Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: multi-supply audio amp
Date: Wed, 8 Jan 2025 00:09:51 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 31
Message-ID: <vlkfof$2epso$1@dont-email.me>
References: <e7uqnjlhaesulfrqc7n6q961degb556kga@4ax.com>
 <vlk689$2cr1c$2@dont-email.me>
 <aq8rnjtgefh85dbo7v3eumra02mt55rtsk@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 08 Jan 2025 01:09:51 +0100 (CET)
Injection-Info: dont-email.me; posting-host="d1fc824f82190a0373e79f24f0b481be";
	logging-data="2582424"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+aUWBEqHI+i3dOE1QrGkOH"
User-Agent: NewsTap/5.5 (iPhone/iPod Touch)
Cancel-Lock: sha1:xzZXvt8fqZJ1WRukKqahOT7rgEs=
	sha1:CHzVW/edKK0EeMoXmRzFS9bFxAM=
Bytes: 2187

john larkin <jl@glen--canyon.com> wrote:
> On Tue, 7 Jan 2025 22:27:37 +0100, Lasse Langwadt <llc@fonz.dk> wrote:
> 
>> On 1/7/25 20:19, john larkin wrote:
>>> I recall that there was an audio power amp topology that used two
>>> transistors and two power supplies for each polarity output. Low
>>> voltage swings used a low voltage supply but it cut over to a HV
>>> supply for big swings, with diodes or something.
>>> 
>>> What was that called?
>>> 
>> 
>> class-G (or H) depending on who you ask
>> 
>> https://sound-au.com/articles/class-g.htm
> 
> Cool. Thanks.
> 
> I need a power amp that runs near ground most of the time but spikes
> to higher output voltage occasionally. And runs 4 quadrant.
> 
> I have a switcher design that looks good, but it's slow.  

Our TEC controller is like that, 4-quadrant asymmetric bridge, but current
mode. Too slow for audio, but that’s mostly parts values. 
Cheers 

Phil Hobbs 
-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics