Mad Of Science

                       When it comes to the design of fans there hasn’t been much innovation or change for a long time. An electric motor turns some blades which then produces a flow of air. The design is simple, yet effective, and we use such fans in everything from keeping our PC components cool to keeping ourselves cool on a hot summer day.

                     Dyson, most well known for revolutionizing the vacuum cleaner market with its bagless design, has now started another revolution with fans. Its researchers have managed to create a fan that has no blades yet still manages to produce a strong stream of air flow.    

                       Few  days back  while watching Tv  suddenly  I noticed a change in  the picture size. I changed the channel and it remained the same .The problem is horizontal picture size of my Tv , it has shrinked. The vertical size is  fine.

                   Instead of flat ,straight picture ,it turned to be curved one.  It happened frequently  and  I already had a guess about the culprit.

You might have all came across many electric bells using electromagnet ,this is yet another one with slight modification , a home made electric bell.



Materials Required:

1. Gong ( toy car )
   
2. Hammer (battery cover sheet)
   
3. Electromagnet ( Picture tube coil)
   
4. 9 V battery
5. Simple Switch Mechanism.(hanging wire)
   
6. Pole Supporting Hammer ( pen refill)
   

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Recently I came across a washing machine ,the problem was it was not draining the water after spinning. It was an Whirlpool automatic washing machine. I opened the back cover gained access to the drain hose .

Actually draining of water will be actuated by pulling the piston out.It is done by a motor gear assembly ,which pulls the string connected to the drain hose. I pulled the string manually water gushed out immediately. So the problem might be with that drain motor or with the swith which actuates this motor.


After removing the machine completely I found that the small motor gear set has been rusted by water.Some how water has entered and it spoiled everything. I took that motor set and opened its cover.

Inside it was a permanent magnet AC motor ,which runs on 220V 50Hz supply. I carefully removed all the gears and gained access to the motor. I removed that motor and connected it to 220V ,but the motor struggled to spin.

So i found out the problem , It was this faulty motor. Actually rust has developed around the stator which prevented free rotation of the motor. I cleaned and removed the rust, now again the motor spins perfectly.

I carefully assembled the gears back to its position and screwed it to the machine. Now it works perfectly. If still the problem exists , better replace the drain motor.

The Perseids are a prolific meteor shower associated with the comet Swift-Tuttle. The Perseids are so called because the point they appear to come from, called the radiant, lies in the constellation Perseus.

Meteor showers occur when Earth moves through a meteor stream. The stream in this case is called the Perseid cloud and it stretches along the orbit of the Comet Swift-Tuttle. The cloud consists of particles ejected by the comet as it passed by the Sun.




Most of the dust in the cloud today is approximately a thousand years old. However, there is also a relatively young filament of dust in the stream that was pulled off the comet in 1862.


The rate of meteors originating from this filament is much higher than for the older part of the stream. The Perseid meteor shower has been observed for about 2000 years, with the first known information on this meteor shower coming from the Far East. In early medieval Europe, the Perseids came to be known as the "tears of St. Lawrence."

The shower is visible from mid-July each year, with the greatest activity between August 8 and 14, peaking about August 12. During the peak, the rate of meteors reaches 60 or more per hour.

They can be seen all across the sky, but because of the path of Swift-Tuttle's orbit, Perseids are primarily visible in the northern hemisphere.

Troubleshooting Whirlpool Auto sparkle Washing Machine :


The problem with the washing machine was over flowing of water . It has a water level controller with options namely Extra low, low, Medium , High and reset.



High water level is selected for washing more clothes , that is when the tub is full .
But the problem is whenever the water level is selected to High , the starts filling even after the level is reached and it over flows.

This is mainly due to the faulty water level controller shown above or the tube which connects the controller and the water tub. The water inside the tub creates a pressure depending upon the level of water present in the tub .This pressure controls the water level controller .

I resolved this problem by loosening the screw in the water level controller , thereby making it easy to stop water over flowing. The more you loose the screw less the water pressure is required to stop water intake.

In my previous post I shared my experience about my UPS now I have two more devices to share with you all. One thing is Electronic Choke and the other Emergency lamp.

