The following content is from a very old report of a practical assignment I had to do when I was in my 2nd undergraduate year. It can contain a lot of errors. But here it is copied because information in this report might be helpful to students who just start learning about practical oscillator circuits in Electronics subjects.
This report has some figures/text directly taken from IC manufacturer datasheets and also from application notes provided with these ICs.
All the simulations were done using Electronics Workbench V5
In the following experiments I implemented various oscillators and observed their characteristics. My focus was basically on sine wave generation techniques with TL084 QUAD OP-AMP IC and square wave generation using popular 555 IC.