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Old 05-14-2013, 08:59 PM   #91
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If they use a constant current source, it almost sounds like they ramp the PWM down, or just stop it to kill the light. If that's the case, it could be a cap discharging in the constant current driver, or just if they ramp the PWM down and something holds that ramp up from executing for a few cycles...
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Old 05-16-2013, 07:43 AM   #92
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Hi,

I've soldered a 36k ohm and it works like a charm.

Really big big thank for your feedback and help Yoq !!!!
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Old 05-16-2013, 12:47 PM   #93
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Hi,

I've soldered a 36k ohm and it works like a charm.

Really big big thank for your feedback and help Yoq !!!!
Can you post a photo?
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Old 05-18-2013, 05:18 AM   #94
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I would add a wired resistor like this:

It's not the right one though, it should be 3x orange (33k or a bit higher)
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Old 05-19-2013, 08:52 AM   #95
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It's not the right one though, it should be 3x orange (33k or a bit higher)
If we want to have more possible settings when the kobo is set in LOW brightness, must we use a lower or higher resistor (I never use high settings so I can forget this mode).
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Old 05-19-2013, 05:15 PM   #96
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Originally Posted by akorx View Post
If we want to have more possible settings when the kobo is set in LOW brightness, must we use a lower or higher resistor (I never use high settings so I can forget this mode).
A lower one, but if you go too low the LEDs will be completely dark at the lowest setting. That is why I recommend 33k. I tried 22k and it was too low, but 30k might still work.
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Old 05-19-2013, 05:31 PM   #97
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Well, what about a potentiometer? Too much big?
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Old 05-20-2013, 05:03 AM   #98
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Another question : the brightness setting seems to be 1 / 2 / 3 / etc and if I want to use 1.5, I can't... so my question : if I use a 30k ohm for example (or another value lower like 27), will it increase the number of available values ​​between the "old 1" and and the "old 2" or just change it in 3 and 4 ?

For example :

Case 1 :

Old 1 will become 3
Old 2 will become 4

=> the number of available values is not increased.

Case 2 :

Old 1 will become 3
Old 2 will become 7

=> the number of available values is increased.

???

NB : sorry if you don't understand what I want to say, it's not esay for my to explain it in english... I just wanna know if a good choice of resistor can let us access to more intermediate values in lower levels.

Last edited by akorx; 05-20-2013 at 05:49 AM.
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Old 05-20-2013, 05:47 AM   #99
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Yes, there should be finer steps with a lower resistor.

Quote:
Originally Posted by Lucas Malor View Post
Well, what about a potentiometer? Too much big?
Sure, potiometers come in all sizes.

Last edited by yoq; 05-20-2013 at 10:30 AM.
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Old 05-22-2013, 03:07 PM   #100
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Hi my friends,

I've changed the 36k ohms to a 30k and it's better, I can now use more values of brightness in lower settings and find the good one for my eyes.

Just before to close this very interesting post, do you think that a 20k should be better or it's to low (that can help other people that will it read later) ?

Last edited by akorx; 05-22-2013 at 03:09 PM.
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Old 05-23-2013, 05:50 AM   #101
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Quote:
Originally Posted by akorx View Post
Hi my friends,

I've changed the 36k ohms to a 30k and it's better, I can now use more values of brightness in lower settings and find the good one for my eyes.

Just before to close this very interesting post, do you think that a 20k should be better or it's to low (that can help other people that will it read later) ?
You MIGHT get more/finer steps with 20k, BUT at the lowest setting the light will be completely off because all the current goes into the resistor.

Last edited by yoq; 05-23-2013 at 12:46 PM.
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Old 09-23-2013, 01:24 PM   #102
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ey , hello i want to solder a resistor too! , but first one question or two;

Also hardware , what more do i need , i mean i have a kobo glo , last FW , do i have to install something to controll the brightness once i have done the circuit? i dont saying its easy because i never do it , so just wanted to know. First aff all i have to buy the things that i need, So what do you recomend 30k or 33k resistor , or ohm like akorx user, thank you.
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Old 09-23-2013, 02:24 PM   #103
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No, you don't need any software. It is simply darker on the lowest setting and the same on the highest setting:

I recommend a 33kOhm (33000 Ohm) resistor.
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Old 09-23-2013, 02:41 PM   #104
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Quote:
I recommend a 33kOhm (33000 Ohm) resistor
ok
Quote:
I would add a wired resistor like this
so i need wired resistor too? it is better ? and this should be solder between the red area with the blue area ?
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Old 09-23-2013, 02:50 PM   #105
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Just one. You can choose. The wired is easier to solder but it has the same effect. If you decide to do the wired version, solder at TP65 and at the left side of CA1.
http://www.mobileread.com/forums/sho...stcount2517671
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