Comments on: Replacing flashlight bulbs with LEDs

By: Tomi Engdahl

Tomi Engdahl — Mon, 22 Apr 2024 11:35:32 +0000

some battery powered LED applications use battery internal resistance, some have resistance in battery holder and some have LEDs manufactured so that they have specifically high internal resistance.

By: LED Flashers

LED Flashers — Tue, 09 Oct 2018 10:11:09 +0000

I found some amazing LED flashers on this website owned by 911 Custom.

By: 911

911 — Tue, 09 Oct 2018 10:09:24 +0000

Great use of LEDs Wonderful

By: Clifford Thompson

Clifford Thompson — Mon, 20 Jun 2016 09:29:04 +0000

Cool use of LED’s

By: Gess X

Gess X — Tue, 05 Apr 2016 07:05:14 +0000

Huh? What’d you say??? Something about spelling, and it needing testing. Maybe it does. Maybe it doesn’t. One thing is for certain. That being before trying to correct others of their works, written in English, you should learn English yourself. Your statements are difficult, at best, to follow, much less read them in a smooth flowing manner. Perhaps your post is translated. If so the translator needs to learn English.

“Spelling troubles”, would normally be used to indicate someone having trouble spelling. When addressing someone having an article with misspelled words, one would use ‘misspelled’, ‘spelling errors’, or ‘spelling mistakes’, something similar.

“…and I uncover it genuinely bothersome …” Uncover is something one does with a tarp, lid, or a blanket. They uncover it. ‘Uncover’ is not a substitute for ‘find’. You find it ‘really’ bothersome, or ‘rather’ bothersome, but not ‘genuinely’ bothersome

There’s more but that’s a start anyway. Correct or critiquing someone about their spelling is not a place you should be going. At least not until you become more proficient in the language. Have a good day.

By: Tomi Engdahl

Tomi Engdahl — Thu, 31 Dec 2015 09:28:29 +0000

MOSFET-based Joule Thief steps up voltage
http://www.edn.com/design/power-management/4438702/MOSFET-based-Joule-Thief-steps-up-voltage?_mc=NL_EDN_EDT_EDN_today_20151230&cid=NL_EDN_EDT_EDN_today_20151230&elq=7f738f8bd8e44ecc85a1488414cdeec7&elqCampaignId=26246&elqaid=29988&elqat=1&elqTrackId=767134726ee94a6386200427c092c003

A simple blocking oscillator circuit can be used to step up voltage using properties of coil inductance (V = L di/dt).

commonly called a Joule thief.

By: Levi

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By: Raymon Tokita

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By: Tomi Engdahl

Tomi Engdahl — Tue, 23 Oct 2012 08:08:05 +0000

Gadget Freak Case #228: Super LED Flashlight Hits 3,000 Lumens
http://www.designnews.com/author.asp?section_id=1362&doc_id=251425&cid=NL_Newsletters+-+DN+Daily

Fifteen-year-old Gadget Freak John Duffy has put together a powerful LED flashlight.

Duffy’s super LED flashlight runs at almost 30W and 3,000 lumens. By comparison, bright xenon car headlights reach about 1,000 lumens. He says you have to be careful building and using this gadget, because it is powerful enough to blind someone if used up close. He used welding glasses while constructing the flashlight.