VIN Technologies › Labs › Electronic Devices Lab

Diode AND / OR gates

Electronic Devices Lab · free online experiment, runs in your browser with no install or sign-up.

Open this experiment in the circuit simulator

Objective

Build a diode AND gate and a diode OR gate from two inputs and check all four input combinations.

Procedure

  1. Change the input batteries between 0 V and 5 V and run each combination.

Theory

Diode OR: output = highest input − Vd. Diode AND (pull-up resistor): output = lowest input + Vd. Levels are therefore 0.7 V and 4.3 V instead of 0 and 5 V.

Questions to answer

  1. Why can these gates not be cascaded many times?

Components used

3 × Battery / DC source, 2 × Diode 1N4007, Resistor 220 ohm 1/4W

About the model

Ideal wires; component models as listed in the catalogue (no parasitics, no temperature drift). Built without a breadboard so the schematic stays readable.

Open this experiment in the circuit simulator

More Electronic Devices Lab experiments