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CML-CML level shifter

I have a differential output from a fast CML flipflop, powered by +3 and ground, and want to drive another CML-input part. If the load gadget was also powered from +3, I'd just connect them with a couple of 50 ohm traces. But the Vcc of the destination part could be anything from +3 to -2.

I want full speed and DC coupling, so the ideal part to put in series with both runs is a battery of the appropriate voltage, namely the difference in supply voltages. Couldn't find anything that would work like that.

This thing below sorta fakes the batteries. It seems to work. The constraints on the CML transmitter (how far can the pins actually swing?) and on the receiver device (how far can the pins actually swing?) are far from clear, so we'll have to test this some.

This looks pretty simple, but took a lot of thinking and many stupid simulations to get it to be simple. It bothered me enough to keep at it. Can't ski... too much snow.

Version 4 SHEET 1 2664 1128 WIRE 48 32 -144 32 WIRE 128 32 48 32 WIRE 320 32 288 32 WIRE 352 32 320 32 WIRE 544 32 496 32 WIRE 576 32 544 32 WIRE 848 32 736 32 WIRE 944 32 848 32 WIRE 1328 32 1296 32 WIRE 1360 32 1328 32 WIRE 1664 32 1632 32 WIRE 1696 32 1664 32 WIRE -144 80 -144 32 WIRE 944 80 944 32 WIRE 1296 80 1296 32 WIRE 1632 80 1632 32 WIRE 128 144 128 32 WIRE 288 144 288 32 WIRE 496 144 496 32 WIRE 736 144 736 32 WIRE 1296 192 1296 160 WIRE 1632 192 1632 160 WIRE -144 224 -144 160 WIRE 944 224 944 160 WIRE -32 368 -144 368 WIRE 128 368 128 224 WIRE 128 368 48 368 WIRE 224 368 128 368 WIRE 288 368 288 224 WIRE 288 368 224 368 WIRE 352 368 288 368 WIRE 496 368 496 224 WIRE 496 368 416 368 WIRE 608 368 496 368 WIRE 736 368 736 224 WIRE 736 368 608 368 WIRE 1328 416 1296 416 WIRE 1360 416 1328 416 WIRE 1664 416 1632 416 WIRE 1696 416 1664 416 WIRE -144 448 -144 368 WIRE 1296 464 1296 416 WIRE 1632 464 1632 416 WIRE 1216 480 1200 480 WIRE 1264 480 1216 480 WIRE 1600 480 1488 480 WIRE 1376 496 1328 496 WIRE 1392 496 1376 496 WIRE 1712 496 1664 496 WIRE 1728 496 1712 496 WIRE 1264 512 1152 512 WIRE 1488 512 1488 480 WIRE 1552 512 1536 512 WIRE 1600 512 1552 512 WIRE 1152 544 1152 512 WIRE 1296 576 1296 528 WIRE 1328 576 1296 576 WIRE 1360 576 1328 576 WIRE 1632 576 1632 528 WIRE 1664 576 1632 576 WIRE 1696 576 1664 576 WIRE -32 768 -144 768 WIRE 128 768 48 768 WIRE 224 768 128 768 WIRE 304 768 224 768 WIRE 352 768 304 768 WIRE 496 768 416 768 WIRE 608 768 496 768 WIRE 736 768 608 768 WIRE 1344 816 1296 816 WIRE 1376 816 1344 816 WIRE 1712 816 1632 816 WIRE 1744 816 1712 816 WIRE -144 864 -144 768 WIRE 1296 864 1296 816 WIRE 1632 864 1632 816 WIRE 128 880 128 768 WIRE 304 880 304 768 WIRE 496 880 496 768 WIRE 736 880 736 768 WIRE 1216 880 1184 880 WIRE 1248 880 1216 880 WIRE 1552 880 1536 880 WIRE 1584 880 1552 880 WIRE 1216 928 1184 928 WIRE 1248 928 1216 928 WIRE 1552 928 1536 928 WIRE 1584 928 1552 928 WIRE 1296 976 1296 944 WIRE 1632 976 1632 944 WIRE 64 1056 16 1056 WIRE 128 1056 128 960 WIRE 128 1056 64 1056 WIRE 304 1056 304 960 WIRE 352 1056 304 1056 WIRE 384 1056 352 1056 WIRE 496 1056 496 960 WIRE 528 1056 496 1056 WIRE 