manipulating electric current wave using electronic components

Hi

If I want the 'electric current wave' to flow in only one direction, then I would a diode. While choosing a diode I would take into consideration several factors such as maximum current flow allowed, maximum power, etc. In the end, electronics is more or less about how to manipulate that 'electric current wave' to do different things. The electronic components help us to use that electric wave in different ways. I hope you get the idea what I'm trying to convey.

Please have a look on the linked below; with focus on the #1:
1: https://img6.imageshack.us/img6/7909/four1.jpg
2: https://img191.imageshack.us/img191/4672/four2e.jpg

Q1: Suppose I want an oscillator which produces, let's say, triangular wave. How would I find it? Could you please provide me a list of oscillators which 'graphically' shows me which oscillator produces what kind of wave?

Q2: Different amplifiers, such as differential amplifier and inverting amplifier, affect the input (or, incoming) electric wave in different ways and we end up with 'affected' or 'amplified' output (or, outgoing) electric wave. Could you please provide me a list which graphically shows how an amplifier (such as op-amp) affect its input wave?

Thank you for your help.

Best wishes
PG

Q1.
We all know that when the constant current source is use to charged/discharge the capacitor, the voltage across capacitor will increase/decrease be linear (ramp up/ramp down in a straight line). This property is use in triangular wave generators.

Q2.
The ideal amplifier only change the magnitude of the waveform. The amplifier in linear region don't change shape of the output signal.
We need to add additional component to be able to change the shape of the output waveform

Hi PG,
There are just 3 types of waves, Square, Sine and triangular. Rest all may be a combination of these. There are hundreds of circuit which produce different wave shapes, which are used for different purposes. I am attaching here just 2 for your reference.

For learning about oscillator circuits visit:
How to build an oscillator circuit - a great resource for How To's from Wikia
Here you can find some Scope images
Thomas Scherrer Crystal Oscillator Circuits
Hope it helps a bit.