230v AC to 0-12v DC

605

15:13:30

SMPS circuit without transformer, while testing in breadboard plz use X rated capacitor in 230v supply and 470ohm 1 watt

published 9 years ago

hurz

9 years ago

Almost everything is going wrong here! Your description does not even come to close to the circuit. What you publish here is dangerous!

raufmalik

9 years ago

Nice

ilzul12

9 years ago

That "voltage regulator" will only lit 4 leds or maybe more. At higher load it will blow.

justinmh

9 years ago

Why do you have the potentiometer scoped? And why the rc circuit off to the left?

rich11292000

9 years ago

The rc is part of the transformerless conversion. The capacitor is supposed to obtain the voltage drop rather than the resistor.

justinmh

9 years ago

I see, so rather than stepping down the voltage through a transformer it is stepped down through the resistor and "burned off" as heat.

rich11292000

9 years ago

No stepped down through the capacitor instead, this circuit is improper. Look up 'transformerless power supply'. Learn the rules of what to do, and most importantly what NOT to do.

justinmh

9 years ago

So looks like the resistor and capacitor should be in series and not in parallel, also they should be connected to the top part of the full wave bridge rectifier as the input, and the rectifier and rest of the circuit rewired accordingly. Is this correct rich?

BillyT

9 years ago

You might get away with a 100w 470ohm resistor.

rich11292000

9 years ago

Look up transformerless power supply

justinmh

9 years ago

I did rich, and from what I found it looks like the resistor and capacitor should be in series, and the whole thing needs to be rewired. Am I correct? If not what needs to be done? Elaborate rather than saying just google it.

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