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Gadget Freak Case #230: The Inexpensive Dimmable LED Desk Lamp
11/30/2012

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Andrew Morris designed a dimmable LED driver circuit that is simple and energy efficient. He then installed the circuit into a portable fluorescent lamp.
Andrew Morris designed a dimmable LED driver circuit that is simple and energy efficient. He then installed
the circuit into a portable fluorescent lamp.

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cvandewater
User Rank
Gold
Re: An even simpler LED driver
cvandewater   12/8/2012 12:56:03 PM
NO RATINGS
Hi Andrew,

Yep - born & raised Dutch, but now Californian resident.

Clarification for others not familiar with the term - Elco means Electrolytic Capacitor. I was not aware that it is a typical Dutch expression.

Re: isolated, I referred to the housing, indeed the electronics are "hot" so it is required that it cannot be touched anywhere, including at openings for trimming pots to select sensitivity and timeout of the PIR detector. Unfortunately that are typical locations where (rain)water gets in, causing the demise of the detector. Usually it first starts acting weird, switching the light on and off randomly before finally failing completely.

"geisoleerd" is indeed the Dutch word for "isolated" and essentially means separated, so this can mean either the galvanic isolation from the grid or the protection of a "hot" circuit from touch by a non-conducting enclosure. So a further qualification is needed and I forgot to re-read my typing so I did not catch that my statement was ambiguous.

Most likely you found the same type of rope light that I had a section fail in.

Cadman-LT
User Rank
Platinum
I want one
Cadman-LT   12/10/2012 3:05:12 AM
NO RATINGS
I'd like to have one of those!

armorris
User Rank
Platinum
Re: The lamp is still available
armorris   12/21/2012 12:29:45 PM
NO RATINGS
I just modified the lamp from Amazon. The head is almost identical to the one in the video, but the design of the weight and the ballast coil in the base are different. You have a lot less room to work in the new base, but because the electronics is so simple and produces no heat, I was able to do it. Amazon is currently out of the lamps, but will email me when they come in. I'll keep this blog apprised. Then you can email me for a photo and a layout drawing of the new circuit board.

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