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Author Topic: measuring and displaying -12db on an lcd  (Read 722 times)
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Nova Scotia
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I have a large piece of test equipment that is only being used to test the audio section of a circuit board by injecting a -10db, 1Khz signal into the input and expecting to see -12db on the output. If the output is -12db then the circuit passes the test.
Is there a way to design a circuit using the arduino so I can automate this test? the -10db on the input should be eaily do-able. It's measuring the -12db output that I have no idea on how to tackle.

Mike 
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Left Coast, CA (USA)
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It's measuring the -12db output that I have no idea on how to tackle

Well the simplest way I can think is to take that -12db output audio AC signal and rectify and filter it and measure it with a Arduino analog input pin as a DC voltage proportional to the signals level.

Lefty

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