Use an accurate DVM and a test tone at 0db/400Hz. If your meter isn't up to measuring low AC voltages then make a simple opamp amplifier (a 741 is fine) of known gain and use the DVM to measure the output of that. Then just divide what you measure by the gain of your opamp circuit to get the level at the input.
Use an accurate DVM and a test tone at 0db/400Hz. If your meter isn't up to measuring low AC voltages then make a simple opamp amplifier (a 741 is fine) of known gain and use the DVM to measure the output of that. Then just divide what you measure by the gain of your opamp circuit to get the level at the input.
What is 0db?Does this mean at full volume?
What is 0db?Does this mean at full volume?
Not necessarily.
You need a test tone that will fully drive the output to max volume which means that at some point it will clip as you turn the volume up.
You can make a test CD or MP3 file using Audacity,
http://www.diyaudio.com/forums/soft...ing-using-audacity-get-you-started-guide.html
To determine when it clips you could use headphones and a series resistor to limit the volume. Clipping is very obvious audibly.
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