# 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

- On a bread board, wire one of the circuits shown above.
- Enable A1, A2 ands A3. Set input range on A1 and A2 to 16V
- Set SQ1 to 500 Hz and WG to 1000 Hz
- Select SQ2 from the WG wave shape
- Shift the traces using the vertical sliders on the left, for better view.

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

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

# Discussion

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