[Boatanchors] My model train transfomer variac idea - comments

[J. Forster]

Henry,

It's a clever idea. I need a 0-150 VDC supply at a few mA and might use it.

-John

================


> There seemed to be a misunderstanding -- the variable low voltage (0-
> about 30 Vac) is fed to
> directly to a separate  filament (or old fashioned door-bell)
> transformer's low voltage/filament secondary winding and will thus produce
> from 0 to >120 Vac (0 to >240 ) at the primary winding, depending on the
> setting of the control arm on the train transformer and the rated voltage
> of the reverse connected transformer's low voltage winding(s).
>
> This not  is a conventional series- connected  few-volt
> bucking/subtractive or additive configuration.
>
> My point is that variacs can be expensive (at least on this side of the
> pond) and this is
> a  cost-free way of controlling low wattage gear if you happen to have one
> of these model train
> units and a filament transformer at hand.
>
> (Some (most?) model train control units supply dc so the ac voltage output
> would have to be tapped
> ahead of the rectifier(s).)
>
> 73,
> Henry OZ1UF / N2NR
>
>
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