M mastero Member Nov 6, 2012 #1 Hello all I am using Sim908 for my project but am getting a lot of noise on the MIC when in an active call. anyidea ? its a electret mic and using the standard design in the data sheet thanx mastero
Hello all I am using Sim908 for my project but am getting a lot of noise on the MIC when in an active call. anyidea ? its a electret mic and using the standard design in the data sheet thanx mastero
audioguru Well-Known Member Most Helpful Member Nov 7, 2012 #3 You forgot to describe the "noise". Is it low frequency mains hum? Is it high frequency hiss from the un-named opamp? Is it background noise? We don't know what is "the standard design in the datasheet." Please post it.
You forgot to describe the "noise". Is it low frequency mains hum? Is it high frequency hiss from the un-named opamp? Is it background noise? We don't know what is "the standard design in the datasheet." Please post it.
unclejed613 Well-Known Member Most Helpful Member Nov 8, 2012 #5 is this being used with a cell phone? if so you need to be using shielded twisted pair. how is this powered? it looks like the power goes through the "differential" line and the audio is on a single wire. the audio wire needs to be shielded as well.
is this being used with a cell phone? if so you need to be using shielded twisted pair. how is this powered? it looks like the power goes through the "differential" line and the audio is on a single wire. the audio wire needs to be shielded as well.