Transformerless Power Supply of 1A at 5Volts!

[Megahertz]

I know some places have extreme voltage drop. Will this circuit work if AC voltage drops to lets say 160V from 230V & also if it rises to Lets say 300V from 230 V? Thanks

[sayzer]

I know some places have extreme voltage drop. Will this circuit work if AC voltage drops to lets say 160V from 230V & also if it rises to Lets say 300V from 230 V? Thanks

In what place of earth can municipal power lines go from 230V to 300V?

I can understand 240 or even at max 260, but 300? Such a case would end up for compensation in court.

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[Ioannis]

The circuit will work from say 10 Volts AC up to whatever the rated voltage of the componets used is, mainly the bridge.

So the answer is yes.

Ioannis

[Archangel]

In what place of earth can municipal power lines go from 230V to 300V?

I can understand 240 or even at max 260, but 300? Such a case would end up for compensation in court.

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Hi Sayzer,
Probably depends upon how you measure it. If you use an a/c voltmeter then it is calibrated in RMS and gives accurate results. If he is using a D/C voltmeter and a diode, then he is seeing peak voltage - diode drop, and will see an inaccurately high value.

[Megahertz]

The country in question is India. When I was there, I actually saw the voltage drop upto 170V and during power faliure when the backup generators were fired up, voltage at few places seem to be as high as 280-300V and so I asked the question just to have the knowledge
Thanks

[Ioannis]

The circuit of Elektor will NOT work when input voltage is rising above 39 or so volts. So it will work perfectly well if input AC voltage is just up to 110. No need to change anything, or almost anything. May be just the R5 changed to a lower value, say 15 ohms.

The circuit is very clever and the SMPS is disabled by the pass transistor wheninput voltage is greater than 39 so volts. Beware it is not isolated.

Ioannis