Archive for the ‘LEDs’ Category:

2019-11-15 Build A LED Tester

Big Clive’s YouTube video Ohhh nooo! After all the trouble Big Clive went to show us how a Joule Thief works, he *digressed* to using a 9V battery for his LED tester! Horrors! 😱😱😱 I built a Joule Thief with a socket like he used for the LED. But the JT must not be left

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2019-09-07 2 LED Lights On One Supply

I got some 10W warm white LEDs, and I have some cool white LED strips and they’re both running in parallel off the same 12V supply. But they’re not the same voltage so I had to do some experimenting. The 10W LED is actually a group of 3 by 3 in series – parallel on

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2019-07-08 BigClive Fixes LED Floodlight With Solder

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

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2019-01-10 The Ninth Anniversary Of The Philips LED Candelabra Lamp

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

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2018-12-04 FETs For Very Low Voltage Joule Thiefs

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

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2018-11-10 LEDs Are Not Linear Resistances

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

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2018-07-30 How Are LED Lights Made Dimmable?

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

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2018-02-14  LED 2nds, Factory Rejects

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

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2016-04-16 Plastic Bag Heat Sealer

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

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2016-04-02 LED Light Ideas For Autos

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

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