I searched this 12VDC 2a transformerless power supply,but i was unable to find it...
i found 12vdc 20a supply..
plz post a schematic if possible for 12v 2a supply...

 

Hi,
I'd be glad to help you, but your specs are too vague for me to answer you. Here is some basic information I would need to help you:
--Input Voltage level and whether AC or DC.
--Available input current
--Maximum allowable ripple
--Maximum allowable line and load regulation
I think you are looking for a DC-DC converter, but I need you to confirm that information before I spend my time helping you. Also, tell me what the power supply load is (what will it be powering?).
When you reply with that, I'll answer you with details.

Regards,
Kamran Kazem

 

If you are talking about trying to make a power supply connected to power mains without a transformer, well, I expect this thread to be closed shortly. There is no safe way to make a power supply without using a transformer.

Personally I recommend a wall wart.

 

A DC - DC converter is one thing; a transformerless supply operated from the mains is another. Can the OP clarify?

 

yea....it will be connected to 220VAc Mains...

 

Hello,

A powersupply without a transformer WILL NOT BE SAFE.
The use of a transformer is a MUST.
There are circuits as SMPS that are small, but still use a transformer.

Bertus