Finally Figured It Out

If the noise chapter is any indication this is going to be an epic and enduring tome! Hope to be able to contribute some nit-picks. I just bought an SR560 so it was nice to see the analysis of that.

Best regards, Spehro Pefhany

Elderly fat slob makes the kind of threat on his keyboard that might inconvenience him if he was silly enough to say anything similar in real life.

-- Bill Sloman, Nijmegen

Good news.

-- Bill Sloman, Nijmegen

He has, at times, challenged me to fist fights, road races, and some other nonsense that I can't recall.

I should have never sent him the beer. It didn't make him happy, and it's a sin to waste beer.

I requested a chapter on magnetics (after a magnificent Win Hill SED post on that subject), but I'm glad they didn't just update to new op-amps.

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That's a shame you'll miss some interesting posts. Mikek

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Probably not. He just pretends to killfile people. Weird old coot... as if being killfiled by him were some huge punishment or disgrace or something.

=A0 =A0 =A0 ...Jim Thompson

=A0 =A0 =A0...Jim Thompson

krw's posts are only "interesting" as horrible examples of ignorant prejudice. I suppose one needs to know that there are people around whose brains work that imperfectly, but a small dose goes a long way.

-- Bill Sloman, Nijmegen

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=A0 =A0 =A0 ...Jim Thompson

=A0 =A0 =A0 =A0...Jim Thompson

Anything but. His occasional responses to my posts aren't exactly constructive or informative, and they tend to be so out of touch with reality that it's hard to produce an amusingly disparaging response.

-- Bill Sloman, Nijmegen

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Oh, do try.

So, what cool circuits have you designed lately?

On Mar 19, 4:26=A0am, John Larkin wrote:

The low distortion variant of the Baxandall Class-D oscillator has mutated into an LC variant of the Wien bridge. The list of parts to buy from Farnell is now up to 26 items and about 500 euro, and it's only half done. Worse, it has been stuck at half done for a couple of days now, while I've re-explored a pulse-width modulated version of the Baxandall circuit - this time the voltage driven version of the class-D oscillator (fig. 8 from his paper).

LTSpice doesn't lend itself to modelling even the simplest versions of Don Lancaster's "magic sine waves" and they work even worse in this circuit than in the current-driven version of the Baxandall circuit, so it's been a total waste of time.

