transformer getting hot

Ok, I didn't understand most of that sentence. Want to try again?

ok ..
i have built an automatic water level controller circuit using 555 using it in bistable mode.I am using a 12 0 12 V 500 mA transformer in this circuit.But the transformer got too hot.The current drawn by the circuit is 60mA. what can i do to cool down the transformer?what may be the probable reason?

I'd hate to suggest something as simple as use of a muffin fan and better ventilating.

Are you sure that your reading the current accurately?

There's something that is making it inefficient. I don't know the engineering of the circuit but maybe it's the frequency that the 555 chip is being run?
Perhaps the transformer needs replacing with a larger value. Is there a feedback issue that might be improved?

There is something wrong with the circuit.

Typical power consumption of a NE555 is 3mA.
Max output current is 200 mA.

The transformer? (power supply) shouldn't be hot at the max values.

I'd suggest donzxn provide more details about the transformer/power supply and the drawing of the circuit.

Maybe you are expecting it to be cooler than transformers usually run. How hot is 'hot'?

If it really is too hot and there is no wiring error, the transformer may be bad.

To test the bad transformer theory, disconnect the secondary connections and power up the primary. If it still gets too hot, it's bad. Normal eddy current losses in the core will make it warm but not hot. If it runs normally after disconnecting the secondary, there is a wiring or component problem in the circuit.

i have tried the test.but it still hot enough.But my problem is that i have buy 7 transformer of that type.but all of them give the same problem.

What transformer is that?

i have used a relay of 12 v and 6 LEDs for indication.that is why the current drawn by the circuit is more. and the transformer is of 12 0 12V center tapped 500mA.
Moreover with no load the transformer gets also hot.

oswal.

how hot means it is difficult to touch for long after 30mins with no load(secondary open).
I have to use the transformer for 24×7 for my circuit(automatic water level controller).Is there any way to cool the transformer,so that the whole circuit will not burn out?

Sounds like a poor quality transformer design (high core losses). I hate throwing out purchased parts too but I think you need to source a better transformer if the heat bothers you. If it gets too hot to hold with just convection cooling, it's a POS.