Target:
Beginners and people who don't know how to use an operational. I refer to μA741 because it was the most popular in the '80, thanks to its bipolar technology and low cost.
Left-top to left-bottom
- Amplifier x2, inverter amplifier x2, mixer
Right-top to right-bottom
- Sawtooth oscillator, comparator, square oscillator
... Wait some seconds to see square wave
