Tom's website is here:
http://www.hv-obsession.com/
~Alex
On Fri, Oct 31, 2014 at 10:39 AM, David Speck <Dave@xxxxxxxxxxxxxxxx> wrote:
> I just made my first tentative foray into the murky world off SSTCs, with
> the not unexpected release of the "magic smoke" when a MIDI controller got
> stuck on a high pulse rate, before I could turn it off.
>
> The coil is a "Screamer" built by Tom Blitch in 2011. Tom's web site has
> disappeared, but I do have schematics.
>
> The schematic calls for HGTG20N60A4 IGBTs. However, the schematic image
> shows them as having the built-in reverse protection diode, which I think
> would make the actually HGTG20N60A4D units.
>
> I'm pretty sure I can substitute the -D units for those installed, but I
> noted that the manufacturer recommends substituting HGTG30N60A4D units for
> the original IGBTs.
>
> The newer 30N60A4D units have twice the current capability, which might
> let them live a bit longer. The only unfavorable difference I can find on
> the spec sheets is that the turn off time is 38 ns for the 30N60A4D,
> compared with 32 ns for the 20N60A4D chips.
>
> Would the extra 6 ns of turn-off time be expected to make a significant
> difference in operation?
>
> Thanks,
>
> Dave
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