From: cd@notformail.com   
      
   On Sat, 10 Jan 2026 11:39:24 -0800, john larkin    
   wrote:   
      
   >On Sat, 10 Jan 2026 18:58:44 +0000, Cursitor Doom    
   >wrote:   
   >   
   >>On Sat, 10 Jan 2026 05:56:18 -0800, john larkin    
   >>wrote:   
   >>   
   >>>On Sat, 10 Jan 2026 11:19:56 +0000, Cursitor Doom    
   >>>wrote:   
   >>>   
   >>>>Are they typically, or invariably even, set up to run in class D?   
   >>>>   
   >>>>CD   
   >>>   
   >>>Certainly switchmode, not linear.   
   >>>   
   >>>There are a bunch of named classes, but all are basically class D.   
   >>>   
   >>>GaNs can switch really fast, which for a given power makes things   
   >>>small.  Aside from that, they have no real advantages over mosfets.   
   >>>   
   >>>A delta-sigma GaN amp might be fun.   
   >>>   
   >>>But audio makes no sense, which is why people still spend big on   
   >>>turntables and tubes.   
   >>   
   >>So what else are they suited to?   
   >   
   >GaN? Lots of things.   
   >   
   >We're using them in fast switches, the output stages of this:   
   >   
   >https://highlandtechnology.com/Product/P500   
   >   
   >which makes beautiful clean pulses. We're doing a high voltage pulse   
   >generator too.   
   >   
   >GaN is used in tiny wall warts. And for RF stuff. I think some   
   >microwave ovens use them instead of magnetrons.   
   >   
   >Their figures of merit, amps/pF and such, are astounding. And they   
   >turn on hard with 5-volt gate drive.   
      
   Got a ballpark Rdson?   
      
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   >John Larkin   
   >Highland Tech Glen Canyon Design Center   
   >Lunatic Fringe Electronics   
      
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