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Present for Larkin

Hey, John, what do you think about this?:

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-3 FLAG -480 192 0 FLAG -432 48 +3 FLAG -432 112 -3 FLAG -480 832 0 FLAG -432 688 +3 FLAG -432 752 -3 FLAG -288 224 0 FLAG -288 544 0 FLAG -288 864 0 FLAG -224 80 PHASE3 FLAG -224 400 PHASE2 FLAG -224 720 PHASE1 SYMBOL Digital\\dflop -1856 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U1 SYMBOL voltage -2400 384 R0 WINDOW 3 24 104 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 12 104 Left 2 SYMATTR Value PULSE(-3 3 0 1E-6 1E-6 .008333 .016666) SYMATTR InstName V1 SYMBOL cap -2096 240 R90 WINDOW 0 -33 25 VBottom 2 WINDOW 3 -33 27 VTop 2 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL res -2064 304 R90 WINDOW 0 68 58 VBottom 2 WINDOW 3 71 58 VTop 2 SYMATTR InstName R1 SYMATTR Value 1e5 SYMBOL Digital\\dflop -1600 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U2 SYMBOL Digital\\dflop -1376 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U3 SYMBOL Digital\\dflop -1088 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U4 SYMBOL Digital\\dflop -864 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U5 SYMBOL cap -496 432 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -26 57 Left 2 SYMATTR InstName C5 SYMATTR Value 11n SYMBOL cap -624 320 R0 WINDOW 0 -19 5 Left 2 WINDOW 3 -27 56 Left 2 SYMATTR InstName C4 SYMATTR Value 22n SYMBOL res -624 400 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R5 SYMATTR Value 1meg SYMBOL res -480 400 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 1meg SYMBOL voltage -2208 496 R180 WINDOW 3 37 109 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 -41 6 Left 2 SYMATTR Value 3 SYMATTR InstName V4 SYMBOL voltage -2304 384 R0 WINDOW 3 37 109 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 14 107 Left 2 SYMATTR Value 3 SYMATTR InstName V5 SYMBOL cap -496 112 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -26 59 Left 2 SYMATTR InstName C3 SYMATTR Value 11n SYMBOL cap -624 0 R0 WINDOW 0 -22 11 Left 2 WINDOW 3 -27 52 Left 2 SYMATTR InstName C2 SYMATTR Value 22n SYMBOL res -624 80 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R2 SYMATTR Value 1meg SYMBOL res -480 80 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 1meg SYMBOL cap -496 752 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -23 58 Left 2 SYMATTR InstName C7 SYMATTR Value 11n SYMBOL cap -624 640 R0 WINDOW 0 -18 6 Left 2 WINDOW 3 -25 58 Left 2 SYMATTR InstName C6 SYMATTR Value 22n SYMBOL res -624 720 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R8 SYMATTR Value 1meg SYMBOL res -480 720 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 1meg SYMBOL Opamps\\LT1677 -432 16 R0 SYMATTR InstName U6 SYMBOL res -304 96 R0 SYMATTR InstName R4 SYMATTR Value 1000 SYMBOL res -304 416 R0 SYMATTR InstName R7 SYMATTR Value 1000 SYMBOL res -304 736 R0 SYMATTR InstName R10 SYMATTR Value 1000 SYMBOL Opamps\\LT1677 -432 336 R0 SYMATTR InstName U7 SYMBOL Opamps\\LT1677 -432 656 R0 SYMATTR InstName U8 TEXT -2432 560 Left 2 !.tran 1 startup uic TEXT -2432 592 Left 2 !;ac oct 128 1 100

The Sallen-Keys on the outputs aren't great, but they're not too shabby, either, and can be easily replaced with better, if required.

The important part is that their inputs are all square waves _exactly_

120 degrees apart, et voila! digital 3 phase generator on the cheap.

Comments?

JF

Reply to
John Fields
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On Thu, 26 Nov 2015 16:12:40 -0600, John Fields wrote:

Yeah, the filters are the big problem. If their Q is low, the sine waves are ugly. If they are high, component tolerances make the amplitudes and phase shifts erratic. The filter problem can be fixed by starting with something better than a square wave. DACS are good, but then it's not so on-the-cheap.

There are tricks with resistors that help some, sort of like this...

