Mad Of Electronics

Here u can find some useful tips and links related to troubleshooting electronic appliances

Picture Shrinks In Samsung Colour Tv

Posted by rajascientist Friday, September 25, 2009 0 comments

                       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.

                   I removed the Back cover of my  Tv  and removed the Main IC  VCT  4964F PZF100  carefully by desoldering .

                  Now  I replaced it with new  one , and checked for any other fault. Now I switched on the Tv It works fine .

My Own Idea To Try

Posted by rajascientist Tuesday, September 22, 2009 0 comments

Free Road Side Lighting :
             Have  you ever noticed  a lot of wind energy is produced and wasted , as a vehicle pass by you along the high way. These  wind energy produced throughout the day can be used effectively to generate power. These power can be used for lighting road side lights.

          Placing small wind turbine along  the road will generate power, enough  wind will be produced by vehicle passing by. These turbines can be placed along the road side or at the platform separating two lanes. Thousand of vehicle pass by every day and plenty of artificial wind is produced.

 Wind Turbine For Vehicle:    

               Another idea is placing a small turbine above or at the front of the vehicle . As the vehicle moves these turbines can be used to generate  power ,enough to charge a battery .Once fully charged this can be used to run the car. Alternate  battery can be charged at the same time.Hence a complete electric car  ,without any wastage of time in charging the battery can be obtained.


              For additional power the body of car  can be coated with solar cell.


Posted by rajascientist Tuesday, September 1, 2009 3 comments

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)


When electric current passes through a coil wound on a soft iron core ,iron acts as a temporary magnet. It acts as a magnet until current passes through it. I got this electromagnet from junk TV picture tube, works perfectly.

More the number of turns ,more the applied voltage the strength of electromagnet will increase.

Gong :

Look for it in some toy cars ,or else take some tensile metal .


Do it yourself. I made one out of a battery cover metal sheet.

Simple Switch Mechanism:

It is the switch mechanism which varies from bell to bell. It depends upon creativity of creator. Many types mechanism are available. I have used hanging type switch. Nothing but a simple strip of wire hanging down touching the hammer.

Whenever the hammer is pulled and released , the circuit opens and closes.


A small pole is erected near the electromagnet , bearing spring and holding hammer. I used a pen refill as a pole and a spring around the refill. Which gives the necessary tension to the hammer.

This is how it works . The speed of the hammer can be increased by increasing the power of electromagnet .

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