I am trying to accomplish the following and honestly have very little clue as to how to accomplish it.
Project goal:
Use the speaker (audio/AC) signal from a bluetooth headset to illuminate a single LED when a signal is preset. Preferably pulsing with the signal and possibly with adjustable sensitivity.
Considerations:
Size and power. Physical dimensions need to be as small as possible. Power source needs to be 3V or less, hopefully using button-type cells. Another consideration is that there is now only one good electronics supply house left in town. The easiest way for me to obtain parts in a timely manner is good 'ol Radio Shack.
Intended use:
I have a radar detector audio output connected to a bluetooth transmitter. I use a bluetooth receiver/speaker/mic headset especially designed for motorcycle helmet applications. The speaker volume is considerably louder then most cell phone or audio bluetooth headsets. I would like a visual indicator in the helmet as well. I do not want to attempt to modify any of the internals of the bluetooth transceiver, including tapping it for power. I would like the visual indicator circuit to be self contained for mounting inside the helmet or on the headset connector.
I hope this explains my needs clearly. I can solder, read schematics, and have a solid 12V electrical background. Unfortunately as professional 12V tech I always left the electronics repair and troubleshooting to the bench techs and never gained (or forgot) most basic electronics knowledge.
Any help would be greatly appreciated!