560 1056 528 1056 WIRE 736 1056 736 960 WIRE 816 1056 736 1056 WIRE 880 1056 816 1056 FLAG -144 224 0 FLAG 944 224 0 FLAG 224 768 FF- FLAG 848 32 VH FLAG 48 32 Vcc FLAG 64 1056 Vcc FLAG -144 448 0 FLAG -144 864 0 FLAG 816 1056 VH FLAG 224 368 FF+ FLAG 608 768 SY- FLAG 608 368 SY+ FLAG 320 32 A FLAG 544 32 B FLAG 528 1056 A FLAG 352 1056 B FLAG 1632 976 0 FLAG 1712 816 DIFF FLAG 1552 880 SY+ FLAG 1552 928 SY- FLAG 1296 192 0 FLAG 1632 192 0 FLAG 1328 32 AH FLAG 1664 32 AL FLAG 1296 976 0 FLAG 1344 816 GO FLAG 1216 880 FF+ FLAG 1216 928 FF- FLAG 1328 416 AH FLAG 1328 576 AL FLAG 1664 416 AH FLAG 1664 576 AL FLAG 1376 496 A FLAG 1712 496 B FLAG 1152 544 0 FLAG 1216 480 GO FLAG 1488 512 0 FLAG 1552 512 GO SYMBOL res 112 128 R0 WINDOW 0 -64 41 Left 2 WINDOW 3 -63 73 Left 2 SYMATTR InstName R1 SYMATTR Value 50 SYMBOL current 48 368 R90 WINDOW 0 -97 29 VRight 2 WINDOW 3 -57 -54 VRight 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Icml SYMATTR Value PULSE(16m 0 1u 5n 1n 100u) SYMBOL voltage -144 64 R0 WINDOW 0 65 38 Left 2 WINDOW 3 72 68 Left 2 SYMATTR InstName V1 SYMATTR Value 3 SYMBOL res 720 128 R0 WINDOW 0 62 38 Left 2 WINDOW 3 63 74 Left 2 SYMATTR InstName R2 SYMATTR Value 50 SYMBOL voltage 944 64 R0 WINDOW 0 -86 34 Left 2 WINDOW 3 -77 61 Left 2 SYMATTR InstName VH SYMATTR Value 2 SYMBOL res 112 864 R0 WINDOW 0 -62 35 Left 2 WINDOW 3 -62 69 Left 2 SYMATTR InstName R3 SYMATTR Value 50 SYMBOL bi 48 768 R90 WINDOW 0 -91 40 VBottom 2 WINDOW 3 -77 44 VTop 2 SYMATTR InstName B1 SYMATTR Value I=16m-I(Icml) SYMBOL cap 416 352 R90 WINDOW 0 -43 31 VBottom 2 WINDOW 3 -35 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL cap 416 752 R90 WINDOW 0 70 29 VBottom 2 WINDOW 3 77 27 VTop 2 SYMATTR InstName C3 SYMATTR Value 1µ SYMBOL res 720 864 R0 WINDOW 0 62 42 Left 2 WINDOW 3 62 71 Left 2 SYMATTR InstName R9 SYMATTR Value 50 SYMBOL res 304 240 R180 WINDOW 0 -51 69 Left 2 WINDOW 3 -62 38 Left 2 SYMATTR InstName R4 SYMATTR Value 1.5K SYMBOL res 480 128 R0 WINDOW 0 56 40 Left 2 WINDOW 3 48 73 Left 2 SYMATTR InstName R5 SYMATTR Value 1.5K SYMBOL res 320 976 R180 WINDOW 0 -51 69 Left 2 WINDOW 3 -60 37 Left 2 SYMATTR InstName R7 SYMATTR Value 1.5K SYMBOL res 480 864 R0 WINDOW 0 58 35 Left 2 WINDOW 3 48 70 Left 2 SYMATTR InstName R8 SYMATTR Value 1.5K SYMBOL e 1632 848 R0 WINDOW 0 53 41 Left 2 WINDOW 3 60 67 Left 2 SYMATTR InstName E2 SYMATTR Value 1 SYMBOL Opamps\\UniversalOpamp2 1296 496 R0 SYMATTR InstName U2 SYMATTR Value2 Avol=1Meg GBW=10Meg Slew=20Meg SYMBOL voltage 1296 64 R0 WINDOW 0 52 41 Left 2 WINDOW 3 60 70 Left 2 SYMATTR InstName V2 SYMATTR Value 6 SYMBOL voltage 1632 64 R0 WINDOW 0 55 36 Left 2 WINDOW 3 53 67 Left 2 SYMATTR InstName V3 SYMATTR Value -6 SYMBOL e 1296 848 R0 WINDOW 0 51 33 Left 2 WINDOW 3 55 63 Left 2 SYMATTR InstName E1 SYMATTR Value 1 SYMBOL Opamps\\UniversalOpamp2 1632 496 R0 SYMATTR InstName U1 SYMATTR Value2 Avol=1Meg GBW=10Meg Slew=20Meg TEXT -64 560 Left 2 ;CML Flop TEXT 800 560 Left 2 ;CML Load TEXT 264 504 Left 3 ;CML-CML Level Shifter TEXT 328 616 Left 2 !.tran 0 200u 0 TEXT 320 560 Left 2 ;JL Dec 24 2021 TEXT 896 272 Left 2 ;+3 to -2 RECTANGLE Normal 176 1120 -224 -32 2 RECTANGLE Normal 1040 1120 640 -32 2