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736 -608 736 WIRE -480 736 -496 736 WIRE -464 736 -480 736 WIRE -480 752 -480 736 WIRE -288 752 -288 720 WIRE -480 832 -480 816 WIRE -288 864 -288 832 FLAG -2448 624 0 FLAG -480 512 0 FLAG -2304 224 +3 FLAG -2208 224 -3 FLAG -432 368 +3 FLAG -432 432 -3 FLAG -480 192 0 FLAG -432 48 +3 FLAG -432 112 -3 FLAG -480 832 0 FLAG -432 688 +3 FLAG -432 752 -3 FLAG -288 224 0 FLAG -288 544 0 FLAG -288 864 0 FLAG -224 80 PHASE3 FLAG -224 400 PHASE2 FLAG -224 720 PHASE1 SYMBOL Digital\\dflop -1856 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U1 SYMBOL voltage -2400 384 R0 WINDOW 3 24 104 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 12 104 Left 2 SYMATTR Value PULSE(-3 3 0 1E-6 1E-6 .008333 .016666) SYMATTR InstName V1 SYMBOL cap -2096 240 R90 WINDOW 0 -33 25 VBottom 2 WINDOW 3 -33 27 VTop 2 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL res -2064 304 R90 WINDOW 0 68 58 VBottom 2 WINDOW 3 71 58 VTop 2 SYMATTR InstName R1 SYMATTR Value 1e5 SYMBOL Digital\\dflop -1600 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U2 SYMBOL Digital\\dflop -1376 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U3 SYMBOL Digital\\dflop -1088 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U4 SYMBOL Digital\\dflop -864 48 R0 WINDOW 3 8 168 Invisible 2 SYMATTR Value trise 1e-7 tfall 1e-7 vhigh 3 vlow -3 SYMATTR InstName U5 SYMBOL cap -496 432 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -26 57 Left 2 SYMATTR InstName C5 SYMATTR Value 11n SYMBOL cap -624 320 R0 WINDOW 0 -19 5 Left 2 WINDOW 3 -27 56 Left 2 SYMATTR InstName C4 SYMATTR Value 22n SYMBOL res -832 400 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R5 SYMATTR Value 2Meg SYMBOL res -480 400 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 1meg SYMBOL voltage -2208 496 R180 WINDOW 3 37 109 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 -41 6 Left 2 SYMATTR Value 3 SYMATTR InstName V4 SYMBOL voltage -2304 384 R0 WINDOW 3 37 109 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 0 14 107 Left 2 SYMATTR Value 3 SYMATTR InstName V5 SYMBOL cap -496 112 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -26 59 Left 2 SYMATTR InstName C3 SYMATTR Value 11n SYMBOL cap -624 0 R0 WINDOW 0 -22 11 Left 2 WINDOW 3 -27 52 Left 2 SYMATTR InstName C2 SYMATTR Value 22n SYMBOL res -624 80 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R2 SYMATTR Value 1meg SYMBOL res -480 80 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 1meg SYMBOL cap -496 752 R0 WINDOW 0 -41 34 Left 2 WINDOW 3 -23 58 Left 2 SYMATTR InstName C7 SYMATTR Value 11n SYMBOL cap -624 640 R0 WINDOW 0 -18 6 Left 2 WINDOW 3 -25 58 Left 2 SYMATTR InstName C6 SYMATTR Value 22n SYMBOL res -624 720 R90 WINDOW 0 65 62 VBottom 2 WINDOW 3 70 60 VTop 2 SYMATTR InstName R8 SYMATTR Value 1meg SYMBOL res -480 720 R90 WINDOW 0 -30 53 VBottom 2 WINDOW 3 -28 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 1meg SYMBOL Opamps\\LT1677 -432 16 R0 SYMATTR InstName U6 SYMBOL res -304 96 R0 SYMATTR InstName R4 SYMATTR Value 1000 SYMBOL res -304 416 R0 SYMATTR InstName R7 SYMATTR Value 1000 SYMBOL res -304 736 R0 SYMATTR InstName R10 SYMATTR Value 1000 SYMBOL Opamps\\LT1677 -432 336 R0 SYMATTR InstName U7 SYMBOL Opamps\\LT1677 -432 656 R0 SYMATTR InstName U8 SYMBOL res -832 512 R90 WINDOW 0 68 55 VBottom 2 WINDOW 3 72 55 VTop 2 SYMATTR InstName R11 SYMATTR Value 6Meg SYMBOL res -832 288 R90 WINDOW 0 68 55 VBottom 2 WINDOW 3 72 55 VTop 2 SYMATTR InstName R12 SYMATTR Value 6Meg TEXT -2432 560 Left 2 !.tran 5 startup uic TEXT -2432 592 Left 2 !;ac oct 128 1 100

