100v-300v to 11.2v wout transformer improved

163

02:39:24

The top power source is 100 volts, the bottom is 300 volts,  regulated to 11.2 volts,  to power two filament light bulbs and an LED. 

published 12 years ago

faceblast

12 years ago

no isolation though. the zener is the only component holding the output volts down

Voltransistor

12 years ago

True! Do you use two regulator sets, one for positive and one for negative?

pip

12 years ago

It would be instant death no matter how many zeners used. When you consider that the only thing separating you from 2500v is a few microns of silicon that could fail in an instant without warning ?

pip

12 years ago

Think of it in terms of a live wire with something hundreds of times thinner than sellotape over the bare wire and you having to live your day where ever thing you touch depends on this to keep you and your family safe. A little dramatic agreed but would you really trust it ?

pip

12 years ago

Posted this on the wrong circuit I thought I was posting on your other circuit with the 2500v supply. But it holds true hear as well..

pip

12 years ago

And I think the scary part is that some one might build it and use it at their home ! Wow

Voltransistor

12 years ago

Good advice, true! Really transformers are wasting more amperage continuously, but they sure are more safe. Whoever will build one one these circuits in real life are not thinking right. One of the reasons for this app is so you can build something with high voltage and be safe.

pip

12 years ago

A well designed and constructed transformer is over 90% efficient, the only downside is bulk.

pip

12 years ago

Transformers are still used in smp but can be much less bulky because the electronics change the line frequency from 50 or 60hz to ten's of thousands of hz allowing the miniaturisation of the isolation transformer.

Voltransistor

12 years ago

True!! Lol. Do you know the average permeability(u) of a transformer? It has to have a good permeability for higher resistance.

pip

12 years ago

Designing transformers for lower loss requires a larger core, good-quality silicon steel, or even amorphous steel for the core and thicker wire, increasing initial cost so that there is a trade-off between initial cost and running cost, ie efficiency. Unfortunately the race to make them as cheap as possible is often the dominant factor and is often reflected in the transformer run hot and inefficient so there is no average as it varies wildly because of the cost factor. But you can tell if you have a good one, they run cold at idle and Bearley warm under full load.

Voltransistor

12 years ago

Thanks! That's helps. I always wonder how the transformer wires never burn out.

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