Re: 60 Hz hum filter

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Article #20818

#20818

From: Ron Natalie
Date: Mon, 20 Feb 1989 18:59

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Well your average AC adapter/Ni-Cad charger is a pretty cheap thing.  What it
is is a step down transformer (with enough resistance in the windings to be a
current limitter as well) and a diode.  When charging NiCad's you don't
need filtering and you don't need voltage regulation.  When running the
calculator/radio/whatever off the charger the battery pack provides
the voltage regulation, hence the warning not to operate without the
batteries in place.  You probably need to add a some nice capacitance
accross the rectified AC to smooth it out enough not to be obnoxious.

-Ron

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References: <2313@rayssdb.ray.com> <4004@midas.STS.TEK.COM>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!elbereth.rutgers.edu!ron.rutgers.edu!ron
From: ron@ron.rutgers.edu (Ron Natalie)
Newsgroups: sci.electronics
Subject: Re: 60 Hz hum filter
Keywords: any ideas
Message-ID: <Feb.20.13.59.40.1989.220@ron.rutgers.edu>
Date: 20 Feb 89 18:59:51 GMT
References: <2313@rayssdb.ray.com> <4004@midas.STS.TEK.COM>
Organization: Rutgers Univ., New Brunswick, N.J.
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