Reply to
John Larkin
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So, do that. Just a capacitor, obviously, won't have the constant DC step if there's any low frequencies present, but you can put a three-transistor current mirror dual-source on the most positive rail, and another three-transistor current mirror dual-sink on the most negative rail, and connect the input transistors' bases of those mirrors with the appropriate resistor to make a constant-current bias. Then, instead of coupling capacitor alone, you put a bit of bypass resistor across each capacitor, and feed the high terminal with one source, and the low terminal with one sink (and 'cuz it's differential, you'd have the second source and sink for the other half's capacitor).

As long as you don't dial the current up beyond what the CML sources , it'll drive a lot like a battery in series. If the HF gets too much Miller effect, a few ferrite beads can help, obviously.

You do have to know polarity of the offset required at wiring-time, but the mirrors' emitter supplies are places you can apply dynamic controls of the amplitude and range of offset.

Reply to
whit3rd

The polarity can go either way, which sure doesn't help.

In this case, I want to couple logic levels with features from maybe

50 ps to 50 years. I might grudgingly allow the two traces between chips to be half an inch long, with one sideways cap in the middle of each. That's no place for a dozen transistors or ICs. My circuit started as two floating programmable voltages across the coupling caps, and stepwise deteriorated to the simple thing I have now. The big resistors fake dueling current sources, and the dropping resistor across the cap turns out to work at infinite ohms.

There is a more general issue of splitting a signal into a number of bandwidths, transmitting, and then recombining neatly. Phil Hobbs recently needed to drive a ganfet gate with a fast-edge fairly long pulse, when the fet is riding hundreds of volts off ground. I don't know how he wound up doing that. In audio, a crossover has similar issues, bandwidth splitting.

You can buy logic isolator chips, some with isolated power, but they are terrible for fast stuff. I've many times combined a fast (cap or transformer) AC path with a slow optocoupler.

