I am creating a type of mixer for 2 audio inputs into 1 output so i can use 1 pair of headphones with 2 computers without buying an expensive mixer with a amp
Currently i have 1k 1/2W metal resistors on both left and right input signals and nothing on ground
It works great and i can hear both inputs fine though the headphones but it really needs a amp and isnt usable
My question is: What resistors should i be using so there isnt so much volume loss?
Best Answer
I think you'll need more than just resistors to do what you are describing properly. You should probably go active. You could try a simple summing amplifier like this:
This will invert your signal but you can always add another simple inverting amplifier stage at its output (basically the same thing in this schematic except only using 1 resistor at its input).
You will have less loss this way and you can even apply gain if you want to (determined by Rf/Rin). If you add a potentiometer for each input, you'd have individual volume control for each one. You can add more inputs if you like as well.
Hope this helps!