John Lussmyer wrote:

> Is there any kind of simple circuit I could add to the ammeter to
> make it useful?

They probably just used a cheap meter. Any quality D'Arsenval movement
meter will correctly read average voltage. Likewise, even most
inexpensive digital meters have decent enough input filters to
accurately read average voltage.
-- 
Lee A. Hart                Ring the bells that still can ring
814 8th Ave. N.            Forget your perfect offering
Sartell, MN 56377 USA      There is a crack in everything
leeahart_at_earthlink.net  That's how the light gets in - Leonard Cohen

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