Re: multi-supply audio amp

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