pdf soubor: http://www.google.cz/url?sa=t&rct=j&q=tl%20071%20d atasheet&source=web&cd=2&ved=0CCwQFjAB&url=http%3A %2F%2Fwww.ti.com%2Flit%2Fds%2Fsymlink%2Ftl071.pdf& ei=j5QrT42VFc6M4gSJ-amHDg&usg=AFQjCNEcYTepBFtxZ6YZ SfmYG358q1AFTg&cad=rja