Retrofitting LEDs in a Dynamo Bulb
Intro: Retrofitting LEDs in a Dynamo Bulb
Hello , again ,
As you know there are several instructables on building Bike Lighting systems ,but , hey i wanted to post my own .
After a couple of hours searching instructables ,I haven't saw a proper Bulb-Led conversion , i've just saw some spam or ones with incomplete instructions .
Now i will show you how to retrofit an LED array into a Regular Light bulb , which i think is brighter cleaner , and lotsa times cooler .
As a Bonus i used this LED array in my Bike's Dynamo, Voila, Much more output and half the Power .
As you know there are several instructables on building Bike Lighting systems ,but , hey i wanted to post my own .
After a couple of hours searching instructables ,I haven't saw a proper Bulb-Led conversion , i've just saw some spam or ones with incomplete instructions .
Now i will show you how to retrofit an LED array into a Regular Light bulb , which i think is brighter cleaner , and lotsa times cooler .
As a Bonus i used this LED array in my Bike's Dynamo, Voila, Much more output and half the Power .
STEP 1: Materials 'N' Tools
For my Array I used 3 LEDs but you can use up to 5 (well you can really use more , but there is not enough space...)
The List:
Quantity---------Description
3-5 White Ultra-Bright LEDs (mine were 4900mcd)
1 Used, Burnt or Spare Screw-type Bulb
5-10 CMs(2-5inches)of Small Gauge Wire (mine came from an IDE cable,which is 26AWG)
1 Small Piece of Scrap circuit board (mine had a Dotted design,which is pretty Common)
Tools
-The Usual Soldering Equipment ( Soldering iron , Solder , Helping Hands, Sponge ,Etc)
-Needle or fine tipped Pliers (mine are rusty, That's Why i used my Multi-tool)
-Small Cutters
-A round file
-Hobby knife (i used A hobbico body and a X-acto blade)
-Hot glue and hot glue gun
(Not shown but handy to have )
-A fine tipped Permanent marker
-6 Volt supply and alligator clips
-A Small alligator clip
The List:
Quantity---------Description
3-5 White Ultra-Bright LEDs (mine were 4900mcd)
1 Used, Burnt or Spare Screw-type Bulb
5-10 CMs(2-5inches)of Small Gauge Wire (mine came from an IDE cable,which is 26AWG)
1 Small Piece of Scrap circuit board (mine had a Dotted design,which is pretty Common)
Tools
-The Usual Soldering Equipment ( Soldering iron , Solder , Helping Hands, Sponge ,Etc)
-Needle or fine tipped Pliers (mine are rusty, That's Why i used my Multi-tool)
-Small Cutters
-A round file
-Hobby knife (i used A hobbico body and a X-acto blade)
-Hot glue and hot glue gun
(Not shown but handy to have )
-A fine tipped Permanent marker
-6 Volt supply and alligator clips
-A Small alligator clip
STEP 2: Some Notes About LEDs
(thanks for the suggestions , PKM , Killerjackalope,and AndyGadget)
Our LED array should be Arranged in Parallel , it means LEDs should share positive and Negative Rails .
LEDs are diodes by themselves , so the need for A bridge rectifier is almost unnecesary , yet you
can put one if desired .
The Specs of my LEDs are
Forward Voltage 3.2 - 3.8 Volts
Average Current 25mA
And mcd is 4900
Our LED array should be Arranged in Parallel , it means LEDs should share positive and Negative Rails .
LEDs are diodes by themselves , so the need for A bridge rectifier is almost unnecesary , yet you
can put one if desired .
The Specs of my LEDs are
Forward Voltage 3.2 - 3.8 Volts
Average Current 25mA
And mcd is 4900
STEP 3: Crack That Sucker !
This step can be a little messy and/or Dangerous ,
You've heard right DANGEROUS , i'm not liable if a small shard of glass poke one of your eyes
Remember to remove the solder from the nipple(if it's called like that...)and from the side .
The Safe Method to Remove the old bulb , consist of wrapping the Bulb in A piece of paper and cracking it with the Pliers.
My bulb was loose so it came out by just pulling it gently .
You've heard right DANGEROUS , i'm not liable if a small shard of glass poke one of your eyes
Remember to remove the solder from the nipple(if it's called like that...)and from the side .
The Safe Method to Remove the old bulb , consist of wrapping the Bulb in A piece of paper and cracking it with the Pliers.
My bulb was loose so it came out by just pulling it gently .
STEP 4: Clean That Sucker !
Using the round file , and the X-acto Knife , The result will be a clean inside bulb-less base , (and a small pile of a cement Residue , it is not toxic , but you shouldn't eat or lick it , is nasty!)
STEP 5: Plan Your Array
Figure out how to form a Triangle-like figure (or square or pentagon...) using the LEDs
Then, draw the outline of the base using the Marker ,
And at Last but not at least cut the board trying to adopt the shape of the base as much as you can ,
When done , Dry fit the board and the LEDs
It is pretty Straight-forward , you may also use the pictures as reference
Then, draw the outline of the base using the Marker ,
And at Last but not at least cut the board trying to adopt the shape of the base as much as you can ,
When done , Dry fit the board and the LEDs
It is pretty Straight-forward , you may also use the pictures as reference
STEP 6: Soldering Those LEDs !
I think this is self explanatory , be careful not to burn yourself
Solder all the leads to the board
(in case you Ask , i decided to solder each LED one by one)
Solder all the leads to the board
(in case you Ask , i decided to solder each LED one by one)
STEP 7: Anode With Anode
This step is also Fast
You need to join electrically the three positive leads , just bridge them with solder .