There are megabuck class oscilloscopes that split signals onto multiple paths of different bandwidths (with mixers I think) and then digitize and recombine with lots of DSP. That's the deconvolution problem.

The general problem of bandwidth splitting and combining keeps popping up. It's worth a long paper or a short book. This is a good start:

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Reply to
jlarkin

Hasn't been implemented yet. Probably something like this:

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. The Coilcraft transformer is way too clunky, so it'll either be an RC or a much lighter-weight transformer--maybe one of your coax-jumper-plus-potcore things. (The switch has to ride on top of a

-450V avalanche photodiode bias supply.)

The common-gate FET is an interesting idea I found in an app note, of all places. (I assume that means it's old hat, but I hadn't seen it before.)

The substrate diode conducts in one direction and the transistor action in the other, so the hold time is limited by the RC and not the voltseconds of the transformer. It also allows extending the hold time indefinitely by pulsing the gate driver.

I'd like to read that book!

The Tektronix 'feedbeside' thing requires really good matching between branches to get better than oscilloscope accuracy.

If the matching isn't very close, you wind up with low-frequency pole/zero pairs that don't quite cancel. That leads to settling whoopdedoos at late times, which are often super obnoxious in real applications but which will be quite invisible on a scope.

Cheers

Phil Hobbs

Reply to
Phil Hobbs

The equivalent of p/z mismatch is a problem even in logic couplers. The trick is to keep the corner freqs far apart. The AC path should have a much longer time constant than the maintaining DC path. A bit of clamping helps too.

When Tek did the 7104 1 GHz microchannel scope, they considered splitting the gain path into bandwidth zones, amplifying, and combining. But linear ICs got good enough about that time, so they used them.

Reply to
jlarkin

I'm not sure that works in general, though--you'd need one feedback loop to govern the other, and you always wind up with problems where they change roles. Making the AC time constant slow just exports the problem to late times. Some applications don't care, in which case that's a big win, but some do.

Cheers

Phil Hobbs

PS: Merry Christmas!

Reply to
Phil Hobbs

I got a beautiful set of razor sharp Wusthof knives. They slice through Tartine sourdough like a chain saw. Pay no mind to the band-aids.

I got Mo a 48" Sony oled TV. It's astonishing. It makes the old LCD look washed-out and fuzzy.

Reply to
jlarkin

It only has one resistor and capacitor in each signal wire, that other circuitry is just the power supply, carries (ideally) none of the HF signal; ferrites for blocking are... tiny, if required.

The resistor could piggyback on the capacitor, if space is that tight...

Oh, there's a lot of interesting problems; howzabout an injectable circular transmission line, so you can insert a transient signal and keep recirculating the signal past a refresh amplifier/sampler until those golden nanoseconds have had all the picoseconds nailed down in memory? You can't quite do that with a cyclotron, the electrons DO revisit regularly, but injection is always in tiny bunches...

Some of the inline amplifiers for optical fiber are suggestive, though.

Reply to
whit3rd

Got a schematic or a sim?

We have considered a circular parametric oscillator as a breed of triggered oscillator, which would be cute but complex.

Reply to
jlarkin

You could maybe use a memory element on the high side, a flipflop or a schmitt trigger or maybe even just a capacitor, and drive it from narrow positive and negative spikes through a transformer. That could be done with zero static power required on the high side.

The non-inverting schmitt case has analogies to my pulse coupler. Cap to the schmitt input, feedback resistor to sustain. Might work.

Reply to
jlarkin
[snip]

Yeah. They will dull gradually, and need whetting from time to time. What I use is a Norton double-grit waterstone and a very solid adjustable rubber clamp base so the stone doesn't slide around and/or damage the countertops.

.

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I just gave this set to a family member whose knives were essentially useless. I did the initial sharpening on two of them, and people were astonished at the difference, even though those blades were made of very soft steel. (Unlike Wusthof).

She will also be getting a polyethylene cutting board - she used to cut on ceramic plates, ruining both plate and knife.

