Current drain of typical electret mic?

What is the current drain of a small electret mic similar to this:

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Am thinking of the sort which takes an internal silver oxide battery and is mono.

Would a mic like this draw a current when it is not plugged in and not being used?

Reply to
Sandi
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I do not know of any that use a battery inside; all of those i have seen get power from the instrument (like the stereo mike input on a computer - one side is sound and the other side is the power). In any case,the power is in series from source to mike - meaning if the mike is disconnected, no current would flow.

Reply to
Robert Baer

Here is one with a battery inside:

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Individual designs vary - those that take power from the line clearly do not do so when disconnected. Those with internal batteries typically do take power whenever switched on. A standard, capacitor-coupled amplifier input would not provide a path for the DC power.

Some amplifiers have internal links to provide power for electret microphones, over the microphone lead. Many do not.

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Sue
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23m2

electrets should not draw any power when not plugged in

Phantom power is a 48v signal from your desk

Reply to
Setanta

not

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you are perhaps thinking of computer or camcorder type mics which get operating voltage from the device they are plugged into. there are many types that do require a battery or some other voltage supply.

Reply to
TimPerry

You are referring to mics with Plug-In-Power or those with phantom-power. Other mics have the battery inside.

Reply to
Zak

the batteries in a typical electret mike usually last several years. the draw is so low it is the shelf life of the batteries that matters. they self-discharge internally with time.

-bob

Reply to
bob mcree

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