I'm planning to build a smart socket like device for which i need to power up my microcontroller from the ac source, so please help me with an ac to dc converter that fits into this small space(Input :220-250V & Output:12V or 5V).

 

you are not telling us anything and asking everything in return. For what we know you don't even know about electronics at all.

What do you seek? High current? Low Noise? High voltage stability? Efficiency?

Either way search for buck converters.

 

I'm planning to build a smart socket like device for which i need to power up my microcontroller from the ac source, so please help me with an ac to dc converter that fits into this small space(Input :220-250V & Output:12V or 5V).

They make these.

 

You need a line powered AC to DC converter such as one of these.

 

Here is an excellent answer to your question:

https://images.search.yahoo.com/sea...-?p=5V+power+supply+schematic&fr=&fr2=piv-web

ak

 

you are not telling us anything and asking everything in return. For what we know you don't even know about electronics at all.

What do you seek? High current? Low Noise? High voltage stability? Efficiency?

Either way search for buck converters.

I need something that fits in that space, with an output current of 500mA and Voltage of 5V or 12V

 

Here is an excellent answer to your question:

https://images.search.yahoo.com/sea...-?p=5V+power+supply+schematic&fr=&fr2=piv-web

ak

Transformer can make the circuit bulky

 

If it doesn't have a transformer it cannot be discussed here, according to the User Agreement for this forum. Transformerless power supplies are just too unsafe, especially for those who want to build them. Have you ever wondered why you don't see transformerless line powered phone chargers?

 

I need something that fits in that space, with an output current of 500mA and Voltage of 5V or 12V

Fits in what space?

No dimension have been given.

Pull the guts out of a USB adapter would be my suggestion being you won't make or find a smaller isolated AC input 5 volt DC output power supply than one of those.

 

If it doesn't have a transformer it cannot be discussed here, according to the User Agreement for this forum. Transformerless power supplies are just too unsafe, especially for those who want to build them. Have you ever wondered why you don't see transformerless line powered phone chargers?

But i dont see any transformers in today's mobile phone chargers

 

Have you looked? Post a photo and we'll tell you which component is the transformer.

ak

 

A very good solution is the one proposed by tcmtech in post #9. You are unlikely to find a smaller, more economical, or better performing solution.

 

But i dont see any transformers in today's mobile phone chargers

The transformers ARE there. But they are much smaller because they handle much higher frequencies - more than a few Kilohertz.

 

If you carefully gut wall warts you can get fairly small switch mode power supplies. The attached one is 5V/700mA. Most are regulated, but some are not. You have to find a way to insulate the PCB from it's new enclosure, as you are still dealing with 120VAC in the input side. I do this frequently.

Ken

 

If you carefully gut wall warts you can get fairly small switch mode power supplies. The attached one is 5V/700mA. Most are regulated, but some are not. You have to find a way to insulate the PCB from it's new enclosure, as you are still dealing with 120VAC in the input side. I do this frequently.

Ken

View attachment 114938

Iam from India and is there any way i can buy such a type of small transformer( with input: 230V and output:12V)

 

How small is "small"?
You still have given us no specifics.

 

How small is "small"?
You still have given us no specifics.

1.5x1.5x1.5cm(approx.)

 

230VAC to12VDC/500mA in 1.5x1.5x1.5cm(approx.)...not going to happen.

Ken

 

230VAC to12VDC/500mA in 1.5x1.5x1.5cm(approx.)...not going to happen.

Ken

Can u specify the smallest dimensions possible

 

i need to power an atmega328 microcontroller with this ac to dc converter