What is the current drain of a small electret mic similar to this:
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?
What is the current drain of a small electret mic similar to this:
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?
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.
Here is one with a battery inside:
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.
-- Sue
electrets should not draw any power when not plugged in
Phantom power is a 48v signal from your desk
not
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.
You are referring to mics with Plug-In-Power or those with phantom-power. Other mics have the battery inside.
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
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