9v to 4.5v adapters

Just wondering if anyone has developed something like this, to run
4.5v motors (or other parts) on 9v systems.
I think I've come up with a simple answer, but I'd rather see what
others have done first :)
Any clues/pointers appreciated.
Errol Smith
errol ros (dot) com [period] au
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Errol Smith
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