Two choices of write frequency with the Teensy 2.0 - 976.56 Hz and 3921.57 Hz or 490Hz Arduino. I prefer Teensy boards using Teensyduino.
Teensy 3.0 does analog write frequency and resolution. I figure this will permit a wide range of customisation.
analogWriteFrequency(4, 375000); // Teensy 3.0 pin 3 also changes to 375 kHz
analogWriteResolution(12); // analogWrite value 0 to 4095
I'm using an RCD snubber just after the gate followed by an inductor on TEC -ve lead, of course.
I don't want to hijack your thread - strictly amateur stuff.
http://www.iceinspace.com.au/forum/a...e.php?a=149792