Reported Incident Severity Level: MINOR
I am using an early version of Intel-based MacBook. It has a built-in microphone and a webcam suitable for video chat. It also has a headphone jack and an audio input port.
At the online course of the university I took last year required a Skype interview as part of its end of the course test. The lecturer recommended to use a headset instead of the built-in mic and speaker while communication over Skype and I purchased one. During the interview, the lecturer told me that the mic of headset didn't seem working so well but we managed to complete it. I have not been used the headset since then. So I forgot about it.
Recently, I found something was wrong when I tried to record my song in DTM software using the mic of the headset. When I looked into the screen the sound level bar responded but once I sit back in the chair and started singing the bar didn't pick up any signal.
I believed the mic input should be switched from built-in one to headset one, but it was not true. After searched around over the net, I learned that my MacBook's audio input port can't supply power to the headset mic. It is a plain line-in audio port. What I had been thinking as the voice through the headset mic was actually the sound picked by the built-in mic.
I have an old small battery powered mixer which has a plug-in power mic port. So I connected it between the mic jack of the headset and the Mac's line-in port. Then I tested. Still the headset mic didn't work. I thought the mixer was broken and purchased a tiny USB headset adaptor.
It was after I connected the headset to the adopter, I noticed the mic switch of the headset had not turned on. I still need the mixer anyway as MacBook doesn't have a plug-in power mic port but I didn't have to buy the USB headset adaptor.
Actual Incident Severity Level: MODERATE
Root Cause: lack of knowledge/insufficient prior check
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