Have any of you found when designing audio circuits that deal with microphone and input levels that there is a lot of misleading and sometimes contradictory information out there?
I've discovered lots of articles contradict each other when it comes to altering impedance and level of a line signal to that of a microphone signal!
I've read that line-level ranges from 0.3 to 3 volts, I've also read that it is +4dBu which corresponds to a sine wave of 1.228Vrms, and I've also read that it is -10dBv!
I've read as well that the impedance of line signal is 600 ohm in some articles but 50 kilo ohm in others!
I've also read that microphone level is in the micro-volts range or -30 dBv. And that a typical microphone input should 'see' an impedance of 150 ohm, but others say 3 kilo ohm!
All this doesn't help in my quest to build a D.I.! I just want to know how many turns my transformer should have in order to alter my active bass guitar signal so that it will be suitable for the input of a microphone input on a mixing console!
Any attempt to demystify all this stuff surrounding impedance and level of different signals will be greatly appreciated!
Cheers.
I've discovered lots of articles contradict each other when it comes to altering impedance and level of a line signal to that of a microphone signal!
I've read that line-level ranges from 0.3 to 3 volts, I've also read that it is +4dBu which corresponds to a sine wave of 1.228Vrms, and I've also read that it is -10dBv!
I've read as well that the impedance of line signal is 600 ohm in some articles but 50 kilo ohm in others!
I've also read that microphone level is in the micro-volts range or -30 dBv. And that a typical microphone input should 'see' an impedance of 150 ohm, but others say 3 kilo ohm!
All this doesn't help in my quest to build a D.I.! I just want to know how many turns my transformer should have in order to alter my active bass guitar signal so that it will be suitable for the input of a microphone input on a mixing console!
Any attempt to demystify all this stuff surrounding impedance and level of different signals will be greatly appreciated!
Cheers.