Sunday, October 21, 2007
Friday, October 19, 2007
Friday, July 20, 2007
This lamp use two circuits one is converts AC voltage into DC voltage and second is LEDs circuit. One disadvantage of this circuit is that you can connect more than 20 LEDs in series and parallel combination. It is use as a night lamp or in small room. It’s consume very less power.
2) Low power consumption up to 3 watt.
3) It works continuously.
4) If any there are any changes in main supply that time there is no effect on LED lamp.
This circuit consume very less power than CFL lamp and incandescent lamp. The lamp take 6 hours for battery charger and you get 25 hrs backup. Lamp use for farmer on field and best for rural and urban areas.
Making connection for lamp
You can take component as per given part list and first you should identify polarity of all component and then components mounted on Printed Circuit Board (PCB) as per given circuit diagram. When complete soldering then You can connect LED lamp to one side of switch and another side of switch connect side search light and middle terminal of switch connect to battery positive and charger output. The make connection for charger, output from transformer to separate two wire and this wire connect to separate of two diode and this two diode negative will be combine and connect to switch. The separate one diode connect to one wire of transformer for mains ON.
1) It is operates on 6V (4.5AH) battery.
2) Low power consumption. Consumes up to 1.5watt.
3) It gives backup for 25 hours.
Friday, June 29, 2007
D.B.R.T student made different types of led lamps in Fab lab.
1. Small Torch.
This torch is working on 9 volt DC battery. You can hang this torch on siling.
2. Big Torch
This torch is working on 6 volt DC battery. This torch is very useful to farmer. They can bring this torch in farm at night. Big light works up to 40 hours and small is up to 80 hours.
3. Emergency Lamp.
This lamp is useful for home. It is working 6 volt DC battery. It works up to 35 hours.
This low-cost, general-purpose electronic hearing aid works off 3V DC.
In this circuit, transistor and associated components from the audio signal preamplifier for the acoustic signals picked up by the condenser microphone and converted into corresponding electrical signal. The audio output of this circuit is 10 to 15mW and the quiescent current drain is below 1mA.
Monday, June 18, 2007
Sunday, June 03, 2007
These instructor will take this knowledge to the school they teach and it is exported at 2500 students will be benefited. We would like to thank DST(Department of science & technology) for helping us to spread the knowledge of LED.
We made a pedal power cycle to generate electricity which in turn will charge the battery.
A uniquely designed flywheel was our innovaton.
It is a monowheel cycle and is attached to AC generator with V belt. We converted AC in DC and gave it to 12volt 32Ahr
We are planning to employ this project in tribal areas and Nomads where grid power is not an option as it is unaffordable to tribals and cannot be given to nomads who keep on moving from one place to another.
This mechanism is a big success in a Thane school where 32 children pedal for 15 minutes a day and develop uninterrupted power for their classrooms.
Wednesday, May 30, 2007
Objective of this project is to generate electric power using bio gas.We use oil cakes and cow dung as feed for bio gas and this has worked excellently for our Bio Gas plant.
Idea is to generate electricity locally using dung bio gas.
This is an attempt to develop a model of producing electricity locally on small scale, and consume it within a short distance.
What is bio gas?
Bio gas is a mixture of gases, usually carbon dioxide and methane. It is produce by as a result of anaerobic decomposition of organic matter such as vegetable waste, animal waste. It is produce by a few kind of micro organism.
The active main flammable component is methane. Advantage of methane is that it dose not produce harmful carbon monoxide gas. So it is very good to use it in home.
As compare of with commercially available natural gas, Bio Gas contain a large preparation of carbon dioxide. So it is needed to remove such contain before using Bio Gas in IC engine. Process of filtration is important factor while using Bio Gas in internal combustion engine.
Approximate gases content in Bio Gas :-
- Methane(CH4) - 66.5%
- Carbon Dioxide(CO2) - 30.5%
- O2+N2 - 0.5%
- Humidity - 2.5%
(Source-Wikipedia and Chinese Bio gas manual)
COMPARISON OF CALORIFIC VALUE OF VARIOUS GASES
- Producers gas:-1200kcal/cum
- Landfill gas:-4000-5000kcal/cum
- Bio Gas:- 4500-6000kcal/cum
- Natural Gas:-6800-8000kcal/cum
(Source:- Blogg by Hement Thite)
POTENTIAL BIO GAS PRODUCTION FROM DIFFERENT FEEDSTOCK
Animal Quantity kg/day Bio Gas cum/day
Cattle west 10 0.36
Buffalo 15 0.54
Pigeon 2.25 0.18
Human 0.4 0.028
Chicken 0.18 0.11