Archive for the ‘LEDs’ Category:

2014-03-29 Nichia NSPB633 Blue Oval LED

I received my package of LED’s in the mail today from goldmine-elec.com. Quantsuff emailed a link to their sale on the Nichia NSPB633 blue oval LED (it might say NPSB, but that’s a typo). They are on sale for 100 for $10. I ordered some and I have been playing around, err, experimenting with them

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2014-01-27 LED Auto Dome Light Is Too Hot

I took apart a “Type R” LED light, which is a substitute for a wedge base auto light used in instrument panels and dome lights.  This light has an 8 mm diameter LED and a 560 ohm, 1/8 watt resistor in the wedge base.  Assuming that the LED drops 3.2 volts and the auto’s battery

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2013-10-27 Low Power Joule Thief With Photocell

One Joule Thief I have not built (at least not in the same JT) is the low power JT with the CdS photocell.  Almost all of my JTs with daylight shutoff used a LED as a light sensing diode, and then most were flashers.  I have a bunch of CdS photocells but I haven’t really

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2013-08-17 Where and Where Not to buy LEDs

Paul discussed buying LEDs and I decided to write about some of my experiences with buying LEDs in this blog. I bought some LED assortments from an eBay seller, I think he’s from Canada.  He’s still selling stuff. Most of the LEDs had bubbles in them.  I dealt with him through email, and I  said

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2013-08-11 Watson’s 21 LED Light Panels

I went to my computer club meeting this Sunday and they had a really good deal on the consignment table that I just couldn’t pass up: three 21 LED panels for five bucks apiece.  They’re built very sturdy, with a body of extruded aluminum and screws holding the end covers in place. The ‘handles’ on

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2013-04-29 Fordex 300 Lumen Flashlight

The LED flashlights I bought in March from Amazon (but shipped from Hong Kong) arrived recently and I’ve had a chance to use them a bit.  I paid $5.49 apiece, with free shipping, but I see that the price (as of June 8) has gone down to $4.30,  These have a Cree Q5 emitter, and

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2013-04-28 LED Current Limiter Using Zener For Reference Voltage

This is an old schematic that I drew in Apr of 2005 using SwitcherCAD III (now LTspice). It is taken from the board I built and put in service for several years as a LED test jig for testing the lifetimes of various white LEDs. Needless to say, most of the white LEDs lasted less

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2013-04-03 Siemens DL 2416T 4 Character LED Display

This is from the 1980s, it’s all red LED segments or dots.  I tried to find an angle where the ceiling light would not show, but because it’s a bubble lens, just about any angle had that white  reflection.  The specifications are available on the ‘net.  The box outlined in red is one of the

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2013-03-03 Latest Few Flashers Built, JTs Too

Paul emailed and said he has built his 12th Joule Thief.  Man, this guy is Helen Wheels – an even dozen in a matter of a fortnight (or week or two, I forget which). I’ve been puttering with the TE Flashers.  I made most of them on small pieces of “Woodsie” wood that I got

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2013-02-28 Website Of A German LED Distributor

I found this LED website in Germany,  I like it because it’s LEDs, LEDs, and more LEDs, and not an electronics parts distributor.  The LEDs are broken down into various types, standard, high power, etc., etc., etc.  I’m looking for a similar website of a store in the U.S.  I figure it would be best

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