AC-LED Night Lamp
Intro: AC-LED Night Lamp
This AC LED Night Lamp is dedicated to my friend and adviser *qs*. Without his help I could not have done it.
This Night Lamp runs on AC and is also a Emergency Light when run on the UPS of your PC. during power cuts.
STEP 1: STEP-1
First of all we will fix the LED's to the Perforated Hard Board.
Fix a row of 5 Blue LED's each on both sides of the Perf Board.
Then fix 6 rows of 5 White LED's in between the rows of Blue LED's
That is in total 10 Blue LED's and 30 White LED's = 40 LED's.
After fixing the LED's to the Perf Board we will wire the Circuit.
Please see the next Photograph for guidance.
STEP 2: STEP-2
WIRING THE CIRCUIT.
Follow the Circuit as per the Diagram, The Circuit diagram is very easy to follow as it shows all the polarity of the LED's clearly.
The step down Transformer is a 220 volts to 12 volts. AC.
Blue and White LED's working voltage is 3.3 volts.
Therefore 12v X 1.4 = 16.8 divided by 3.3 = 5.090 so I have taken 5 LED's per row.
This is as per the calculation of my friend **qs** in his Instructable AC with LED's.
A change over SPDT switch is connected for Night lamp (Blue) and Emergency Light (White)
Care should be taken to keep the POLARITY of the LED's as per the circuit diagram.
STEP 3: STEP-3
See the photograph and solder the LED's as per the circuit diagram mentioned in STEP-2.
STEP 4: STEP-4
Fix the Stepdown Transformer in a Metal Box.
Fix a Wooden batten to the Cover of the metal Box with a up & down JOINT.
Fix the LED Light Assembly to the JOINT with screws.
Connect the output wires to the light assembly.
Fix a 2Pin male plug to the input wire of the Transformer.
Please see Photograph for guidance.
THE NIGHT LAMP PLUS EMERGENCY LIGHT IS READY FOR USE.
STEP 5: STEP-5
Here I have made another AC light using 10 mm Milky White LED's. (see photo)
A Stepdown AC transformer of 220 volts to 18 volts is used.
18v x 1.4 = 25.2 divided by 3.3 = 7.636 so I have used 6 LED's because of 10mm size LED's.
I have used 6 LED's in series and 4 rows of LED's in parallel.
The same Circuit is used but without a changeover switch.
This light unit is very bright and can be used as TV viewing Light and Emergency light.
Cost of the light unit comes to 2US $ in India.
SEE MY ANOTHER INSTRUCTABLE "STADIUM LIGHT"
58 Comments
bethmwl 7 years ago
I'm new to LED and you seem knowledgable. I was wondering; What is UPC you mention in first paragraph? Is there some way to determine the voltage of an LED if I pulled it from and old computer or toy AND does it matter?
prateek.aggarwal.9809 9 years ago
Hi,
Can we use a mobile charger instead of a Transformer? as it also gives DC output.
Whats Say?
gemgroup 9 years ago
Yes u use mobile charger 4 this circuit but u use 2 led in series
if u try i send u a diagram
prateek.aggarwal.9809 9 years ago
Please share the diagram if possible :)
Dipankar 9 years ago
A NOKIA mobile charger Model No. APC-8E
Input ----100-240vots.
Output ----5.3volts at 500 mA
Yes it is possible with a Mobile charger of this type.....
gemgroup 9 years ago
can u glow 20 led's on mobile charger ?
Dipankar 9 years ago
Charge what????? This circuit does not have any battery as it runs on 220VAC and 12 volt DC......
If you want to run it on a mobile charger you will have to change the circuit completely.............
Dipankar 9 years ago
NO
Dipankar 9 years ago
Corrected.....................THANKS.
gemgroup 9 years ago
Correct Diagram is Below
Dipankar 9 years ago
Yes you are correct, I will change it, thank you......
Abirboy 10 years ago
fcat1 12 years ago
From your 10mm LED AC light, with 18VAC (25.2 Vpk), u have 2 parallel sets of (6led x2) connection correct ? Roughly how many more 6x2 led can be parallel added to it ?
What if with household 240VAC, a .22uF & 1K ½W resistor, 7led x2, any limitation of parallel connection ?
By adding one Bridge Rectifier, should be able to filter the flicker effect right ?
Dipankar 12 years ago
you can put up to 30+30 led's on a 500 milli watt 12 volt step down Transformer.
If you put more then 30+30 the light starts to go dim, but it will glow.
satpathi 11 years ago
satpathi
Dipankar 11 years ago
fcat1 12 years ago
The max number of LED can direct connect to household is 240 * 1.4 = 336Vpk 336 / 3.3 (led Vf) = 101 minimum number of LED directly connect to VAC.
1) With lower number of LED, I need a .22uF & 1K ½W Resistor, does this C + R set support, as randomly as 45 + 45 led's ?
2) With this C + R combo, does it support four legged Superflux LED ?
Thanks mate : )
Dipankar 12 years ago
Your calculation is correct but it should be 101+101LED's.
Regarding four legged Superflux LED, I have no idea, never used it.
knektek 14 years ago
Dipankar 14 years ago