Hello,
I would like to ask how does an additive mixer work?
There must be a non-linear element, but I do not know why.
How is it not sum signals without the non-linear element?

 

Read here: https://en.wikipedia.org/wiki/Electronic_mixer

 

So are resistors used for additive mixing?
So, if I want to add signals, will I put them through the resistors?
And how does mixing work on a semiconductor component, such as a transistor.

 

More on mixing:
http://sound.whsites.net/articles/audio-mixing.htm

 

Hello,

Audio-mixing and RF-mixing are completely different.
In audio-miging the signals are added.
In RF-mixing are the sginals multiplied by a non linear system.
Wich type of mixing are you talking about?

Bertus

 

RF-mixing

 

Hello,

Then have a look at the attached PDF's

Bertus

 

The secret to mixing can be found in the trigonometric identities for the product of two sinusoidal signals of different frequencies.

\(sin A cos B\;=\;\frac{1}{2}sin(A - B)\;+\;\frac{1}{2}sin(A+B)\)

and

\(cos A cosB\;=\;\frac{1}{2}cos(A-B)\;+\;\frac{1}{2}cos(A+B)\)

Multiplication is the nonlinear operation that produces this result.

 

thank you all
Does this mean that the signals are multiplied by additive mixing?
So will the difference and sum component be created

 

thank you all
Does this mean that the signals are multiplied by additive mixing?
So will the difference and sum component be created

No, only a nonlinear operation, e.g. multiplication, will produce frequency components at the sum and difference frequencies.

 

The additive and difference signals are produced and the original signals remain present as well. In a two input mixer there are 4 signals at the output to choose from. The stage it feeds will select for one signal through component choice.

Active mixers can boost a freq and/or block one but the basic principles still apply.