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DONE *** Feb. 9, 2008 NEW BluRay GB... *** D
- Thread starter Daedal
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IgorT
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Re: Feb. 9, 2008 NEW BluRay GB...
Daedal,
How is the GB progressing? Have all the payments been made?
Daedal,
How is the GB progressing? Have all the payments been made?
Re: Feb. 9, 2008 NEW BluRay GB...
Why put the pot in series? Then you cannot overdrive it. I say put it in parallel, 33 ohm resistor seems safe enough to be in parallel with a 100 ohm pot (resistance up all the way of course). Or are my calculations all wrong.
amkdeath said:
Why put the pot in series? Then you cannot overdrive it. I say put it in parallel, 33 ohm resistor seems safe enough to be in parallel with a 100 ohm pot (resistance up all the way of course). Or are my calculations all wrong.
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Re: Feb. 9, 2008 NEW BluRay GB...
I use a 15 ohm resistor and a 100 ohm pot in series. It gives me a range form 10ma to 83ma.
I use a 15 ohm resistor and a 100 ohm pot in series. It gives me a range form 10ma to 83ma.
amkdeath
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Re: Feb. 9, 2008 NEW BluRay GB...
Why put the pot in series? Then you cannot overdrive it. I say put it in parallel, 33 ohm resistor seems safe enough to be in parallel with a 100 ohm pot (resistance up all the way of course). Or are my calculations all wrong.[/quote]
why would you do that? either put the pot in series, that is to turn down the mA and make it weaker (useful for high powered reds, etc.) or, just dont use a pot at all. you could also use ONLY a pot, and set the pot to 33ohms and not touch it (not recommended unless you know what you are doing, as this could cause you to kill your diode)
aaronX987 said:
Why put the pot in series? Then you cannot overdrive it. I say put it in parallel, 33 ohm resistor seems safe enough to be in parallel with a 100 ohm pot (resistance up all the way of course). Or are my calculations all wrong.[/quote]
why would you do that? either put the pot in series, that is to turn down the mA and make it weaker (useful for high powered reds, etc.) or, just dont use a pot at all. you could also use ONLY a pot, and set the pot to 33ohms and not touch it (not recommended unless you know what you are doing, as this could cause you to kill your diode)
amkdeath
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Re: Feb. 9, 2008 NEW BluRay GB...
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less.
FireMyLaser said:
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less.
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Re: Feb. 9, 2008 NEW BluRay GB...
hi DDL how much is your Bluray LD? How much power it puts out? how much in all if you send it here in the philippines, thanks.
hi DDL how much is your Bluray LD? How much power it puts out? how much in all if you send it here in the philippines, thanks.
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Re: Feb. 9, 2008 NEW BluRay GB...
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less. [/quote]
Can the pot handle that? It is 0.5W of power.
amkdeath said:
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less. [/quote]
Can the pot handle that? It is 0.5W of power.
amkdeath
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Re: Feb. 9, 2008 NEW BluRay GB...
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less. [/quote]
Can the pot handle that? It is 0.5W of power.[/quote]
it sure does handle it!
FireMyLaser said:
I usually do a 3 ohm in series with a multi turn 100ohm pot. This gives me anywhere from 420mA, to like 12mA
so its basically a universal driver, 420mA for 280mW open can, 350mA for normally run open can, 250 for 16x red, 200 for windowless IR, 38mA for blu-ray, and basically any diode that needs 420mA or less. [/quote]
Can the pot handle that? It is 0.5W of power.[/quote]
it sure does handle it!
IgorT
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Re: Feb. 9, 2008 NEW BluRay GB...
Resistance in parallel is calculated like this: R = 1/(1/R1 + 1/R2 + 1/R3 + ... + 1/Rn).
To make it easier, you can use this page: http://www.1728.com/resistrs.htm
With the 317 driver, when you use a pot and resistor in series, the resistor sets the maximum current (if the pot should be at 0), and the pot adjusts it.
You can still get any current you want with it, as long as you choose the correct resistor.
If you were to put a 33 Ohm resistor in parallel with a 100 Ohm pot, at the maximum pot seting, the combined resistance would be 24.8 Ohms (50mA minimum current through the LD), and zero Ohms (>1A through the LD), at the pot's lowest setting. I don't think, this would be a healthy setup for a Blue Ray. It would be overdriven all the time, and most likely die very soon. It wouldn't be safe even for an open can, since there is no max current limit this way.
aaronX987 said:
Resistance in parallel is calculated like this: R = 1/(1/R1 + 1/R2 + 1/R3 + ... + 1/Rn).
To make it easier, you can use this page: http://www.1728.com/resistrs.htm
With the 317 driver, when you use a pot and resistor in series, the resistor sets the maximum current (if the pot should be at 0), and the pot adjusts it.
You can still get any current you want with it, as long as you choose the correct resistor.
If you were to put a 33 Ohm resistor in parallel with a 100 Ohm pot, at the maximum pot seting, the combined resistance would be 24.8 Ohms (50mA minimum current through the LD), and zero Ohms (>1A through the LD), at the pot's lowest setting. I don't think, this would be a healthy setup for a Blue Ray. It would be overdriven all the time, and most likely die very soon. It wouldn't be safe even for an open can, since there is no max current limit this way.
amkdeath
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Re: Feb. 9, 2008 NEW BluRay GB...
Sorry :-[
I don't know where my mind is.
Its been a couple of months since I made my own.
I forgot that blue ray consume more than the red 16X.
Thanks[/quote]
actually blu-ray consumes less than half of the power of a red. it needs more voltage though...
aaronX987 said:
Sorry :-[
I don't know where my mind is.
Its been a couple of months since I made my own.
I forgot that blue ray consume more than the red 16X.
Thanks[/quote]
actually blu-ray consumes less than half of the power of a red. it needs more voltage though...
IgorT
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Re: Feb. 9, 2008 NEW BluRay GB...
No need to apologize for anything. I just tried to answer your question about the calculations.
Otherwise, the resistor in parallel with the pot would change it's behavious in a way, that can be usefull sometimes.
If you were to put an additional resistor in series with the parallel pair, to limit the max current, turning the pot would produce much smaller changes in the beginning. Towards the end, the resistance would drop almost instantly tho. For this, the values of the pot and resistor in parallel would have to be different (higher), to make it safe.
It's the same as a logarithmic pot this way (instead of linear). But with a multiturn you can make very small adjustments anyway, and it's much safer, if the behaviour is linear.
I usually use resistors in parallel, when i need some very low resistance with a weird value. You can get pretty much anything this way if you choose the correct ones.. The site i linked to helps with this.
aaronX987 said:
No need to apologize for anything. I just tried to answer your question about the calculations.
Otherwise, the resistor in parallel with the pot would change it's behavious in a way, that can be usefull sometimes.
If you were to put an additional resistor in series with the parallel pair, to limit the max current, turning the pot would produce much smaller changes in the beginning. Towards the end, the resistance would drop almost instantly tho. For this, the values of the pot and resistor in parallel would have to be different (higher), to make it safe.
It's the same as a logarithmic pot this way (instead of linear). But with a multiturn you can make very small adjustments anyway, and it's much safer, if the behaviour is linear.
I usually use resistors in parallel, when i need some very low resistance with a weird value. You can get pretty much anything this way if you choose the correct ones.. The site i linked to helps with this.
Kenom
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Re: Feb. 9, 2008 NEW BluRay GB...
I myself was curious about this very same thing. Hopefully paid in short order.
I myself was curious about this very same thing. Hopefully paid in short order.
