if we are using the external microphone jack, does turning off the external microphone allow the internal microphone to record, or do we actually have to unplug it? I presume using the external microphone turns off the internal as well?
I guess it would be easy to check that out by plugging a mini stereo plug in and record a little. It would disappoint me, if it didn't disable the internal mic. Why not just talk with the the external mic off and watch the volume meters?
Scott Chapin Powder Springs, GA, USA Nikonians Team Member
The jacks are "normaled" which means the signal path goes through switch contacts on the jack itself. The normally on connection connects the internal mic to the preamplifier input. When a plug is inserted, that switch contact breaks and connects the preamplifer to the external mic tip and ring and shield. So, the internal mic is disabled when any plug, even a dummy plug is inserted. Stan St Petersburg Russia
and as Stan said any plug will disconnect the internal mic. and knowing this sometimes when I have been taking videos and the ambient noise is not helpful I had a jack that is not connected to anything that I just plug in to the socket and then no sound is recorded. I use that quite a bit in a variety of circumstances. (saves having to post process the sound track out - lazy of me).