/fa/ - Fashion

>>15086705
Proper cable shielding and placement is really important to avoid noise that obscures the weaker parts of the signal. For instance, in this diagram, the amplified microphone is being driven off of a DC signal generator that was letting some 132KHz noise leak through, presumably from some switching power supply on the same circuit. The signal cable from the microphone to the scope also formed a large loop antenna, introducing RF-range noise, as well as crossing over a mains cable, introducing 60Hz noise. Both of these resulted in a significantly worse signal.