Recent comments in /f/todayilearned

rockmsedrik t1_j7lnoor wrote

Blue LEDs have replaced amber tone activity lights in most electronics, and the disturbance to sleep patterns is evident in everyone’s behaviors globally. I have to tape over nearly every LED on every piece of electronics to tone it down enough. Otherwise it illuminates an entire area if the lights are turned off.

Blue LEDs are the scourge to sleep.

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positivecynik t1_j7ln9pe wrote

This is really specifically wild for me to stumble onto here. Let me explain. In the early 90s, a few of us in the clubs were into the whole "cyberpunk" movement that was pretty new back then.

Some club denizens went as far as to create electronic apparel, with an LED or two, and one guy even made a skin temp sensor and connected it to an LED bar graph, so the more he exerted himself the higher his temp would show on his arm.

Anyway.... everyone has either red or green or yellow. I wanted a blue. Couldn't find one.

Internet was pretty limited back then, so a lot of shopping in parts stores, catalogs. Etc....

We finally found a supplier in China that manufactured blue LEDs, but we'd have to buy like 250,000. Somehow this dude gets a hold of exactly 5 of them. He worked a deal with a store who ordered the he quantity and let him buy 5.

Craziest thing, the turn on voltage for the ones We used was 6V. So, strapping 4 AAA batteries somewhere on you would give you 6V.

These blue LEDs from China needed 5V.

Took a while, but we figured out that rechargeable batteries output 1.25V, so we used 4 of those to achieve the 5V turn on voltage. The whole thing took about a year while we figured it out.

Haven't thought about it in 30 years. Then I run across this random article telling me exactly why what I tried to do 30 years ago was so difficult.

/endstorybro

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rks404 t1_j7lev2p wrote

There's another Too Much Joy song that started as a Rod McKuen poem - "Seasons in the Sun" - it was a cover of a song by Terry Jacks

Terry Jacks https://www.youtube.com/watch?v=-tPcc1ftj8E

Too much Joy: https://www.youtube.com/watch?v=mVwU83bsMAM

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Kipsydaisy t1_j7kycjn wrote

Knew a woman in college who gave me a Rod McKuen poem as a sort of courtship gesture. This was late 90's in a college full of mostly English majors. I knew who he was, but barely, and associated him with (figurative) cheese. Think only time he came up after that was when Gene Ween did a whole album of McKuen poems as songs [someone else mentioned].

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