#10806
LectronFan
Moderator

Hi Michael,

The sawtooth oscillator is often used nowadays as tone generator for musical instruments.

It might also be used to make a PWM oscillator.

Since the sawtooth oscillator has many functions, we will make some experiments with it.

I will give examples of that layer on.

Although our little circuits works nicely, it has some drawbacks. The amplitude is small since we are using the very steep charging time of a capacitor.

Remember that the charging curve of a capacitor is parabolic. I explained this a while ago in another project.

The next disadvantage is that the sawtooth waveform is not quite lineair.

If we would replace the 0,1μF capacitor with a 10μF capacitor, just like in the next setup picture, the oscilloscope shows these artefacts. You clearly see how the slope is not lineair. This is because the capacitor is larger in value and the charging time is different.

Later I will propose here a solution for this problem. No matter which capacitor value we take, the slope will be perfect lineair.

Till later.

Sawtooth not lineair