I got a 48" Sony for my wife a few years ago, with full HD (had to upgrade COMCAST service as well). The improvement was stunning, especially for baseball and football (US) games. She also likes to watch French movies on Netflix, to improve her French.

Joe Gwinn

Reply to
Joe Gwinn

I'm looking forward to more OLEDs in instruments. They are bright, sharp, color saturated, and have great viewing angles.

Comcast gets maligned a lot, but they have been great for us. They keep upgrading speed and video quality to be competitive. I'm now getting 130+40 mbps on the basic plan, which is about as fast as anyone needs.

The pattern is that bandwidth is essentially free to the providers, so if you complain about anything they upgrade your speed to appease you. Both Comcast and Suddenlink did that for us when we had a complaint.

Reply to
jlarkin

Beware burn-in (also called printing). I avoided OLEDs for just this reason. This will eventually be fixed, but very gradually.

On your instruments, it may be necessary to have the fixed part of the display wander around a bit, like we did for CRTs, to smear out and thus reduce the visual impact of printing.

That's been the pattern in the Boston area as well. Of course, they have Verizon with Fios snapping at their heels. And vice versa.

I haven't tested that gambit here.

What's going on in New England with Verizon is that they are going to drop all analog land-line telephone service (over copper), but when asked about how long things work when the power is out, or what the achieved operational availability is, they disappear into a cloud of sales happy-talk.

For the record, the traditional holdup time is 48 hours on the central-office battery (time for the diesel generators to arrive), and five nines (0.99999).

Joe Gwinn

Cell phones don't last a day, and struggle to achieve one nine.

Reply to
Joe Gwinn

On a sunny day (Sun, 26 Dec 2021 13:17:16 -0500) it happened Joe Gwinn snipped-for-privacy@comcast.net wrote in snipped-for-privacy@4ax.com:

I second that, I replaced the OLED in my clock last month, became unreadable, segments of numbers burned in. After 7 years that is, for a TV you would want it replaced much much earlier. But I already told him that month ago. My Samsung LCD TV keeps amazing me after how many ? 9 years or so.

Yes Using a lot of those small OLED

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Cheap, about 2$50 like this:
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have some blue + yellow and some white ones, all i2c interface.

Reply to
Jan Panteltje

People tell me that they have had OLED TVs for years without problems. But TVs are pretty sophisticated and have varying images. Instruments with dumb OLEDs and fixed-position numeric displays might wear out the pixels.

If Mo's TV only looks fabulous for two or three years, I'll get her another one.

Slowly moving the image on an OLED instrument is a good idea. The viewing angle issues on LCDs can be a problem and restricts color choices. Both benchtop and rackmount instruments can be used at large vertical viewing angles, which TVs don't have.

Reply to
jlarkin

There's a requirement for 10 ns recovery from overload, which would need a reasonably-beefy driver even with GaN. In reality it's a nice-to-have and not a deal breaker, but it presented a very interesting design challenge--how do you make a capacitively-coupled APD bootstrap recover that fast, and avoid dumping the fault current straight into the bootstrap cap when the switch opens?

The APD gain is a strong function of bias, so you can't ignore that part of the problem--otherwise it'll take tens of milliseconds to recover.

And of course it all has to float at -400 to -500 volts, with minimal capacitance to ground because the local ground is being driven by the bootstrap transistor.

Fun.

Cheers

Phil Hobbs

Reply to
Phil Hobbs

congrats, John, a find choice. We've not experienced screen burn-in on the OLEDs (tho we only test them for about a week). Still, sensible to be cautious. If it gives you some comfort, Sony TVs have had very high predicted reliability and owner satisfaction scores, for many years in a row, per the CR survey results. And their OLEDs have performed excellently. (Of course, we aim for high-fidelity reproduction, turn off the image-boosting gimmicks, use the "custom" picture setting mode, and calibrate the image using CalMan setup. Luckily the model you bought has CalMan Software already built in! (XBR-48A9S) - though I dont know how they expect you to find the optical sensor.) Curious to know how you like the sound of the "Acoustic surface audio" feature (which uses the screen itself as the acoustic radiators, not conventional dynamic drivers.)

