Logic gates

Logic gate circuits can perform operations like AND, OR etc. They can be implemented using PN junction diodes for demonstration purpose. A wide range of logic gate ICs are also available.

Objective

Study of logic gates using SQ1 and PV1 as inputs, using TTL logic ICs 7408 and 7432.

Procedure

schematics/gate-or-diode.svg schematics/gate-and-ic.svg

The results for the OR gate made using the diodes is shown below.

pics/gate-or-diode-screen.png

The results for the AND gate made using the IC 7408 is shown below.

pics/gate-and-ic-screen.png

Discussion

The working of the logic gate will be evident from the 3 waveforms. You may shift traces vertically to separate them for clarity.