Hello Marius, list,

If you only need a few seconds (10-20), you can use the ISD1110 or ISD1420PI-ND (available at digikey.com).

Here's a schematic of it from Diana Burgoyne that made 'diagram of the day' on #dataflow : http://www.artengine.ca/acastonguay/dotd/dotd_IMGP1489_3.jpg

Cheers,

Alexandre