Audio Input to Arduino

I'm trying to take a line-in 3.5mm audio input into the Arduino. So I can have the arduino run some low-pass/band-pass/high-pass filters to trigger some DMX lights.

And I'm currently following http://interface.khm.de/index.php/lab/experiments/arduino-realtime-audio-processing/

I'm only implementing the bottom left of the diagram (audio in/with DC offset). I've gathered so far that I need a 10uf capacitor, 10k trimpot, 2x 100k resistors and a 4,7nf.

My questions are:

  • What voltage do I need the 10uf capacitor?
  • What is a 4,7nf? I'm assuming it's a capacitor. But whats the two numbers mean?
  • Also does the 4,7nf component not polarized so doesn't matter what way around it goes?

Sorry I'm a bit of a electronics n00b. I haven't done any electronics since GCSE.

?What voltage do I need the 10uf capacitor? ?What is a 4,7nf? I'm assuming it's a capacitor. But whats the two numbers mean? ?Also does the 4,7nf component not polarized so doesn't matter what way around it goes

1) 10V is probably the minimum 2) 4.7nano farad. Yes, it's a capacitor. 3) It isn't polarised, so orientation doesn't matter.

Thank you so much AWOL. So is it right to assume there is no working voltage maximum requirement for the capacitors I buy?

So if I buy a 4.7nf capacitor with a working voltage of 63Vdc, that should work right? http://www.maplin.co.uk/Module.aspx?ModuleNo=12031

Should work fine.

BTW, the "4,7" notation is common in Europe, where the comma is the decimal point.