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I have built a tube amplifier and modded it with a line out for headphones based on this article.

I measured the output voltage on the artificial "line out" is peaking around 4-5V. As a reference I also tested what my mp3 player delivers and that is around 500 mV

is it safe to introduce 5 V to my mixer (Behringer Xenyx 502) line in?

the manual specifies that the line ins are "designed to handle typical line level signals". based on this post typical is around 300mV, however it may peak to 3 V

I might have answered my own qustion, but a confirmation would be nice

thanks

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1 Answer 1

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It should be fine. If it's too loud, just turn down the gain in the mixer.

I don't know about the Behringer1 specifically, but most professional audio gear uses ±15 V power rails on its line input and line output circuits, because peak signal levels can readily reach ±12 V or more.

1 The manual states that it can handle +22 dBu, which would be a signal that reaches ±13.8 V peaks. (0 dBu is 0.775 Vrms, multiply this by 1022/20 and then by √2 to convert from RMS to peak for a sine wave.)

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