Electronic Fluorescent lamp choke:

I got a tube light with no response ,from one of my customer .His doubt was lightning. I opened the electronic choke and his doubt was right it was affected by lightning. I just had a look at the PCB, line to a small transformer inside was burnt .


I just gave a parallel connection to it using a small bit of wire. I checked each and every component inside and everything works fine. After connecting the choke I switched on and the tube light glows.

Emergency lamp:

Another case was with an emergency lamp which is plugged in while charging and was affected by lightning .


The green light was not glowing that is battery is not charging but it can discharge . The lamp glows with the residue charge present in the battery.

After opening the lamp having a look at the PCB found a hole in the PCB , might have got a severe volt. Fortunately everything was fine I checked each and every component . Now as usual I traced the line and gave a parallel line to the small transformer whose circuit was burnt.


Now i plugged in and switched on the lamp ,the green light glows and the battery is charging . Every thing works fine.

Like many other guys me too very much interested towards electronics and I like troubleshooting them. Here I am going to share some of my experience regarding electronic gadgets affected by lightning .

Normally a device gets affected by lightning when its power chord is just plugged in , doesn't matter its switched on or not, just a plugged chord is enough to get affected by lightning.


First thing I am going to share is about my UPS

UPS:

One night I left my UPS plugged in , but power is switched off . I went to sleep , around midnight I heard a loud bang like how a glass piece dropped down will make shattering sound. I woke up and ran towards my PC and TV thought one of my picture tube would have burst. Luckily both was safe , I happily went to sleep without knowing the whats waiting for me the next day , next morning when I switched on my PC, UPS has no response and at that time I recalled what happened last night.




Opened my UPS, removed PCB board , what I saw was along the border of PCB the ground line was burnt and lost two diodes, which I found later after testing with Multimeter.

I just tracked down the line of PCB and just soldered a piece of wire instead of that line and replaced those diodes. Now it works fine .


I have seen some more devices affected by lightning .In my experience ,when compared to other faults lightning causes PCB burning normally it doesn't spoils any components.

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1. Hunger remains the No.1 cause of death in the world. Aids, Cancer etc. follow. 2. There are 820 million chronically hungry people in the world. 3. 1/3rd of the world’s hungry live in India. 4. 836 million Indians survive on less than Rs. 20 (less than half-a-dollar) a day. 5. Over 20 crore Indians will sleep hungry tonight. 6. 10 million people die every year of chronic hunger and hunger-related diseases. Only eight percent are the victims of hunger caused by high-profile earthquakes, floods, droughts and wars. 7. India has 212 million undernourished people – only marginally below the 215 million estimated for 1990–92. 8. 99% of the 1000 Adivasi households from 40 villages in the two states, who comprised the total sample, experienced chronic hunger (unable to get two square meals, or at least one square meal and one poor/partial meal, on even one day in the week prior to the survey). Almost as many (24.1 per cent) had lived in conditions of semi-starvation during the previous month. 9. Over 7000 Indians die of hunger every day. 10. Over 25 lakh Indians die of hunger every year. 11. Despite substantial improvement in health since independence and a growth rate of 8 percent in recent years, under-nutrition remains a silent emergency in India, with almost 50 percent of Indian children underweight and more than 70 percent of the women and children with serious nutritional deficiencies as anemia. 12. The 1998 – 99 Indian survey shows 57 percent of the children aged 0 – 3 years to be either severely or moderately stunted and/or underweight. 13. During 2006 – 2007, malnutrition contributed to seven million Indian children dying, nearly two million before the age of one. 14. 30% of newborn are of low birth weight, 56% of married women are anaemic and 79% of children age 6-35 months are anaemic. 15. The number of hungry people in India is always more than the number of people below official poverty line (while around 37% of rural households were below the poverty line in 1993-94, 80% of households suffered under nutrition).

Sources :

UN World Food Programme

UN World Health Organization: Global Database on Child Growth and Malnutrition, 2006

UN Food and Agriculture Organization: SOFI 2006 Report

National Commission for Enterprises in the Unorganized Sector (India)

National Family Health Survey 2005 – 06 (NFHS-3) (India)

Centre for Environment and Food Security (India)

Rural 21 (India)