Reply to
Rich S

The sound is fabulous on the Sony OLED tv. At first powerup it calibrated itself to the room acoustics!

It has overcome a major point of marital discord. I like the sound to be loud and Mo likes it low. This tv somehow makes us both happy.

Reply to
jlarkin

On Fri, 24 Dec 2021 14:21:18 -0800, John Larkin <jlarkin@highland_atwork_technology.com> wrote:

Here is a "feed-beside" version. It works but does some tricky, barely-legal things to the CML source gate. CML gates can maybe usually swing 800 mV down from their Vcc rail and maybe a bit above.

Version 4 SHEET 1 1428 972 WIRE 448 -176 320 -176 WIRE 320 -144 320 -176 WIRE 160 -128 32 -128 WIRE 272 -128 160 -128 WIRE 448 -112 448 -176 WIRE 32 -96 32 -128 WIRE 160 -96 160 -128 WIRE 272 -80 224 -80 WIRE 320 -32 320 -64 WIRE 160 0 160 -32 WIRE 224 0 224 -80 WIRE -48 80 -112 80 WIRE 32 80 32 -16 WIRE 32 80 -48 80 WIRE 192 80 32 80 WIRE 448 80 448 -32 WIRE 448 80 256 80 WIRE 512 80 448 80 WIRE 624 80 512 80 WIRE 32 112 32 80 WIRE -112 128 -112 80 WIRE 448 144 448 80 WIRE 816 224 752 224 WIRE 864 224 816 224 WIRE -112 256 -112 208 WIRE 32 256 32 192 WIRE 448 256 448 224 WIRE 752 304 752 224 WIRE 624 320 624 80 WIRE 704 320 624 320 WIRE 704 368 624 368 WIRE 448 416 320 416 WIRE 752 432 752 384 WIRE 320 448 320 416 WIRE 160 464 32 464 WIRE 272 464 160 464 WIRE 448 480 448 416 WIRE 32 496 32 464 WIRE 160 496 160 464 WIRE 272 512 224 512 WIRE 320 560 320 528 WIRE 160 592 160 560 WIRE 224 592 224 512 WIRE -48 672 -112 672 WIRE 32 672 32 576 WIRE 32 672 -48 672 WIRE 192 672 32 672 WIRE 448 672 448 560 WIRE 448 672 256 672 WIRE 512 672 448 672 WIRE 624 672 624 368 WIRE 624 672 512 672 WIRE 32 704 32 672 WIRE -112 720 -112 672 WIRE 448 736 448 672 WIRE -112 848 -112 800 WIRE 32 848 32 784 WIRE 448 848 448 816 FLAG 32 256 0 FLAG 448 256 0 FLAG 320 -32 0 FLAG 160 0 0 FLAG 224 0 0 FLAG 512 80 Q+ FLAG -112 256 0 FLAG -48 80 CML+ FLAG 32 848 0 FLAG 448 848 0 FLAG 320 560 0 FLAG 160 592 0 FLAG 224 592 0 FLAG 512 672 Q- FLAG -112 848 0 FLAG -48 672 CML- FLAG 752 432 0 FLAG 816 224 DIFF SYMBOL res 48 208 R180 WINDOW 0 49 55 Left 2 WINDOW 3 51 25 Left 2 SYMATTR InstName R1 SYMATTR Value 50 SYMBOL cap 256 64 R90 WINDOW 0 71 30 VBottom 2 WINDOW 3 73 34 VTop 2 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL res 464 240 R180 WINDOW 0 64 62 Left 2 WINDOW 3 67 28 Left 2 SYMATTR InstName R2 SYMATTR Value 50 SYMBOL e 320 -160 R0 WINDOW 0 44 81 Left 2 WINDOW 3 44 112 Left 2 SYMATTR InstName E1 SYMATTR Value 20 SYMBOL res 432 -128 R0 WINDOW 0 48 50 Left 2 WINDOW 3 50 78 Left 2 SYMATTR InstName R3 SYMATTR Value 2K SYMBOL res 48 0 R180 WINDOW 0 59 76 Left 2 WINDOW 3 54 42 Left 2 SYMATTR InstName R4 SYMATTR Value 25k SYMBOL cap 