OK, now tell us what the hell they are.

Dear Dr. Dawg,

Sorry for posting something a little obscure. IGBT's or Insulated Gate Bipolar Transistors, are fast acting high power semiconductor switches. The units I have are capable of switching 200 amps at 1200 Volts at a significantly high switching rate. This is what makes it possible to use pulse width modulation to turn the switches off and on really fast to generate a variable alternating current output from a dc source, like a big battery pack.

And if anyone knows how to use the timers directly on a Sanguino, please send me a note.