Non-inverting amplifier LM324
Electronic

In this project, we're going to make a non-inverting amplifier using the op amplifier. The signal source is the same as we've just used in our last project Inverting amplifier, a phase-shifting CR oscillator that can generate sine wave.

We'll amplify the signal from this oscillator with the non-inverting amplifier and activate the speaker. Gain A of the non-inverting amplifier is expressed by the following formula:

A = (RA + RB) /RA

This means that the gain becomes greater if RB is increased or RA is decreased.

When you've assembled the equipment, turn power ON and press S1, and you'll hear a clear, high-pitched sound coming continuously from the speaker. Again you can send Morse code by pressing S1 intermittently.