On 7/9/06, Russell McMahon <apptech@paradise.net.nz> wrote:
> > ... from NEC I believe,
>
> ie 2SD882 on your diagram.
>
> > ... I replaced it with a BD437, and the inverter worked , but the
> > transistor got pretty hot
> > (certainly hotter than the original). ...
>
>
> > Here's the schematic, with the original transistor:
> > http://marcansoft.com/subidos/ccfl_inverter.png
>
>
>
> It's not clear why it would be getting hotter as it's not obvious that
> the BD437 is inferior in any important ways. Current gain seems the
> most likely culprit.

2SD882 it's a real switching transistor with a 90Mhz bandwidth while BD437 it's
a 3Mhz one. If you need to know more, then visit a romanian site made
by a guy who knows what he want:

http://www.datasheetcatalog.net/cgi-bin/helo.pl?field=Nume&type=C&text=SD882&producedby=&action=Search

http://www.datasheetcatalog.net/cgi-bin/helo.pl?text=BD437&action=Search

greetings,
Vasile
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