So I'm trying to understand this - my understanding so far is that in most modern audio circuits, input impedances are kept low and output impedances are kept high in order to maximise voltage transfer. Thinking about this has inspired questions in my mind, which I hope someone can help me with:
Question one
When reading things explaining impedance bridging, I often come across a circuit diagram that shows an output impedance in series with a source signal connected to an input impedance in parallel with input terminals. Why the difference? (best guess so far... something to do with Thevenin vs Norton reductions...?)
Question two
If we want a flat response, we want the frequency-dependent part of the impedance to not impact our desired frequency range (ie the audio spectrum). So is part of the answer to how this works something to do with increasing resistance at the input, in order to 'overpower' the reactive parts of the input impedance? (this doesn't feel quite right, as this isn't anything to do with the ratio between output and input impedances, but hopefully someone can tell me where I'm wrong!)
I have more questions, but even the questions get a bit garbled in my head when I try to write them down, so I think I'd better leave it there for now!
Many thanks!
Mark
Question one
When reading things explaining impedance bridging, I often come across a circuit diagram that shows an output impedance in series with a source signal connected to an input impedance in parallel with input terminals. Why the difference? (best guess so far... something to do with Thevenin vs Norton reductions...?)
Question two
If we want a flat response, we want the frequency-dependent part of the impedance to not impact our desired frequency range (ie the audio spectrum). So is part of the answer to how this works something to do with increasing resistance at the input, in order to 'overpower' the reactive parts of the input impedance? (this doesn't feel quite right, as this isn't anything to do with the ratio between output and input impedances, but hopefully someone can tell me where I'm wrong!)
I have more questions, but even the questions get a bit garbled in my head when I try to write them down, so I think I'd better leave it there for now!
Many thanks!
Mark