electret mic bias diystompboxes Re reading my original post I can see that I didn't ask my question as clearly as I could have. I already know how to bias one of these (have been working with them for years) and I don't need a mic pre (have been building those for years too), I just always wondered how much voltage would be optimum for this type of mic, which has been answered. amplifier Electret microphone: selecting a bias resistor ... If you take the supply voltage VCC and subtract the design voltage of the electret insert microphone then divide by the electret's current draw you get the bias resistor in k ohms. It looks something like this 5 volt 2 volt : .5 = 6k resistance. Work it out for your device data. To enable Mic BIAS for your Electret Mic WiMo To enable Mic BIAS for your Electret Mic: Carefully remove the 3 screws holding the housing together. Remove the cover of the housing and this will expose the 2 Pole DIP switch mounted on the Printed Circuit Biasing an electret microphone? edaboard Re: Biasing an electret microphone? The datasheet for the electret mic shows that its sensitivity (and overload level) are reduced when the voltage across the mic is reduced from 2V to 1.5V. it shows RL as 2.2k ohms, Then the 0.5mA mic current in the resistor produces (0.5mA x 2.2k=) 1.1V across the resistor so the supply feeding the 2.2k resistor should be 3.1V minimum. Electret Microphone Amplifier Removing DC bias electronica All is working fine using a consumer 'line level' audio input, however I would like to design an interchangeable input section to the project where I can either use the line level audio input on a 3.5mm jack or the mic input from the Electret Microphone Amplifier and hence the need to un bias the signal so it is similar to the input from the ... Electret Mic "Splitting" | element14 | Experts Simple Electrets are usually biased(powered) by a pull up resistor (about 2.3K for 5V power supplies). If each target input has one of these bias resistors, the electret would have too much bias current (which would reduce volume). Many electrets have a built in FET (still having just 2 leads to the mic) which may be able to handle the extra current.

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