Very high gain transformerless boost converter - is it possible

snipped-for-privacy@gmail.com wrote

....

Agreed, not much work anyways, winding takes a few minutes, have some Ecores ready. At high frequencies the cores can be small. I have those in stock in several sizes. I did an about 60 W just a while back for a push pull piezo driver, 2 MOSFETs,

Inductors are fun. And any RF means inductors anyways.

No, high power (several kW) DC motors are common, example for electric boats Mains voltage generators are common in those what's it callled petrol generators with 240V mains output, bridge rectifier 240 * sqrt(2) = 339.411255 Scrap yard, be done with it, some speed control (not the drug) LOL

add a carbon pile regulator

NT

Mechanical, centrifugal speed control, Edison already used it. No losses.

I had a record player that used that

Overkill. Use 4PDT 12VDC relays and I think you are down to around 50 relays...(2 batteries/relay).

John

calls the Groucho Marx Generator.

What's the wall-plug efficiency of a Van de Graaff?

I think the record player speed regulator was frictional hence lossy.

tion :-)

at Phil

I'd like to see that schematic! I work on both EM and SS equipment and so enjoy all forms of electrical abuse...

John :-#)#

My tractor (TO-20 ferguson) has a governor, I've had it apart but don't really understand what all the springs and levers do.

George H.

Huh, I wonder too. The few I've played with you could hear the motor load down as the thing charged up.

George H.

John Larkin wrote

Yes it was, 78 rpm, also friction from the needle..

My mistake. It was Harpo.

I wonder if there is a variant that doesn't apply so much voltage to the relay contacts.

How about a rotating cam that drives a lot of switch contacts? Or a rotating insulated shaft that drives a lot of generators (stepper motors would work) wired in series.

I'd like to get a bunch of doorknob capacitors, charge them each to

tirsdag den 4. september 2018 kl. 19.51.31 UTC+2 skrev John Larkin:

ution :-)

nk

at Phil

that is basically:

olution :-)

hink

that Phil

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Wiki just doesn't know that with one side grounded it's called the Harpo Marx generator. (Harpo was always my favorite.)

George H.

Yes but against a spring that's wound up that is exactly what is needed. Electric motor not so much...

I could imagine a nearly lossless regulator for a wind-up Victrola, but not with 1930's technology.

Please give us a description.

That was used long before Edison.

You say no losses. How would you implement it in a lossless way in this case?

With the centrifugal control you still need something to convert mechanical position to electrical control. Perhaps there is something other than a carbon pile possible, like moving an iron core to vary reactance to control field current.

NT