I want to know if you know an efficient way to protect a signal conditioning circuit from EMI produced by wixel antenna working near the circuit.
In the picture below you can see my circuit: an opamp (ua741) amplifies an input voltage given from a miniature microphone and condition it (by means of a band pass filter) in order to feed P0_0 of wixel.
The problem is that when wixel is in transmission mode, there is a lot of noise in the signal (really a lot of noise! With oscilloscope I read peaks of about 2Vpp) and I think it appear because my opamp applies to the input signal a gain of 65-75 dB.
Is there a way to reduce this interferences?