With loudspeakers, an important parameter is the frequency at which their cones resonate. This clever Arduino-based tester ...
This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mVrms and a maximum frequency of up to 100kHz.
The APx585 redefines ease of use for testing devices such as cell phones and MP3 players. It has eight analog audio inputs and eight analog outputs, and it supports eight channels of digitized audio.
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