Tranformer less power supply with 6/12V dc with 500mAmp current

I need a circuit for 5v/12v DC supply from 110/220 AC. The common way is to use a transformer, a bridge and a voltage regulator. I know this way, but it is needed to be done without using transformer because of its weight. The maximum current is 500 mA. A friend told me to use HV capacitors instead of Trans to reduce the AC voltage, the other parts are the same. Is it possible to make this circuit? Is any idea about it? Does anybody know any reference? Thanks in advance.

Dear Patel
I am attaching Hi bright LED light circuit using direct 230V supply without transformer. the only issue is it is live. you need to limit the o/p by suitable zener.
also the circuit should be used in isolated packing, so no one get in touch with 230V.

pl do not use this for any direct handling.

Thanks... Srinivasan,

Please let me know this driver circuit provide 500mA output current or other part is change according to current required?

7uF might work for 220VAC 50Hz but not for 120VAC 60Hz. In fact, if the CircuitLab simulator is to be believed, then increasing the series capacitance enough to get this to work at 120VAC will cause the input voltage to the regulators to exceed their max 34V at 220V. One could included a 32V zener (as shown) but it would need to dissipate around 16W!

Perhaps you could include a switch to remove one of the caps for the 220V case, but I don't see an easy way to make this function at both voltage levels (without external input--such as flipping a switch).

* https://www.circuitlab.com/circuit/4bmfeh/eeweb_xformerlessps02/

BTW: C3 is 2.2 _milli_farads or 2,200 uF and D1 is a 32V optional zener put in place to protect the regulators from spikes, momentary voltage surges and the like -- probably should be a 1W or more.

And let me reiterate that this is a *dangerous circuit* *HIGH VOLTAGE!* *UNISOLATED* *AVOID UNLESS YOU ARE WELL VERSED IN HOW TO HANDLE HIGH VOLTAGES* *BECAUSE THIS IS UNISOLATED, LINE LEVEL VOLTAGES WILL BE PRESENT AT THE "LOW VOLTAGE" OUTPUTS -- VERY DANGEROUS AND LETHAL!!!!!!*

Hi Steve

we will use this circuit in inclose case.
also tack care for same.

Lots of thank for advise and support.

Some like this. Replace the two Zeners (D4) to necessary voltage Zener, to set output voltage.

Hello,

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http://www.resistorguide.com/resistor-capacitance/

Regards