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How to drop ac voltage without using transformers with using small small components??

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Hello!!! i need your help...

I have to convert the 230V ac to 5V AC or DC...

But without Transformer pls somebody help....

Its urgent..
Is there any way to do so...

Thanks in Advance
 

If the current required is small then look at this one

ww1.microchip.com/downloads/en/appnotes/00954A.pdf
 
Voltage is usually lowered with resistor and internal resistance of unipolar capacitor which doesnt develop heat like resistors. This design is up to 100mA after that you need bigger capacitor, then better use transformer. You can search EDABoard threads recently was several good threads about this topic.


But you can see some examples for higher amperage :

Power-supply-with-LM2575.gif Transformeless 1A at 5V.png 16.jpg


Transformeless Supply Safe & Unsafe.gif
 
Last edited:
arunsharma0731 said:
Hello!!! i need your help...

I have to convert the 230V ac to 5V AC or DC...

But without Transformer pls somebody help....

Its urgent..
Is there any way to do so...

Thanks in Advance
Click to expand...

If your 230 V AC is the power main, then "reducing the AC voltage" without a transformer is VERY DANGEROUS!
The small and low-cost 230V/ 5 V AC transformers are built with a good safety insulation.
You can replace such transformer with capacitors or resistors to get ~5 V AC but the output current is low (several mA) and you can get a good shock by discharging such capacitor.
 

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