I have created a system to plug my studio mic (MXL 990) into my MacBook's 3.5mm headphone jack that consists of the following system:
Mic -> AC Power supply for the mic -> 3-Prong microphone cable to 6mm headphone jack transformer -> 6mm to 3.5mm converter.
The system, however, doesn't work. I have tried diagnosing the problem myself with the following:
- Using a different mic
- Skipping the transformer in the line
- Skipping the AC Power supply in the line
- Hooking up to a different mac, and directly to a speaker.
- Checking the output voltage of the AC power supply