Hi all,
I just got hold on a "box" to plug at the back of my in car radio, in order to be able to plug an external source. The radio has an inout impedance of 50kOhms while the external source (mp3 player) has 32 Ohms on its output. The "box" I have features a preamp, with a gain of 5 according to the INA2126 datasheet (RGA and RGB are disconnected). Is that gain enough? And mostly, what is(are) the formula(s) to use for that kind of calculations. Having those would allow me to better understand that kind of signal chains. Thanks in advance.
Olivier