The signal voltage from each will now be 500mV. If we unplug one of the signals, we change the loading on the other two and the voltage divider changes. This is okay (as we can add a gain of 3 to the opamp to compensate), as long as we don't unplug one of the signals. With all three plugged in, the contribution of each output will be a maximum of 333mV. This solves the loading issue (now each output sees 3.3k which isn't as bad), but not the voltage dividing issue. the leftmost output will see R1 || (R2 + R3)) One is that in order to keep a low impedance output you need to use low value resistors and this loads each output excessively, plus creates a voltage divider between the outputs.Įach output in the above example would see a 150 ohm load (e.g. A simple passive resistive mixer is basic, but a bad solution for a couple of reasons:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |