Instructables

diy 110v AC screw-in LED lightbulb?

I'm sort of an electronics newbie, but I'm wondering if anyone knows of any designs to make a 110v AC LED screw-in bulb? It seems all you would need is a full wave bridge rectifier, a resistor(?) to lower the voltage, some LEDs, and some variation on a screw-in base to make a home-made LED bulb. Am I wrong, or shouldn't that be relatively simple to build? Any thoughts? Thanks, Matt

Tempest21 year ago
Can you send me instructions
macphreak2 years ago
I have found ebay to be a very good and affordable source for LED bulbs. Only one thing is once I ordered one for 220 volts and need to convert it for 110 but considering the price I may simply order a new one. It was GU10 base with 60 SMT LED's for around 6 including shipping.
JoshuaMkda3 years ago
gt4431b, I've built Led Lightbulb for my own use, with 220VAC for 36, 48 LEDs. I'm not using a transformer, just use 4 diode 1N4007 for convert AC to DC and resistor ( 4 or 6 resistors 2K 2watt), put on an old PCB (from recycle CFL....just clean it). The base I'm also using from old CFL, except the plate for mounting the LEDs, you need to form a circular PCB with certain measurement to fix in the base.
spider_kyle3 years ago
I don't think commercial LED bulbs would have transformers or rectifiers (this is my pure speculation). A transformer would be too large, heavy, and expensive to put in a light bulb, and rectifiers are made of diodes. If you got the right LED and put enough of them in series/parallel, then you wouldn't need the other conventional parts. If you had LED's that could handle the reverse voltage of the AC wave your light itself would be a rectifier. I have no idea if that's how they are actually made (I haven't had the stomach to take apart a LED bulb yet, since they are so expensive), but that would make sense to me.
Big Bwana6 years ago
You could use a Capacitor since they act like a resistor on AC I think 47 uf is the right value, an inrush protecting resistor would also be a good idea in case you turn it on at he top of the cycle (( about a 1 K should work )) now the other half of the cycle the LED would be dark so all you have to do is put another one in reverse so it lights up....
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Would it be possible ot use this with a wall dimmer?
westfw6 years ago
gt4431b7 years ago
matthew6, the light bulbs in my home are forever burning out. It seems that the ones to burn out quickest are the ones that are 20 feet up in tricky corners of the house, and on twisty staircases. Yuck! I want to replace these with LED bulbs, but at $39 per bulb on the market this is highly prohibitive.

My dream is to do this using my old burned out light bulbs. I found this url for hollowing out old light bulbs. I further found this nice diagram explaining how the existing bulb structure might be leveraged to get this working. (I always wondered why it looked like there was only one electrical lead on the light bulb, must have had a sheltered childhood.)

Only question is, would it be possible to fit the transformer and rectifier down into the aperture? I'm a compleat newbie to electronics and electricity, so I don't know what sizes of these would be appropriate to fit into the bulb. I want to learn, though.

If you or anyone else has ideas, I'd love to hear them.
. I can't work with any thing so small, but SMD transformers, bridge rectifiers, &c are all small enough to fit. Maybe you could mount the parts on a narrow PCB and use hot-glue to hold it in place?
NachoMahma7 years ago
. You've got the right idea. You'll need a small transformer to drop the voltage to a reasonable level. I'd use a voltage regulator, but it should work without it. Without the regulator, it should be dimmable, but I can't swear to that.