From: invalid@invalid.invalid
"Cursitor Doom" wrote in message news:ga85mk
2chdagqnra78klbtd9fkr3t5bcm@4ax.com...
> 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?
You can have fun with them in audio amplifiers if you want.
But there are many reasons why I won't be putting this into production
any time soon. It takes very little adjustment of R16 to blow up the FETs.
Version 4.1
SHEET 1 1636 1096
WIRE -1472 -64 -1568 -64
WIRE -752 -64 -1472 -64
WIRE 160 -64 -752 -64
WIRE 336 -64 160 -64
WIRE 480 -64 336 -64
WIRE 640 -64 480 -64
WIRE 768 -64 640 -64
WIRE 816 -64 768 -64
WIRE 832 -64 816 -64
WIRE 160 -32 160 -64
WIRE 336 -16 336 -64
WIRE -752 0 -752 -64
WIRE 480 0 480 -64
WIRE -1472 16 -1472 -64
WIRE 640 80 640 -64
WIRE 336 96 336 64
WIRE -800 128 -928 128
WIRE -752 128 -752 80
WIRE -752 128 -800 128
WIRE 480 128 480 80
WIRE 576 128 480 128
WIRE -1472 144 -1472 80
WIRE -928 144 -928 128
WIRE 160 144 160 96
WIRE 272 144 160 144
WIRE -752 176 -752 128
WIRE 480 176 480 128
WIRE 336 224 336 192
WIRE 416 224 336 224
WIRE 768 224 768 -64
WIRE -928 272 -928 208
WIRE 336 272 336 224
WIRE 640 304 640 176
WIRE 672 304 640 304
WIRE 480 320 480 272
WIRE 640 336 640 304
WIRE -496 368 -560 368
WIRE -448 368 -496 368
WIRE -256 368 -320 368
WIRE -224 368 -256 368
WIRE 336 368 336 336
WIRE -752 464 -752 256
WIRE -672 464 -752 464
WIRE -560 464 -560 368
WIRE -560 464 -592 464
WIRE -528 464 -560 464
WIRE -368 464 -448 464
WIRE -320 464 -320 368
WIRE -320 464 -368 464
WIRE -144 464 -320 464
WIRE 480 464 480 400
WIRE 480 464 -64 464
WIRE 480 480 480 464
WIRE 624 480 480 480
WIRE 640 480 640 416
WIRE 640 480 624 480
WIRE 768 480 768 384
WIRE 768 480 640 480
WIRE -1568 496 -1568 -64
WIRE 336 496 336 432
WIRE 768 496 768 480
WIRE 864 496 768 496
WIRE 1024 496 864 496
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WIRE -368 512 -368 464
WIRE 480 512 480 480
WIRE -816 560 -896 560
WIRE -224 560 -304 560
WIRE 624 576 624 480
WIRE 1024 576 1024 496
WIRE -896 592 -896 560
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WIRE 560 624 480 624
WIRE -1328 640 -1408 640
WIRE -1072 640 -1264 640
WIRE -1024 640 -1072 640
WIRE -960 640 -1024 640
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WIRE -64 640 -112 640
WIRE -32 640 -64 640
WIRE 480 656 480 624
WIRE 160 672 160 144
WIRE 336 704 336 672
WIRE 416 704 336 704
WIRE 768 704 768 496
WIRE -1024 720 -1024 640
WIRE -112 720 -112 640
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WIRE 624 752 624 672
WIRE 624 752 480 752
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WIRE -640 768 -752 768
WIRE -368 768 -368 608
WIRE -272 768 -368 768
WIRE 1024 768 1024 640
WIRE 624 784 624 752
WIRE 672 784 624 784
WIRE -752 832 -752 768
WIRE -368 832 -368 768
WIRE 336 832 336 704
WIRE 624 848 624 784
WIRE -640 880 -640 768
WIRE -640 880 -688 880
WIRE -432 880 -640 880
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WIRE 272 880 -272 880
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WIRE -896 976 -1024 976
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WIRE -752 976 -896 976
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WIRE 160 976 -112 976
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WIRE 336 976 160 976
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WIRE 1024 976 1024 848
WIRE 1024 976 768 976
WIRE 1120 976 1024 976
WIRE -1568 1024 -1568 976
FLAG 816 -64 Vs6
FLAG 864 496 Vout5
FLAG -1568 1024 0
FLAG -64 640 In+3
FLAG -800 128 Byp7
FLAG -496 368 Gain8
FLAG -256 368 Gain1
FLAG -1072 640 In-2
FLAG -1472 144 0
FLAG -928 272 0
SYMBOL npn 416 176 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp 272 192 M180
WINDOW 0 -51 25 Left 2
WINDOW 3 -54 -5 Left 2
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL diode 176 -32 M0
WINDOW 0 47 32 Left 2
WINDOW 3 -78 31 Left 2
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 176 32 M0
WINDOW 0 49 30 Left 2
WINDOW 3 -83 30 Left 2
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL res 352 -32 M0
SYMATTR InstName R1
SYMATTR Value 330
SYMBOL res 144 656 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL pnp 416 752 M180
WINDOW 0 -31 88 Left 2
WINDOW 3 40 52 Left 2
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL npn 272 832 R0
WINDOW 0 -22 -1 Left 2
WINDOW 3 -60 106 Left 2
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL res -48 448 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 15k
SYMBOL voltage -1568 480 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL pnp -304 608 R180
WINDOW 0 72 31 Left 2
WINDOW 3 45 61 Left 2
SYMATTR InstName Q6
SYMATTR Value 2N3906
SYMBOL pnp -160 688 R180
WINDOW 0 72 31 Left 2
WINDOW 3 45 61 Left 2
SYMATTR InstName Q7
SYMATTR Value 2N3906
SYMBOL res -128 704 R0
SYMATTR InstName R4
SYMATTR Value 50k
SYMBOL pnp -816 608 M180
WINDOW 0 72 31 Left 2
WINDOW 3 45 61 Left 2
SYMATTR InstName Q8
SYMATTR Value 2N3906
SYMBOL pnp -960 688 M180
WINDOW 0 72 31 Left 2
WINDOW 3 45 61 Left 2
SYMATTR InstName Q9
SYMATTR Value 2N3906
SYMBOL res -576 448 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 150
SYMBOL res -432 448 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1.35k
SYMBOL res -768 -16 R0
SYMATTR InstName R7
SYMATTR Value 15k
SYMBOL res -768 160 R0
SYMATTR InstName R8
SYMATTR Value 15k
SYMBOL res -1040 704 R0
SYMATTR InstName R9
SYMATTR Value 50k
SYMBOL npn -432 832 R0
SYMATTR InstName Q10
SYMATTR Value 2N3904
SYMBOL npn -688 832 M0
SYMATTR InstName Q11
SYMATTR Value 2N3904
SYMBOL voltage -1408 736 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 100m 1000)
SYMBOL cap -1264 624 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1000n
SYMBOL polcap -1488 16 R0
SYMATTR InstName C2
SYMATTR Value 47000n
SYMBOL polcap -944 144 R0
SYMATTR InstName C3
[continued in next message]
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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