McShamrock
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Let's consider an electret microphone with usually an internal FET with resistor equal to 2KOhm. I am going to bias that microphone with an LDO and a capacitor multiplier. Just connected at the capacitor multiplier I am going to insert a resistor of 1KOhm, the microphone (with internal 2KOhm resistor) and another resistor of 1KOhm connected to ground. The sake is carrying the signal through differential mode.
The vendors give information about the voltage to use for its biasing circuitry, which usually for standard microphone with 3.5mm jack ranges from 1.5V to 10V dc. Should I consider that as the voltage to have at the output of the capacitor multiplier (then applyed to 1K+2K+1K Ohm resistors) or as the voltage to have between the pins of the microphone (2KOhm resistor)?
What do you say if I use a 3.0V LDO (and then the output from the capacitor multiplier is about 2.3V) to bias the microphone? I am going to do that.
Thank you,
N.
The vendors give information about the voltage to use for its biasing circuitry, which usually for standard microphone with 3.5mm jack ranges from 1.5V to 10V dc. Should I consider that as the voltage to have at the output of the capacitor multiplier (then applyed to 1K+2K+1K Ohm resistors) or as the voltage to have between the pins of the microphone (2KOhm resistor)?
What do you say if I use a 3.0V LDO (and then the output from the capacitor multiplier is about 2.3V) to bias the microphone? I am going to do that.
Thank you,
N.
