On Apr 8, 2006, at 11:51 PM, Peter Chadwick wrote:
> Rich said:
>
> >Motor vehicles are beginning to go to higher battery potentials to
> save on Cu expense and
> on vehicle weight,<
>
> Do you remember 6 volt electrical systems in cars?
I owned a 1963 VW bus that was 6v. Going mobile was an ordeal.
A few years thereafter, when VW realized that they needed to up the
voltage, a number of their engineers argued for 24v, but management
knew better and went for 12v.
>
> Kilovac at one time in their publicity had a whole load of stuff about
> the vacuum conactors
Contactor -- a largish relay
> used to switch th 270 volt DC bus used on the F22. The elctrical
> requirements there must be pretty big - sobering thought, at the
> outbreak of WW2, the standard power source for RAF medium and heavy
> bombers was an engine driven generator giving 500 watts at 24 volts.
> They soon found this inadequate.
The amount of Cu wasted wiring 24v airplanes during WW-2 is impressive.
At one point, Cu was in such short supply that GE started using #14
silver to build the 25uH roller coil used in the BC-375 transmitter.
>
> Diodes speed for protecting the VMOS - I don't know. 1N4008 wouldn't
> do it, 1N4148 was fast enough but couldn't handle much power. I
> suspect some of the fast diodes around these days would do.
thanx, Peter, and Dv/Dt could be slowed down with a suitable C.
>
>
> 73
>
> Peter G3RZP
Rich Measures, 805.386.3734, AG6K, www.somis.org
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