/diy/ - Do It Yourself

Ok I got a new 3.5mm TRS microphone and there's no continuity between the end two of the three contacts, knowing that the sleeve will be GND. I read that some such mics designed to be used with a computer have the tip for the audio to go through (having a series capacitor of a few µF) and the ring is for the bias voltage to go through (having a series resistor of a few kΩ). If this were the case, then measuring between the tip and ring would give a capacitance in series with a resistance, so I tried to measure both with my DMM but neither gave me anything concrete. Wish I had a proper LCR meter. So I put a 100kΩ resistor in series with the tip, and put my function generator across my ring and the resistor, and put my scope across the resistor. At high frequencies (greater than ~40kHz) I get a constant amplitude across the resistor of about 5-10% that of the input signal, implying that the series resistor is in the realm of 1MΩ. Below that frequency the amplitude drops off sharply. For 1MΩ to have a corner frequency of 40kHz, it needs a capacitance of a few pF, so I'm assuming that it isn't meant to have a connection here in the first place. Anyone want to confirm that this is the correct conclusion?

Now on to my real question. I want to make a circuit that interfaces with a microphone like this one. Previously I had assumed that I'd just be shorting the tip and ring together, or just using a mono jack for all microphones, but if feeding the bias voltage into the audio output pin will impact audio quality I may have to re-think that. So either I just tie the bias to the tip and just tie the audio going to the buffer amplifier to the ring, or I tie both together and just have another cap or something in series with the audio. I already have a mixed bias+audio signal planned for soldering an electret capsule directly to the board, or using with common TRRS headphones.
Any suggestions? Pic related is the sort of circuit I think microphones may have.