Soundcard pre-amp for oscilloskop

[classic]

I am looking for a circuit (DIY) to build a preamp for my soundcard and the application of using the soundcard as oscilloscop.

I am looking for:
Input Impedance - high (1 m ohm / 20 pF)
Output impedance - low
Amplification 1 and 10
Voltage protection of input

I have searced the web with zero result so far, does anyone know a link og have a circuit I am alaud to copy / build?

 

[x-pro]

Here is a circuit which may be suitable for your purpose - as your soundcard bandwidth is limited on both ends, it is very simple preamp using a standard TL071 opamp chip. It needs dual rail supply from +/-8 to +/- 15 V.

Cheers

Al