I have designed this audio multiplexer
This is a 4 input TRRS audio switcher. Remember TRRS (4 pins: mic, left, right and ground).
I press a button and I change the input that I want to send to the output.
This switch is supposedly to work as a "universal" switch for all kinds of inputs and outputs.
Unless I connect the output of this circuit to a pre-amp, the output will always be a headphone.
But this is my problem:
Apple earbuds are 23 ohms, Audio-Technica ATH-M50 is 38 ohms, Sony MDR7506 studio headphone is 63 ohms and more pro headphones have higher impedances.
How do I deal with this?
Suppose this switcher were created with a rotary mechanical switch. Then, the input that I select would be directed to the output. So the impedance of the device at the input of my circuit would be "passed" to the output. End of story.
But this is digital. Is the behavior the same? Should I do something or let this the way I have designed and simply add a pre-amp before the output to amplify any signal that is too low?