On Thu, Apr 24, 2025 at 08:04 PM, Jules Ryckebusch wrote:
What you want to do is put a small capacitor in series with the capsule. Think of it this way: the capsule itself is a capacitor. If you put the same value capacitor in series with it, the signal developed on the microphone drops in half.
Sorry to contradict you, but it's absolutely untrue.
Putting a capacitor in series with the capsule changes the -3dB LF response. Since the typcal +3dB point is about 10 Hz for an SDC, it would result in identical output in the audio range. Incidentally, it would also increase noise by 6dB.
The three most common ways for decreasing sensitivity are:
- Decreasing the bias voltage
- Adding a capacitor in parallels with the capsule
- Adding a NFB capacitor, for a so-called "charge amp"
