches to a digit 0–7, from gates alone
- NAND gate and LEDA first breadboard: a 74LS00 lighting an LED
More in the community
These are LogicsBench's own examples. The community has what people have built and published — open any, try it, and fork a copy to change.