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From: "Phil Allison"
References: <email@example.com> <firstname.lastname@example.org> <3debaeec.2879341@News.xtra.co.nz>
Subject: Re: 'Current Dumping' Amplifier Circuits ?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Tue, 3 Dec 2002 09:20:29 +1100
NNTP-Posting-Date: Tue, 03 Dec 2002 09:09:45 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Mike Diack" wrote in message
> Indeed, but that didn't stop a generation of enthusiastic amateurs
> cloning it. At one point I reckon there were enough "Quasi Quads"
> appearing out of the Antipodes to give Huntingdon a run for their
> money. One of the local transformer manufacturers even had a "Current
> Dumper" power transformer on their stock line printed price list !.
> As Phil pointed out, the freedom from bias adjustment made it an
> attractive topology.
** Not to mention " something wonderful happens when Z1.Z2 = Z3.Z4 " !!
> A detailed design analysis in "Wireless World" rather helped the war
> effort as well.
** Mr Walker et alia are too honest for their own good sometimes.
> The circuit also lent itself well to upscaling (ie add more output
> devices, uprate all device voltages and rail voltage & hey presto -
> Jumbo Dumper).
** Hmmmm, like to see that. I always wondered why the PA amp makers
never latched on to the scheme.
BTW Although the original patent may have just expired Quad own the
name "Current Dumping" so others will have to pay a licence fee or go dream
up another name.
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