front panel LED help sought
alexandre.tabajara at gmail.com
Wed Jan 14 20:53:41 CST 2015
drlegendre, he will change ALL of the leds, by what he said. So he doesn't
need to worry about how bright they will be. Also, there are hi-bright leds
and lo-bright leds, I believe he will use the least expensive, less bright
ones by default.
On Thu, Jan 15, 2015 at 12:44 AM, drlegendre . <drlegendre at gmail.com> wrote:
> Howdy gents,
> On Wed, Jan 14, 2015 at 3:28 PM, Alexandre Souza <
> alexandre.tabajara at gmail.com> wrote:
> > Jay, leds hasn't changed much from years ago. Electronicaly, i believe
> > led of same size/format/color will fit.
> As one who has recently rebuilt an early 70s Altair 8800, I can inform you
> that a great deal has changed, in the LED world.
> The very inexpensive 'standard' red LEDs which I obtained to replace the
> failed units in the Altair were magnitudes brighter than the original
> parts, when fed from the same power sources. I ended up having to increase
> the value of the series resistors by hundreds or even thousands of ohms,
> just to maintain a similar level of brightness vs. the old LEDs.
> I'd have to take a look inside, but I believe the values jumped from 300R
> to several K in most cases. The new tech is so much more efficient than the
> stuff kicked-out in the 70s!
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