Line out to mic level adapter

[toto83]

Hello there,
I made a preamp circuit which is functionnal using one of the two amps of a TL082 amp.
It outputs a line level of +4dBu, about 1.730Vpeak.
I would like to connect it to a PC mic IN, which means (if I am not wrong) that I need a -50dB attenuator.
Can I build such attenuator from the op-amp?
Thank you for your help
Tom

[Paul Price]

Just use two resistors to make a voltage divider, that's all you need.

[toto83]

Is there any formula to go from attenuation to resistor?

[DimitriP]

Resistor values for attenuator calculator

http://www.nu9n.com/tpad-calculator.html

[tooki]

Hello there,
I made a preamp circuit which is functionnal using one of the two amps of a TL082 amp.
It outputs a line level of +4dBu, about 1.730Vpeak.
I would like to connect it to a PC mic IN, which means (if I am not wrong) that I need a -50dB attenuator.
Can I build such attenuator from the op-amp?
Thank you for your help
Tom

First, check if the PC’s sound settings let you switch the input to line-level; most do, right in software.