Is this a practical HV supply?

[lineup]

I think I prefer starting with high voltage.
Then regulate down and filter.

To start with low voltage and generate higher is a lot more tricky.
And will often limit the power you can generate in an easy way.

There are special transformers in a wellsorted audio/valve internet shops.
Intended for TUBE circuits, in the first place.
But also to isolate AC MAINS from the power supply.

230VAC in - 2 x 115 VAC out. And similar higher secondaries.
Take your pick if you want to rectify
at 230x1.4 VDC or 1.4 x 115 VDC (parallell secondary)
----

Another trick is to use two standard transformers.
For example two 230 VAC in - 2 x 24 VAC out

and them you connect them
Mains-> 230VAC:48VAC ---> 48VAC:230VAC -> output
and so you have 230x1.4 VDC after rectifier bridge.

By using, combining one 230-2x24 and one 230-2x18VAC
you can get other output than 230 VAC


/lineup advice on transformer tricks

[keantoken]

I have a transformer like the ones you describe, but I don't want to mess with mains wiring just yet.

I would rather build a boost circuit, which should be less dangerous.

I will need heatshrink tubing before I start messing with mains wiring.

I had a boostup circuit on the simulator that was working well, but I still had some kinks to work out. I will have to remake it, because LTSpice saved a blank file - which it does when you have run out of disk space because of all the .raw files for your simulation data.

- keantoken

[lineup]

Well, if you are able, you do it your way
.. I do it my better way.
Anyway I cant stop you
Even if I really want to .. this time only, keantoken
----

Yes, it has happened for me. too .. several times
when I loose my MultiSim work because the program is out of memory.
Best thing then, is to as quickly as possible try to re-create your circuit
.. while is fresh in your mind & more Human Memory

regars
your lineup

[keantoken]

I'm not saying I like my way better, Lineup.

It's just that I would rather not mess with dangerous mains wiring yet. For now, I'm content to use another method.

In truth, I would rather use a HV transformer instead of using a booster, because it's simpler and less noisy.

- keantoken

[lineup]

Why is one high voltage more dangerous than another.

What you are up against is introducing some oscillation
to create, build up some current injections into coils.

Such other higher frequencies we usually avoid inside a box for Audio.
One reason to keep computers and amplfiers seperate.

There are exceptions to this.
Like in the Class-D amplifiers around today.



One common place to find voltage boosters, is in Car Power supplies.
They need it for to get more voltage/power into them 4 Ohms speakers.

Have you looked into these forums, Searched:
- Class-D digital amps
- Car Audio

[Minion]

Originally posted by lineup
Why is one high voltage more dangerous than another.

[/B]

I would gues the differance between a High Voltage high current transformer and a High Voltage Low current switching supply is well , the high current, which at these Voltages is pretty lethal .....

I"ve used the Back 2 Back 12v Transformer method for tube supplies and it works pretty well and its pretty safe if you are carefull....

Cheers

[lineup]

It is the current that paralyses takes out heart/brain.
True.
Otherwise we would be all dead .. by static electricity.
Even stroking a cat would put your life at riscue

On the other hand .. we need voltage to produce currents.
Which means, that if the conductance is high enough and the resistence is low enough
than any voltage can kill you .. if you are in bad luck some fine day.