Looking to create an audio recorder coming from either a vehicle based two way radio(flat filtered audio direct wire) or a scanner external speaker jack(3.5mm) and record to an SD card. Would like to have recordings only when audio is detected but would have no problem with the recording being continuous and writing over the old files as SD card would be removed as needed to review audio. Powered by either a direct wire to 12v vehicle system or cigarette plug adapter with no user required interaction on startup. On board date and time persistent from initial programming for audio file naming.
Thanks in advance