144 -96 R0 WINDOW 0 -49 21 Left 2 WINDOW 3 -49 55 Left 2 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL current -112 128 R0 WINDOW 0 -64 101 Left 2 WINDOW 3 -56 172 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Icml SYMATTR Value PULSE(16m 0 10u 0 0 50u 100u 10) SYMBOL bi -112 720 R0 WINDOW 0 -86 52 Left 2 WINDOW 3 -164 90 Left 2 SYMATTR InstName B1 SYMATTR Value I=16m-I(Icml) SYMBOL res 48 800 R180 WINDOW 0 49 55 Left 2 WINDOW 3 51 25 Left 2 SYMATTR InstName R5 SYMATTR Value 50 SYMBOL cap 256 656 R90 WINDOW 0 71 30 VBottom 2 WINDOW 3 73 34 VTop 2 SYMATTR InstName C3 SYMATTR Value 1µ SYMBOL res 464 832 R180 WINDOW 0 62 85 Left 2 WINDOW 3 62 52 Left 2 SYMATTR InstName R6 SYMATTR Value 50 SYMBOL e 320 432 R0 WINDOW 0 44 81 Left 2 WINDOW 3 44 112 Left 2 SYMATTR InstName E2 SYMATTR Value 20 SYMBOL res 432 464 R0 WINDOW 0 48 50 Left 2 WINDOW 3 49 82 Left 2 SYMATTR InstName R7 SYMATTR Value 2K SYMBOL res 48 592 R180 WINDOW 0 59 76 Left 2 WINDOW 3 54 42 Left 2 SYMATTR InstName R8 SYMATTR Value 25k SYMBOL cap 144 496 R0 WINDOW 0 -49 21 Left 2 WINDOW 3 -49 55 Left 2 SYMATTR InstName C4 SYMATTR Value 1n SYMBOL e 752 288 R0 WINDOW 0 58 35 Left 2 WINDOW 3 65 70 Left 2 SYMATTR InstName E3 SYMATTR Value 1 TEXT 688 816 Left 2 !.tran 2m TEXT 536 736 Left 2 ;CML-CML Feed-Beside Level Shifter B1\n J Larkin Dec 27 2021 TEXT -64 232 Left 2 ;gnd1 TEXT 360 264 Left 2 ;gnd2 TEXT -64 824 Left 2 ;gnd1 TEXT 352 856 Left 2 ;gnd2

Reply to
jlarkin

On a sunny day (Mon, 27 Dec 2021 05:17:01 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in snipped-for-privacy@4ax.com:

Sony did acquire a bad name here in TV starting when the PAL system was introduced they did not want to pay for the PAL patents so basically used a NTSC type decoder, losing the advantage that PAL has no color errors. The second thing was the 'trinitron' tube that was brighter than the normal shadow mask tubes in color TVs, but had some drawbacks for example in case of vibration making support wires visible.

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a lot with the very bright hype,

That was all many years ago so maybe they changed ways. The sound of my Samsung TV is bad (acoustics), so I use external speakers or headphones, earphones.

Oh and Sony had the KV1810 TV chassis that used silicon switches_ not transistors, in the power supply and deflection too IIRC. The sets manufactured in the UK had bad solder joints that would interrupt the switch-off and kill its supply.

They make good stuff too, had a Sony tape recorder and their camera sensors are OK too.

It is a good idea to look up a lot of reviews before buying stuff.

Reply to
Jan Panteltje

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