Use a Schmitt trigger. You can buy one of these as an I.C.
A multivibrator produces square or rectangular waveforms.
AC sinewave
Square
The wave with the maximum RMS value, in comparision with the peak value, is the square wave.
A transverse wave can be produced on a stretched string. In this type of wave, the motion of the particles of the medium is perpendicular to the direction of the wave propagation.
transverse wave
A wave is a normal wave and a wave length is the wave Height or distance
A: square wave can be positive and or negative. A digital signal is a square wave but it can be of invariable duty cycles
Frequency waves are produced by a vibrating source, such as a sound wave produced by a vibrating object or an electromagnetic wave produced by an oscillating electric charge. The rate at which the source vibrates determines the frequency of the wave.
Filter the square wave with a low-pass filter sharp enough to remove all frequencies above the frequency of the square wave.
If the wave moves in the same direction as the force that produced it.
A transverve wave