Turns out, adding in the frequency domain looks like multiplication in the time domain, so we actually want to multiply the two signals together. In general, a good math model for a sine wave is: ...

Using a copy of [SPICE] a free circuit simulation application, I have created several sine wave sources ... of the main frequency called harmonics. When building a square wave only odd harmonics ...

You need to know about these quantities used in waves - what they mean, the symbols used for them and the units used to measure them. Don't get confused with this quantity frequency. It is not a ...