front panel LED help sought
drlegendre at gmail.com
Wed Jan 14 22:08:25 CST 2015
Ah, OK - my mistake!
Sorry, gents.. I wasn't following closely enough, and had the impression
that he was trying to mix old & new LEDs..
Thank you for replying and correcting my misunderstanding(s).
On Wed, Jan 14, 2015 at 9:02 PM, Jay West <jwest at classiccmp.org> wrote:
> Drlegendre wrote...
> 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!
> In my case, I'm not replacing just a few LEDs, I'm replacing every one of
> them. As a result I have a much wider tolerance aesthetically as to the
> brightness. That being said, I don't want to blast the room and hurt my
> eyes looking at them ;)
> The ones I'm going to be looking for have axial leads at least 1.5" long,
> and the bulb diameter is 4.6 or 4.7mm (with the slightly wider collar at
> the bottom). I'm hunting....
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