個人覺得Lite mode 就很好用了,以下是簡介: ' S% ]! l5 u# |& y# d' N555 Timer PRO provides an array of design wizards, circuit blocks and information panels that facilitate the use of the 555 timer. Component value calculations for the 555 take into account the supply voltage and timer fabrication (CMOS or Bipolar). A Lite mode acts as freeware; any any time one can regsiter the application and operate in full PRO mode