When done, dry fit the array in the bulb base
You need to join electrically the three positive leads , just bridge them with solder .
When done, dry fit the array in the bulb base
STEP 8: Common Anode to Wire
This is when that little wire comes in , cut a small 2.5 cm (1Inch)piece of wire , strip it and tin it with solder , do this same process in the other side.
Now is time to cut off the Leads of the Common Anode .
When Done , solder one of the sides of this little wire to the common Anode(positive) of the Array.
Both Pictures have Photonotes , that can be used as reference
Now is time to cut off the Leads of the Common Anode .
When Done , solder one of the sides of this little wire to the common Anode(positive) of the Array.
Both Pictures have Photonotes , that can be used as reference
STEP 9: Wiring the Ground
This is also an easy step
Clip the cathode leads , Then apply a little bit more of solder
Now , Strip about 1 and a half (1.5)inch of wire , twist it gently , and tin it ,
Proceed to wire all the ground together , making a kind of loop , when done ,
cut the excess wire .
Now is when the PSU comes in , Give the array a try , you know you want to !
Clip the cathode leads , Then apply a little bit more of solder
Now , Strip about 1 and a half (1.5)inch of wire , twist it gently , and tin it ,
Proceed to wire all the ground together , making a kind of loop , when done ,
cut the excess wire .
Now is when the PSU comes in , Give the array a try , you know you want to !
STEP 10: Wirin' It All
This step consists of soldering the Positive wire to the nipple of the base
Then clipping off the excess of wire.
The picture make this step pretty straight-forward
Then clipping off the excess of wire.
The picture make this step pretty straight-forward
STEP 11: Gluin' It Down
Using hot glue (and gun) fill the base with glue , than quickly putting down the
array taking care that the Ground loop touches the body of the base .
let it harden for 15 minutes , and give a final test , Congratulations
You have finished your new LED bulb
array taking care that the Ground loop touches the body of the base .
let it harden for 15 minutes , and give a final test , Congratulations
You have finished your new LED bulb
STEP 12: Final Thoughts , a Note About Resistors and Things That Just Didn't Fit Into Another Step
As you can see this array is reliable , shockproof and it will not burn in a loooooong time ,
I just have a single test Picture since where i live is raining , but believe is as bright (or more!)
than the Original bulb .
Yes , i know that there are several more powerful LEDs in the market , but I was too lazy
to wait 2 weeks of shipping, so i went to my local surplus store and bought them , you may also
salvage the LEDs from a toy or a Chinese flashlight , or better , order them online .
About Resistors :
As most of you know LEDs must have a Current limiting resistor to prevent burning
MATH time , yay!:
5.9 volts of the dynamo minus 3.3 of the LEDs is 2.6
2.6V divided by 0.075A = about 35 ohms (thanks PKM!),the neares safe value is 33
So I just soldered a 1/2 watt 33 ohm resistor in series to the array , I haven't suffered any
disgrace so i think is pretty much OK ,
Resistor color code is orange orange black gold
Anything you need : if you have questions , suggestions , mods feel free to put a comment
or PM me
Thanks , Lots of thanks , for watching ,analising ,doing ,modifying commenting and whatever-ing you
do with this Instructable . Perhaps destroying it ?
If you liked it , please rate or better vote for me in the Let it Glow! contest
Thanks a lot
see you next time
I just have a single test Picture since where i live is raining , but believe is as bright (or more!)
than the Original bulb .
Yes , i know that there are several more powerful LEDs in the market , but I was too lazy
to wait 2 weeks of shipping, so i went to my local surplus store and bought them , you may also
salvage the LEDs from a toy or a Chinese flashlight , or better , order them online .
About Resistors :
As most of you know LEDs must have a Current limiting resistor to prevent burning
MATH time , yay!:
5.9 volts of the dynamo minus 3.3 of the LEDs is 2.6
2.6V divided by 0.075A = about 35 ohms (thanks PKM!),the neares safe value is 33
So I just soldered a 1/2 watt 33 ohm resistor in series to the array , I haven't suffered any
disgrace so i think is pretty much OK ,
Resistor color code is orange orange black gold
Anything you need : if you have questions , suggestions , mods feel free to put a comment
or PM me
Thanks , Lots of thanks , for watching ,analising ,doing ,modifying commenting and whatever-ing you
do with this Instructable . Perhaps destroying it ?
If you liked it , please rate or better vote for me in the Let it Glow! contest
Thanks a lot
see you next time
43 Comments
danbb 15 years ago
acaz93 15 years ago
What I can say from my perspective may not be the Real answer ,
the problem , i'm not quite sure, it's thet the dinamo doesn't produce enough current to light every thing properly , what could be happening ( which i think impossible due to the air flowing around the dynamo ["air friction] )It's that the coils from within the dynamo produce some heat and it affects the energy production , OR the array doesn't properly convert the current to light .
May I ask , is everything connected properly ?
is the resistor in?
how did you made the LED wiring?
luigi2999 15 years ago
danbb 15 years ago
acaz93 15 years ago
SteveMcCraft 15 years ago
acaz93 15 years ago
SteveMcCraft 15 years ago
acaz93 15 years ago
AndyGadget 15 years ago
AndyGadget 15 years ago
fluorescente 15 years ago
slorge 15 years ago
acaz93 15 years ago
acaz93 15 years ago
Patrik 15 years ago
leebryuk 15 years ago
acaz93 15 years ago
acaz93 15 years ago
acaz93 15 years ago