heat sink for transfomer

[nikhil arora]

how to reduce transformer heating
how to take away heat from the transfomer as we use heatsing for transistors is this possible with transformer

My ckt needs 5.1V@200mA i have used 9Vac transformer 500mA rating on its box i cann't say how much it can deliver.
Now i am drawing only 200mA even though it is heating.

 

[ante1]

Hi,

Yes you can keep the transformer cooler if you bolt it to a metal chassis and put some heatsink compound in between. If it’s a toroide transformer you do it the opposite way, space it from the chassis and install a fan to keep it cool. Before you do any of the above, make sure you are not overloading your transformers ratings.

 

[nikhil arora]

my ckt required only 200mA at 5.1V and transformer rating says 9Vac 500mA

 

[audioguru2]

A very poor quality (cheap) transformer heats too much:
1) If it doesn't have enough turns in its windings then it heats even without a load.
2) If the wire in its windings is too thin then it has too high a resistance which causes heat with a load. Then the voltage will be much higher without a load.

 

[nikhil arora]

i think this is the problem
so how to check the transfomer quality
in my city the quality is poor most of the times
is there any method to check transformer quality

I  tested my ckt without load and even without regulator ckt only transformer was kept on and i observed that 70-80% percentange of heating was due to transformer itself.

 

[audioguru2]

I

 

[nikhil arora]

yes another transformer heat is only 5-10% of the heat of the the first one

but the faulty transformer was still working and giving good voltage even it is short it is possbile.

 

[nikhil arora]

I live in ahmedabad which is in gujarat state
Now can u tell me is there any dealer for maru in my city or near me

 

[faizanbrohi]

Hey why not build your own toriodal transfer , i think it should be easy. anyone knows how to make a toriodal transformer