How can I test a mini capacitive microphone? I have a mini microphone(something used in telephones) and I want to create a circuit to see how it works? I want to speak to it and see how current or voltage or resistance changes as I speak to it
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do you have an oscilloscope to view the waveforms produced by speech? – Andy aka Feb 15 '14 at 14:12
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Unfortunately not, Is there any other way to see it – Ali.Rashidi Feb 16 '14 at 22:40
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Why did you accept the answer if you can't use an o-scope? – Andy aka Feb 16 '14 at 22:48
2 Answers
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For most cheap capacitive microphones (which include the built-in amplifier, and this is probably your case, as you call it a "mini microphone used in phones") the circuit below should work. Typical Vcc should be +3.3V or +5V (do you have any documentation of your microphone, stating what is the acceptable power supply voltage?).
simulate this circuit – Schematic created using CircuitLab
wzab
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2Some microphones of this type are polarized because a FET transistor included as a preamp. Usually one of the pin is connected with the outer shell. This is the GND. – GR Tech Feb 15 '14 at 16:38
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The simple test of electret microphone - is "blow". Just blow to it and measure the resistance. It should fluctuate near 2kOhm.
Boris N
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