This is a Desk top Emergency light consuming very little current, and gives a very bright light.
It is suitable for places having ELECTRICITY POWER CUTS, such as developing countries and third
world countries. I have used 80 EXTRA BRIGHT white LED's, a 6 volts dry RECHARGEABLE
Lead Acid battery, with an inbuilt battery charger.
A powerfull Emergency torch also can be made by useing the same circuit.
(see photographs of different Models.)
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Step 1: STEP-1
1- Metal Box 5"L x 5"B x 3"H = ONE. ( Can be of any dimension or shape)
2- PVC (Switch Board box) 10"L x 8"B x 2.5"H =ONE.
3- (220v AC to 9vAC) Step down Transformer 9v. 500 ml. Amps. =ONE.
4- Diode IN4007 DC. FIVE..
5- Condenser or Capasitor- 100mfd 25volts. =ONE.
6- Resistors 150 Ohms.=80 PIECES.
7- Resistors 390 Ohms.=ONE piece
8- White Extra bright LED 5mm. =80 PIECES.
9- Red LED (for Charging indicator) =ONE.
10- 7"L x 3/4"B x 1/2"H - Wooden batten. =ONE.
11- Small Metal Hinge. =ONE.
12- On / Off (small) SPST Switch. =ONE.
13- One Meter( 3 FEET) Electrical wire with 2Pin Plug. =ONE.
14- Lead Acid Battery (Dry type) 6 volts 4.5 AmH =ONE
15- Some thin wires for making internal connections.
16- TOOLS :- All types of tools for assembling Electronics circuit.
Step 2: FIXING THE LED's
Take a plane sheet of paper, then draw a graph of 10 by 8 = 80 points.
The spacing is up to you, but see that they are not too close because LED's heat up, 1" by
3/4" gap is OK. Paste this graph with paper gum on to the Cover of the PVC Switchboard Box.
Drill holes with a 5mm drill bit. (size of the LED's) Your LED light Box is ready for wireing.
Clean out the paper graph with a cloth soked in water.
NOTE:- See the Photographs for guidance.
Step 3: WIREING THE LED's
Each of the 80 LED's are soldered with a resistor of 150 ohms to their (-) Negative legs.
The LEDs are wired in parallel so they each should have their own resistor.
Then wire the LED's as shown in the photograph.
After wireing the LED's connect it to the 6 volt battery specified in the part list, to see if they are
all glowing or not. If some of them are NOT glowing then check for loose contact or dry solder.
NOTE:- See the Photographs for guidance.
Step 4: Wireing the Charging Unit Circuit.
Follow the CIRCUIT diagram and assemble the charging unit.
FIVE --D1 to D5 are Diodes. IN4007 DC.
ONE --Condenser 100mfd 25volts.
80 PIECES --Resistors 150 Ohms.
ONE --Resistors 390 Ohms.
ONE --Red LED (for Charging indicator)
The Positive line goes from the BATTERY to the LED panel through a SPST switch.
The charging unit is connected to the battery through a diode to stop back current.
The unit should be connected to the mains only at the time of charging the Battery.
Step 5: Assembling the Stadium Light.
Assembling the Stadium light.
In this photograph you can see how the whole circuit is placed and connected inside the Metal Box of 5" x 5" x 3". The NUMBERS below refer to the PARTS in the photo.
1--This is the leak proof Lead Acid Dry Battery-6 volts 4.5AmH.
2--The on / Off Switch is placed in the front side of the box.
3--The 220v AC to 9v AC Transformer.
4--AC to DC convertor and battery charging supply circuit.
5--The wooden batten covered with PVC tape which supports the LED light box.
6--Wires from the battery going to the LED light box through the on / off switch.
7--The AC mains cord (wire) connected to the AC Transformer.
8-- A metal strip to hold the Battery from moving inside the box.
9-- 3/16" size nut and bolt holding the wooden batten at right angle.
10-- The metal box with all the parts inside.
11--The Red LED Battery charging indicator light .
Step 6: FINISHING TOUCH
This is what the finished product will look like.
A little beautification has been done by sticking radium tapes and a PVC concealed wireing strip
has been screwed all around the LED to protect it.
I hope you like the show of this light.
I have already sold about 160 pieces of different models and sizes of this light.
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