Making recorder/ voice logger system

rahulkumar

New member
Hi
I’m using the Teensy 4.1 along with the Audio Shield Rev D to record audio to an SD card. My goal is to capture audio from another device by tapping into its speaker-level output (speaker+ and speaker-).
Can I safely connect these speaker outputs directly to the shield’s line-in port, or would I need an attenuator or isolation circuit?
 
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