by using Lm 567 or other inttegrated circuit (IC)

any site , book,or any thing which can help me to learn circuit anlysis and designing

For highly sensitive electronic designs, u will notice that a push on the push button does not just bridge or unbridge the circuit.There is always very tiny smaller deminishing bounces that follows.
As an electronic engineer or aspiring engineer what type of push ciruit or deboucing switch can be better use.

Electronic engineering student.

can neone provide a link to a circuit which controls oscillations of a pendulum or an oscillator in real life?for example in a mechanical swing.