Re: AppleColor RGB all-red display

[Kevin Dady <kevin@hackaday.com>]

On Oct 19, 4:08 pm, Michael J. Mahon <mjma...@aol.com> wrote:
> Alex Freed <alex_n...@alexfreed.com> wrote:
> > On 10/18/2011 10:41 AM, D Finnigan wrote:
>
> >> I just researched the transistor number, and it appears to be a standard
> >> part: C2688.
>
> >> <http://search.digikey.com/us/en/cat/discrete-semiconductor-products/t...>
>
> > Standard, yes. But not a stocked item. Nothing magical about it: easy to
> > find a substitute. Key parameters are 300V, 10 Watt, 200 mA max current,
> > hFE 40 to 150 and 50 MHz.
>
> >http://alltransistors.com/crsearch.php?mat=Si&struct=npn&pc=10W&ucb=3...
>
> > 81 results found :)
>
> > -Alex.
>
> Wow!  That seems inordinately beefy for a video output transistor. ;-).
> 10W?  And 300v seems like a lot for a transistor stage that only needs to
> drive a CRT grid/cathode...  
>
> Sounds like a significant overdesign.
>
> -michael - NadaNet 3.1 and AppleCrate II:http://home.comcast.net/~mjmahon

they probably got a deal in bulk