Hey guys, I want to build a circuit that sums up a Stereo Signal ( Aux / Phone Voltage ) to a Mono one and afterwards Filter it. I know, how my circuit should look and since i want to power it with a Single Supply, i have to use a coupling capacitor at the input and one at the output of each opamp stage, right?
Audioguru again
sent me this picture in my last Post:
I will be using the method at the bottom right Corner, since my Summing Amplifier circuit looks like that:
I also added a Line out, which shouldnt really be a Problem at all, right?
So if i now use the Method, Audioguru sent me a picture of, I have to use a coupling capacitors between the 10k Ohm resistors behind the Signal channels and the inverting opamp input, right? The opamp i want to use is the TL072 . It has got an extremely high Input impedance in the height of Gigaohms or even Tera ohms, if i remember correctly, so i dont have to look at this when choosing the Capacitor.
I saw a formula at a website that describes, how to choose that capacitor, but i have to know the input impedance of the Circuit. The formula then is:
C=1/2_3.14_f *Xc ( I dont know what "_" should mean, please explain if you know )
What is the input Impedance of that Circuit, i want to design?
That's just for the first, i will come to my other Questions after i understood This.
Thank you in advance,
Greetings
Audioguru again
sent me this picture in my last Post:
I will be using the method at the bottom right Corner, since my Summing Amplifier circuit looks like that:
I also added a Line out, which shouldnt really be a Problem at all, right?
So if i now use the Method, Audioguru sent me a picture of, I have to use a coupling capacitors between the 10k Ohm resistors behind the Signal channels and the inverting opamp input, right? The opamp i want to use is the TL072 . It has got an extremely high Input impedance in the height of Gigaohms or even Tera ohms, if i remember correctly, so i dont have to look at this when choosing the Capacitor.
I saw a formula at a website that describes, how to choose that capacitor, but i have to know the input impedance of the Circuit. The formula then is:
C=1/2_3.14_f *Xc ( I dont know what "_" should mean, please explain if you know )
What is the input Impedance of that Circuit, i want to design?
That's just for the first, i will come to my other Questions after i understood This.
Thank you in advance,
Greetings