In general, a good math model for a sine wave is: y=A*sin(ωt+Φ) Let’s dissect what this equation to see what it’s all about. The sine angle is in radians and ω is the frequency in radians.

Using a copy of [SPICE] a free circuit simulation application, I have created several sine wave sources and summed them together. Seen here, the waves combine into a square wave with it looking ...