[sdiy] 3340 FET sync

[Neil Johnson]

Hi Finlay,

> The behaviour that I'm seeing from the 3340 is close to how Tony describes.
> The triangle waveform at pin 10 is exactly as described in the datasheet, but the "triangle" across the timing cap at pin 11 is bang on +2V to +6V...

Ok, so in that case you CANNOT short the capacitor to 0V as you are
currently doing.  For this to work you need to recreate the lower
internal threshold voltage and short the capacitor to that, not 0V.

Neil