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Yamakasi Catleap Q270 (100hz guaranteed). - Page 83  

Poll Results: Would you be interested in buying a Yamakasi Catleap Q270 (100hz guarenteed)

 
  • 87% (726)
    Yes
  • 2% (18)
    No
  • 10% (88)
    Maybe
832 Total Votes  
post #821 of 1131
Quote:
Originally Posted by siberx View Post

Do you actually have one of these monitors and have you examined its backlight and found it to be lacking? I own one and observe no flicker problems whatsoever, which is corroborated by my analysis of the backlight driver circuit. They're using a 330kHz current-controlled boost converter (two of them, in fact - half the LEDs run off each) to drive the backlighting; this results in no visible flicker whatsoever. There's some concern that their choice of circuit for controlling the brightness setting allows for some unevenness between each side of the monitor (one boost converter drives two-thirds of the LEDs on one half and one-third of the LEDs on the other), but other than this (which can be fixed with a mod) the backlighting seems fairly well implemented from a flicker prevention perspective.
Earlier posts of mine indicate some flicker around 150Hz or so; I suspect this is some oscillation in the output circuit, and the slight variance in brightness from this (not a full on/off cycle) is not visible at all even to my fairly flicker-sensitive eyes (hand wave test included).

It depends. Is the constant-current driver operating at constant current over many cycles or is it operating at constant current *while on*? I suspect the latter, with pwm dimming turning on and off the whole supply at a much lower frequency. If I had a catleap, I'd take it apart and probe it tongue.gif.
post #822 of 1131
Quote:
Originally Posted by cirthix View Post

It depends. Is the constant-current driver operating at constant current over many cycles or is it operating at constant current *while on*? I suspect the latter, with pwm dimming turning on and off the whole supply at a much lower frequency. If I had a catleap, I'd take it apart and probe it tongue.gif.

Your suspicion is incorrect, as the brightness control works by injecting some current (an analog level sourced from a DAC pin on the microcontroller on the DVI board) into the feedback of the PWM driver chip (INN), forcing it to back off some to reduce brightness from its maximum. The only periodic signals my scope detected in the backlight circuit was the 330kHz boost frequency.

There's a chance I missed something, but this is my current understanding and analysis of the circuit.
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Monolith
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post #823 of 1131
Quote:
Originally Posted by siberx View Post

Your suspicion is incorrect, as the brightness control works by injecting some current (an analog level sourced from a DAC pin on the microcontroller on the DVI board) into the feedback of the PWM driver chip (INN), forcing it to back off some to reduce brightness from its maximum. The only periodic signals my scope detected in the backlight circuit was the 330kHz boost frequency.
There's a chance I missed something, but this is my current understanding and analysis of the circuit.

awesome biggrin.gif

looking forward to the catleap oc edition even more now
post #824 of 1131
The deal is done?? ****, just ordered a Shimian couple of days ago.

Will still follow this smile.gif
post #825 of 1131
Glad I found this thread. I've been waiting for something like this ever since my beautiful FW900 died. Assuming the price isn't insane (and it sounds like it won't be) I definitely want one. Heck I might even consider buying 2. Would have to buy a new desk though, lol. Can't wait to hear more! thumb.gif
Edited by vafan13 - 4/11/12 at 5:58pm
post #826 of 1131
Quote:
Originally Posted by Stab View Post

The deal is done?? ****, just ordered a Shimian couple of days ago.
Will still follow this smile.gif

OP needs to be updated, but last update was that the seller has convinced the mfg to build the monitor. We are looking at about a month before the production run results in any sell able monitors. At that point the OP will post a link to the seller. Intermediate updates might be the specific specs and production schedule details.
post #827 of 1131
Quote:
Originally Posted by bQvle View Post

smile.gif good for you, this is not an April fool!
Well, Thursdays meeting, they agreed that they would make these! What Im waiting for is, final Specs + price + Link where you can buy!
It will take about 1 month to manufacture!
the guy called "somethng" who is also posting, is my contact. So he is reading everything you suggest aswell!

From the OPs 4/10/2012 post, the manufacturer agreed on 4/5/2012 to make a batch of higher refresh rate monitors. If the manufacturer started last week and it takes about a month, it would seem like the product would be available early May in the best case scenario. I am in for at least one depending on final pricing.
post #828 of 1131
Can someone tell me if I can buy 3 of these monitors and use them in NVidia Surround with a single GTX 680? If its possible and price is close to $400 a piece I'm in for 3 monitors.
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post #829 of 1131
I still have a few questions regarding eyefinity and 3 of these monitors and the connections needed for 100-120hz

My ideal setup is 3 catleaps in surround/eyefinity running at 120hz.

is the 7970 limited to 85hz ?

can Nvidia gtx 860 SLI 3 x 2560x1440 @ 100hz-120hz ?


On a 7970 you have 1 DVI-D, 2 mini and 1 hdmi. what connectors do i use to go about setting up eyefinity on 3 2560x1440 @ 85hz and would you need 2 of these rated at 120hz ?

http://www.amazon.com/StarTech-com-MDP2DVID-DisplayPort-Dual-Link-Adapter/dp/B004I6L6DW/ref=dp_return_2?ie=UTF8&n=172282&s=electronics



With the Asus 7970 direct CU II card i think it has 4 x display ports, are any connectors needed ?
post #830 of 1131
Quote:
Originally Posted by Desert Rat View Post

Can someone tell me if I can buy 3 of these monitors and use them in NVidia Surround with a single GTX 680? If its possible and price is close to $400 a piece I'm in for 3 monitors.

http://www.galaxytech.com/__en_gb__/Landingpage/3Dsurround.html

Says it can do 3x 2560 monitors on a single card, you would need a DP to DL-DVI adapter (active, probably should be a powered one for ~$100).

Also, you wouldn't be able to push 120Hz. DP is still limited to about 100Hz IIRC. I can almost guarantee the card would explode if you tried to run all of them at 120Hz, lmao.
Quote:
Originally Posted by pitty View Post

I still have a few questions regarding eyefinity and 3 of these monitors and the connections needed for 100-120hz
My ideal setup is 3 catleaps in surround/eyefinity running at 120hz.
is the 7970 limited to 85hz ?
can Nvidia gtx 860 SLI 3 x 2560x1440 @ 100hz-120hz ?
On a 7970 you have 1 DVI-D, 2 mini and 1 hdmi. what connectors do i use to go about setting up eyefinity on 3 2560x1440 @ 85hz and would you need 2 of these rated at 120hz ?
http://www.amazon.com/StarTech-com-MDP2DVID-DisplayPort-Dual-Link-Adapter/dp/B004I6L6DW/ref=dp_return_2?ie=UTF8&n=172282&s=electronics
With the Asus 7970 direct CU II card i think it has 4 x display ports, are any connectors needed ?

You and me both thumb.gif

The 7970 is limited for now because the software to overclock hasn't been updated to support the 7000 series. AMD support has argued with me that it can do 2560x1440 @ 120Hz via both DP and DL-DVI, but I'm trying to get them to admit it won't.

680 Tri-SLI would be the only way to achieve 100Hz across all the displays simultaneously, but I think they're coded to shut the pixel clock rate down when they are ran in SLI rolleyes.gif

On 7970, you would run a DVI and two DP -> DL-DVI adapters ($100 each). With the CU II, you would need the same adapters because one DVI is DL and the other is SL.

(Yes that adapter is exactly what you need)
Edited by TheJesus - 4/11/12 at 7:38pm
     
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