Hello everyone, here's the situation. I recently bought a handheld recorder (Zoom H6 Essential). It has an XLR input with 48V phantom power. I purchased some PUI AOM-5024L-HD-R electret microphones to record ambient sounds. Based on some forum posts(https://www.instructables.com/The-Sound-Sleuthers/), I used a circuit called "Simple P48" to connect the microphones to the XLR input. It works well, and the sound is clear. However, I have some questions and hope someone can help me understand.
When I plug an empty XLR connector into the recorder and turn on the phantom power, I measure a voltage of 48.2V between pins 1 and 3 using a digital multimeter. When I plug in the Simple P48, the voltage between pins 1 and 3 drops to 44V. Why is there a voltage drop? Is it because the internal 6.8k ohm resistors of the phantom power are forming a voltage divider with R1 and the electret microphone? Even more puzzling, when I measure the voltage across the two pins of the electret microphone, it continuously rises from about 6V to 13V.
Why is this voltage continuously changing, and why can the microphone still function normally without being damaged even though the 13V voltage seems to exceed the maximum operating voltage of 10V for the electret microphone?
When I plug an empty XLR connector into the recorder and turn on the phantom power, I measure a voltage of 48.2V between pins 1 and 3 using a digital multimeter. When I plug in the Simple P48, the voltage between pins 1 and 3 drops to 44V. Why is there a voltage drop? Is it because the internal 6.8k ohm resistors of the phantom power are forming a voltage divider with R1 and the electret microphone? Even more puzzling, when I measure the voltage across the two pins of the electret microphone, it continuously rises from about 6V to 13V.
Why is this voltage continuously changing, and why can the microphone still function normally without being damaged even though the 13V voltage seems to exceed the maximum operating voltage of 10V for the electret microphone?