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PostPosted: Wed Sep 11, 2019 4:51 pm 
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Joined: Wed Sep 12, 2018 5:17 pm
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Location: Shawnee, OK
https://www.tubesandmore.com/tech-corne ... g-resistor Found this under Tech Articles at Antique Electronic Supply website. Amplified Parts has the same. Handy for someone like me, :bugeye:

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PostPosted: Wed Sep 11, 2019 7:57 pm 
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Joined: Sat Dec 04, 2010 3:42 pm
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Location: Qualicum Beach, BC
Thanks for the link. It's a handy tool.

It's just using Ohm's law, V=IR, rearranged to find R. That's R=V/I where V is the supply voltage minus the LED voltage drop.

I usually just eyeball it, though, and pick a resistor that gives the brightness I want.


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