Potato Cakes
Well-known member
Hello, everyone,
I am using a BA283AM circuit as a summing amp for a project. Since all of the signals will already be unbalanced when they are passively summed before the amp, there will be no transformer between the buss and the make up circuit. I am trying to figure out how to determine the input impedance for the BA283AM circuit and for any other audio schematic that I come across. The input for the BA card being used as a 10uF tantalum capacitor followed by a 2k2 resistor and then it enters the circuit. Is the answer I am looking for 2k2 or do I need to calculate for the capacitor as well? This is probably a seemingly easy thing to do but I have never understood how one goes about finding this value to be able to do the related math.
Thanks!
Paul
I am using a BA283AM circuit as a summing amp for a project. Since all of the signals will already be unbalanced when they are passively summed before the amp, there will be no transformer between the buss and the make up circuit. I am trying to figure out how to determine the input impedance for the BA283AM circuit and for any other audio schematic that I come across. The input for the BA card being used as a 10uF tantalum capacitor followed by a 2k2 resistor and then it enters the circuit. Is the answer I am looking for 2k2 or do I need to calculate for the capacitor as well? This is probably a seemingly easy thing to do but I have never understood how one goes about finding this value to be able to do the related math.
Thanks!
Paul