Reply to
John Larkin

I like this comment "et voila!" especially when English is spoken. I can ha rdly smile to myself "in petto".

Habib.

Reply to
habib.bouaziz

French is considered elegant here. We buy food that is labeled in English and in French, when about half the population here speaks Spanish or Cantonese.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

oh yes ! Better to know what you eat than purchase any sort of "Frankenstein food". Here in France there is guidance for ; "label Rouge", AOC, AOP...etc. A little bit more expensive but not so much as a healthy point of view.

Reply to
Habib Bouaziz-Viallet

. . .

--
Actually, I was asking for comments on the generator, but since you 
chose to sidestep that and address the filter issue instead, how does 
your "help" not exacerbate the phase shift and amplitude problems? 

JF
Reply to
John Fields

Generating 3-phase square waves is not very challenging. As I said, the interesting part of the problem is the filters.

My sine waves look a lot better than your sine waves, with no higher filter Q.

You could do even better by using a higher frequency clock and a longer shift register. That would provide more taps, and allow more resistive mixing to feed the filters a better approximation of a sine wave. Use some q-bars, too.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin 

--
Y'know, John, I guess I should be used to it by now, but it never 
ceases to amaze me just how desperate you are for perpetual 
validation.  Sad, really...
Reply to
John Fields

And I'm always impressed by how many cool things that you show no interest in.

I don't need perpetual validation, but I do need perpetual amusement. The only thing I have ever been afraid of is boredom.

Reply to
John Larkin 

--
"Cool" according to you isn't, really, it's just more of your "Hitch 
your wagon to my star" bullshit.
Reply to
John Fields

It's a discussion group. It would be dead if nobody discussed electronics.

Why did you post this circuit? Looking for attention? Validation? Praise? But you didn't want it discussed!!

Most of usenet is dead. SED is popular enough that it gets replicated in many places on the web.

Neon walrus relay logic

Wait a couple days and google that.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

On Tue, 01 Dec 2015 13:21:36 -0800, John Larkin Gave us:

*I* am the walrus!
Reply to
DecadentLinuxUserNumeroUno

You must be very popular with the lady walruses.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin 

--
It's already moribund thanks to narcissists like you, who instead of 
using it as channel for communication use it advance their own aims.
Reply to
John Fields

My evil aim is to discuss circuit design.

I did not.

Reply to
John Larkin 

--
Not at all true.  

Just take a look at all of the off-topic nonsense that all of you 
posers upload here, and it becomes apparent that those of us who're 
really interested in discussing electronic design have a barrier to 
overcome which shouldn't be there.  

>Why did you post this circuit?  

Because you asked me to. 

>Looking for attention? Validation? 
>Praise? But you didn't want it discussed!! 

Some of the above,since it's a nice circuit, but derision seems to be 
your aim and derision seems to be your ken. 

>Most of usenet is dead. SED is popular enough that it gets replicated 
>in many places on the web.
Reply to
John Fields

I didn't initially deride your circuit, I improved it.

Reply to
John Larkin

On Wed, 02 Dec 2015 20:36:46 -0800, John Larkin Gave us:

Then, you went completely brain dead (not a big leap) and forgot why he posted it and even spouted demeaning horseshit in that vein.

You are truly pathetic. I would say selectively so, but you are whether you select to be so publicly or not.

Reply to
DecadentLinuxUserNumeroUno

It made an ugly sine wave. I made it better. He didn't appreciate that.

I wonder why.

Reply to
John Larkin

...interesting...Both the Baby Bird (GooGull) and the Quacker (DuckDuckGo) give as top "hits" ladder logic and neon lamp logic.

Maybe climbing up the ladder is a gas?

Reply to
Robert Baer

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