> --- In Walter Knapp <> wrote:
>....
> A circuit could be built, but it would be complex, not a single
> component. And it can all be avoided by simply making it removable
>and
> standard.
>
>There is a simple one component, current limiting device. It is
>called a light bulb. It does assume you have an appropriate dc
>supply and just put the appropriate wattage bulb in series. When
>current is high the light is bright and that drops the current. When
>current is low the light is dim and does not.
>
There is another single component which gives better regulation than a light
bulb . It's a constant current LED. I have some from RS. I seem to remember
they pass about 12ma and will take a voltage of up to 30v. For more current
just wire them in parallel.
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