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Old 28th February 2007, 01:50 PM   #1
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Default 0.5 Vpp or 1Vpp?

What is the standard voltage of audio input signal?
0.5Vpp or 1Vpp?

Thank you.
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Old 28th February 2007, 09:51 PM   #2
smitten is offline smitten  United Kingdom
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Hi!

Used google for you =)

Consumer audio equipment line levels are rated in dBV, and the most commonly used nominal level for such equipment is −10 dBV, which corresponds to a sine wave of about 0.3162 volts RMS. The absolute reference voltage is 1 VRMS [1]. This reference voltage represents 1 milliwatt at 1000 ohms.

Professional audio equipment line levels are rated in dBu, and the most commonly used nominal level for such equipment is +4 dBu, which corresponds to a sine wave of about 1.228 volts RMS. The absolute reference voltage is 0.775 VRMS. This reference voltage corresponds to 1 mW of power at 600 ohms.

http://en.wikipedia.org/wiki/Line_level

You should try it sometime
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