Version 4 SHEET 1 1992 1652 WIRE 192 -208 -1936 -208 WIRE 768 -48 736 -48 WIRE 960 -48 768 -48 WIRE 1184 -48 1040 -48 WIRE 1264 -48 1184 -48 WIRE -544 -32 -1584 -32 WIRE 192 -32 192 -208 WIRE -544 -16 -1424 -16 WIRE -320 -16 -480 -16 WIRE -192 -16 -320 -16 WIRE -16 -16 -112 -16 WIRE 144 -16 48 -16 WIRE -544 0 -1280 0 WIRE -544 16 -1136 16 WIRE -544 32 -560 32 WIRE -640 48 -992 48 WIRE 736 48 736 -48 WIRE 784 48 736 48 WIRE 1008 48 864 48 WIRE 1152 48 1008 48 WIRE 1264 48 1264 -48 WIRE 1264 48 1232 48 WIRE -640 64 -848 64 WIRE -560 64 -560 32 WIRE -560 64 -576 64 WIRE -640 80 -704 80 WIRE -704 96 -704 80 WIRE -640 96 -704 96 WIRE -704 112 -704 96 WIRE -640 112 -704 112 WIRE 192 208 192 64 WIRE 240 208 192 208 WIRE 320 208 240 208 WIRE 464 208 384 208 WIRE 608 208 544 208 WIRE 704 208 672 208 WIRE 736 208 704 208 WIRE 800 208 736 208 WIRE 1008 208 1008 48 WIRE 1008 208 880 208 WIRE -1584 224 -1584 -32 WIRE -1424 224 -1424 -16 WIRE -1280 224 -1280 0 WIRE -1136 224 -1136 16 WIRE -992 224 -992 48 WIRE -848 224 -848 64 WIRE -704 224 -704 112 WIRE 192 336 192 208 WIRE -1936 368 -1936 -208 WIRE -400 400 -1664 400 WIRE -400 416 -1504 416 WIRE -208 416 -336 416 WIRE -96 416 -208 416 WIRE 0 416 -16 416 WIRE 144 416 64 416 WIRE -400 432 -1360 432 WIRE 736 432 736 208 WIRE -400 448 -1216 448 WIRE -400 464 -416 464 WIRE -496 512 -1072 512 WIRE -496 528 -928 528 WIRE -416 528 -416 464 WIRE -416 528 -432 528 WIRE -496 544 -784 544 WIRE -784 560 -784 544 WIRE -496 560 -784 560 WIRE -784 576 -784 560 WIRE -496 576 -784 576 WIRE -1664 656 -1664 400 WIRE -1504 656 -1504 416 WIRE -1360 656 -1360 432 WIRE -1216 656 -1216 448 WIRE -1072 656 -1072 512 WIRE -928 656 -928 528 WIRE -784 656 -784 576 WIRE -1936 816 -1936 448 WIRE -1664 816 -1664 736 WIRE -1664 816 -1936 816 WIRE -1584 816 -1584 304 WIRE -1584 816 -1664 816 WIRE -1504 816 -1504 736 WIRE -1504 816 -1584 816 WIRE -1424 816 -1424 304 WIRE -1424 816 -1504 816 WIRE -1360 816 -1360 736 WIRE -1360 816 -1424 816 WIRE -1280 816 -1280 304 WIRE -1280 816 -1360 816 WIRE -1216 816 -1216 736 WIRE -1216 816 -1280 816 WIRE -1136 816 -1136 304 WIRE -1136 816 -1216 816 WIRE -1072 816 -1072 736 WIRE -1072 816 -1136 816 WIRE -992 816 -992 304 WIRE -992 816 -1072 816 WIRE -928 816 -928 736 WIRE -928 816 -992 816 WIRE -848 816 -848 304 WIRE -848 816 -928 816 WIRE -784 816 -784 736 WIRE -784 816 -848 816 WIRE -704 816 -704 304 WIRE -704 816 -784 816 WIRE 192 816 192 432 WIRE 192 816 -704 816 WIRE 736 816 736 496 WIRE 736 816 192 816 WIRE 1008 816 1008 208 WIRE 1008 816 736 816 WIRE -1936 864 -1936 816 FLAG -1936 864 0 FLAG 768 -48 out- FLAG 1184 -48 out+ FLAG 704 208 tank+ FLAG 240 208 Drive FLAG -208 416 N-FET_drive FLAG -320 -16 P-FET_drive SYMBOL ind2 784 224 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 454.93=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.022 SYMBOL cap 752 496 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C1 SYMATTR Value 220n SYMBOL voltage -1936 352 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 132 Left 2 SYMATTR SpiceLine Rser=3D0.001 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL ind2 768 64 R270 WINDOW 0 44 45 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L4 SYMATTR Value 15.75=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.004 Cpar=3D100pF SYMBOL ind2 1136 64 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L5 SYMATTR Value 15.75=B5 SYMATTR Type ind SYMATTR SpiceLine Rser=3D0.004 SYMBOL res 1056 -64 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 100R SYMBOL FerriteBead 352 208 R270 WINDOW 0 16 0 VTop 2 SYMATTR InstName L6 SYMATTR Value 1.545=B5 SYMATTR SpiceLine Ipk=3D0.2 Rser=3D1 Rpar=3D785 Cpar=3D535f mfg=3D"Wurth Elektronik eiSos" pn=3D"742 792 79" SYMBOL nmos 144 336 R0 SYMATTR InstName M3 SYMATTR Value FDS6680A SYMBOL pmos 144 64 M180 SYMATTR InstName