from YouTube video bigclivedotcom about fixing a LED floodlight. Half of the 100 LEDs went dark; he resoldered the LEDs and they all started working. The non-conducting half was not using its half of the 25 mA, so the conducting half was probably running at nearly twice its normal current, or about 25 mA. Hopefully
(Read More…)
On Jan 11, 2010 I connected a Philips candelabra lamp to the AC line and turned it on, and for the last nine years it has been running continually, except for a few days time when the power was out, which might add up to a few days, probably less than a week. I did
(Read More…)
from FB group Building Transistor Radios 2018 Dec 4 Terry Harris I didn’t try to mimic the ALD, I used the FETs for a voltage booster. The typical 5mm LED needs somewhere around 60 mW for Max brightness. If I was powering it with 60 millivolts, it would require over an amp to get the
(Read More…)
from FB group Arduino Projects 2018-11-11 As it is, the 6 ohm resistor has 1 amp going through it. Your LED(s) is dissipating 6.55V times 1 amp or 6.55 watts. The LED is not a linear resistance, the voltage doesn’t go up directly as the current increases. The voltage across the LED will stay at
(Read More…)
From FB comment to Bill Sherman’s candelabra lamps. Bill Sherman Sometimes I wonder what is meant by dimmable. If a LED light uses hundreds of microfarads for the DC filter capacitor, then when the light is dimmed, the long time constant causes it to flash on and off when it is dimmed. So if the
(Read More…)
I’ve had several LED purchases that were LEDs of poor quality, actually factory rejects. The sellers may not have known that the LEDs had “chipped chips” missing a piece, or bubbles or inclusions, but even more commonly, the LED chip is off center so the beam pattern is distorted. I let the sellers know, and
(Read More…)
I was at Daiso, the dollar and a half store where everything is labeled in Japanese. I saw a little gizmo that looks like it runs off batteries, and heats up a fine wire to melt and seal plastic bags. I got to thinking about it after I left without one. A few years ago
(Read More…)
I bought a few dozen 1 watt LEDs when they were on sale last year at Electronic Goldmine. They go on sale periodically, for well under a dollar each in a package of 5. A while back they offered daylight but recently they have all been warm white. These are surface mount, so they are
(Read More…)
It’s been awhile since I blogged this, so I may be saying what I’ve already said before. But I get comments from others about how to make measurements of the LED brightness. A recent one is in the comments of an older blog. Many Joule Thief builders don’t have the minimum tools needed for some
(Read More…)
I talked to a club member about LED lights and how much money they saved in electricity. But he said he stocked up on incandescent lights before they were banned so he could have them for his radio room. He has had problems with LED lights causing RF interference with his radios, so he went
(Read More…)
