12v 3a Transformerless Power Supply

[uchihahayato]

Please Help me. I need a schematic diagram of a Transformerless Power Supply.

With the following specs.

Vin = 220V AC
Vout = 12V DC
Current Rating = 3 A

Please Please Please  :-\

[Hero999]

No because it's not practical.

Take a typical transformerless power supply circuit:


For 3A@12V C1 would need to be 47uF.

[vendaf]

How about output current that can reach at least 1-1.5A? Is it possible?

[Hero999]

How about output current that can reach at least 1-1.5A?

What do you think?

Is it possible?

I didn't say it's impossible, just that it isn't practical. It's theoretically possible. Do the calculations and you'll see what I'm getting at.

[Mazda]

well

47uf polyster or electrolit

 

[audioguru]

The capacitor will have AC across it, not DC so you cannot use a polarized electrolytic capacitor.

I could not find a film capacitor rated at 47uF/400VAC anywhere. They were available 60 years ago, were very large and very expensive. But transformers are inexpensive and are available everywhere today.