M4 SYMATTR Value FDS4435A SYMBOL FerriteBead 32 416 R90 WINDOW 0 -16 0 VBottom 2 SYMATTR InstName L8 SYMATTR Value 1.542=B5 SYMATTR SpiceLine Ipk=3D1 Rser=3D0.3 Rpar=3D587 Cpar=3D1.216p mfg=3D"Wurth Elektronik eiSos" pn=3D"742 792 18" SYMBOL FerriteBead 16 -16 R270 WINDOW 0 16 0 VTop 2 SYMATTR InstName L10 SYMATTR Value 1.542=B5 SYMATTR SpiceLine Ipk=3D1 Rser=3D0.3 Rpar=3D587 Cpar=3D1.216p mfg=3D"Wurth Elektronik eiSos" pn=3D"742 792 18" SYMBOL voltage -1360 640 R0 WINDOW 3 42 490 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(5 0 2.0u 0.1u 0.1u 21.7u 31.8u 4000) SYMATTR InstName V4 SYMBOL voltage -1216 640 R0 WINDOW 3 -41 436 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(5 0 2.8u 0.1u 0.1u 20.6u 31.8u 4000) SYMATTR InstName V5 SYMBOL res -96 -32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 680 SYMBOL res 0 400 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 680 SYMBOL Digital\\or -368 368 R0 WINDOW 3 0 0 Invisible 2 SYMATTR Value Vhigh=3D5 Trise=3D10n SYMATTR InstName A1 SYMBOL Digital\\and -512 -64 R0 WINDOW 3 16 52 Invisible 2 SYMATTR Value Vhigh=3D5 Trise=3D10n Td=3D10n SYMATTR InstName A2 SYMBOL voltage -1664 640 R0 WINDOW 3 -185 218 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 5 0u 10n 10n 1.6081u 63,1575u 4000) SYMBOL voltage -1504 640 R0 SYMATTR InstName V3 SYMBOL voltage -1072 640 R0 SYMATTR InstName V6 SYMBOL voltage -928 640 R0 SYMATTR InstName V7 SYMBOL ind2 448 224 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 33mH SYMATTR Type ind SYMATTR SpiceLine Rser=3D1 Cpar=3D8.5p SYMBOL cap 608 224 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C2 SYMATTR Value 33n SYMBOL voltage -784 640 R0 SYMATTR InstName V8 SYMBOL voltage -1280 208 R0 WINDOW 3 81 767 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(5 0 2.0u 0.1u 0.1u 21.7u 31.8u 4000) SYMATTR InstName V9 SYMBOL voltage -1136 208 R0 WINDOW 3 -85 711 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(5 0 2.8u 0.1u 0.1u 20.6u 31.8u 4000) SYMATTR InstName V10 SYMBOL voltage -1584 208 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V11 SYMATTR Value PULSE(5 0 1.754275u 10n 10n 1.608178u 63.15750 4000) SYMBOL voltage -1424 208 R0 SYMATTR InstName V12 SYMATTR Value PULSE(5 0 5,263125u 10n 10n 1.608178u 63.15750 4000) SYMBOL voltage -992 208 R0 SYMATTR InstName V13 SYMATTR Value PULSE(5 0 8.771875u 10n 10n 1.608178u 63.15750 4000) SYMBOL voltage -848 208 R0 SYMATTR InstName V14 SYMATTR Value PULSE(5 0 31.57875u 10n 10n 1.608178u 63.15750 4000) SYMBOL voltage -704 208 R0 SYMATTR InstName V15 SYMATTR Value PULSE(5 0 35.0875u 10n 10n 1.608178u 63.15750 4000) SYMBOL Digital\\or -464 480 R0 WINDOW 3 0 0 Invisible 2 SYMATTR Value Vhigh=3D5 Trise=3D10n Td=3D10n SYMATTR InstName A3 SYMBOL Digital\\and -608 16 R0 WINDOW 3 16 52 Invisible 2 SYMATTR Value Vhigh=3D5 Trise=3D10n Td=3D10n SYMATTR InstName A4 TEXT -560 992 Left 2 !.tran 0 10m 0 10n TEXT 736 -248 Left 2 !K2 L1 L4 0.99 TEXT 736 -216 Left 2 !K3 L1 L5 0.99 TEXT -568 928 Left 2 !.ic I(L4)=3D-0.00 I(L5)=3D-0.000 I(L3)=3D-0.00003 I(L6)=3D0.00003 I(L1)=3D0 I(L2)=3D0\n.ic V(tank-)=3D0 TEXT 664 520 Left 2 ;+/-2% TEXT 816 272 Left 2 ;27T TEXT 816 104 Left 2 ;5T TEXT 1176 104 Left 2 ;5T

-- Bill Sloman, Nijmegen

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=A0 =A0 =A0 =A0 ...Jim Thompson

=A0 =A0 =A0 =A0...Jim Thompson

I do what I can ...

-- Bill Sloman, Nijmegen

Right.

Slowman, Please post your street address.

Ooh, he's gonna come and get you.

He knows my street address, and I expect him to attack me with his cane, maybe try to hit me with his walker, any day now.

Are you going to back him up? Push his wheelchair while he shakes his cane at me? Make sure you guys remember your shawls and hot-water bottles... it's cold in San Francisco. After you beat me up, you can hold hands and tour the Castro.