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Old 03-21-2010, 07:20 PM #1
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Default Buildind my first DDL Driver

Hey guys am trying to build my first driver..i id some reading on them and i would just like someone to help me confirm that these are the right pats to use, thank you..

LM317

Variable 100 omh resistor

1N4001 Diode

10mf 16v Capacitor
Im not sure if this surfae mount is the best...

And well as for the 10ohm Resistors i have two of those from radioshake already..im from trinidad thats why i choose ebay, if anyone has advice on buying this from somewhere else please let me know...


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Old 03-21-2010, 07:47 PM #2
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Default Re: Buildind my first DDL Driver

Yes, these are the right parts to use. However the resistor you need is determined by a formula: R = 1.25 / desired_current_in_A. So it depends on what current you want. For example: for 400mA, you would need 1.25/0.4 = 3.125 ohms.
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Old 03-21-2010, 09:21 PM #3
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Default Re: Buildind my first DDL Driver

Unless you have experience in smd components and have to have small build then go for a standard radial electrolytic type capacitor, save yourself some trouble!

Good luck
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Old 03-21-2010, 10:40 PM #4
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Default Re: Buildind my first DDL Driver

Quote:
Originally Posted by jaycey View Post
Unless you have experience in smd components and have to have small build then go for a standard radial electrolytic type capacitor, save yourself some trouble!

Good luck
Without the right tools and equipment, SM is a real pain in the @ss.
As jaycey stated, go with the standard PCB thru-hole components.
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Old 03-22-2010, 12:57 AM #5
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Default Re: Buildind my first DDL Driver

Quote:
Originally Posted by x90z75ek View Post
Yes, these are the right parts to use. However the resistor you need is determined by a formula: R = 1.25 / desired_current_in_A. So it depends on what current you want. For example: for 400mA, you would need 1.25/0.4 = 3.125 ohms.
Thank you for your reply, but i dont quite understand what you mean...is this the variable resistor you are talking about? can you please explain this to me again...sorry to me subborn...

Quote:
Originally Posted by jaycey View Post
Unless you have experience in smd components and have to have small build then go for a standard radial electrolytic type capacitor, save yourself some trouble!

Good luck
Thank you for your reply, i know smd components are stress to deal with but the thing is thats all i could fid on ebay that would ship to trinidad..can you point me to another seller that would ship to me?

Quote:
Originally Posted by Greenmechanic View Post
Without the right tools and equipment, SM is a real pain in the @ss.
As jaycey stated, go with the standard PCB thru-hole components.
Thank you for your reply, do you know where i can get it?
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Old 03-22-2010, 06:03 AM #6
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Default Re: Buildind my first DDL Driver

Your variable resistor is fine, the 10ohm resistors you allready have is whats determins your MAX output (mah) so you vary this resistor to suit your diode.

EXAMPLE: 1 x 10ohm resistor will give you a max output of 125mah which is good for a PHR 803t bluray diode (although they have been known to die at this output) 80-90mah is safe.

So if you have maybe a LOC Red this will need a safe output of around 400mah, to get this you will need a resistor around 3ohm, probably giving you a max of around 500mah (cant do the exact maths right now!)


The capicitor value is not critical, you need to have a voltage value of at least twice your input power, so if you are using a 9v power supply, go for at least an 18v capicitor etc...
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Old 03-25-2010, 07:10 PM #7
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Default Re: Buildind my first DDL Driver

Quote:
Originally Posted by jaycey View Post
Your variable resistor is fine, the 10ohm resistors you allready have is whats determins your MAX output (mah) so you vary this resistor to suit your diode.

EXAMPLE: 1 x 10ohm resistor will give you a max output of 125mah which is good for a PHR 803t bluray diode (although they have been known to die at this output) 80-90mah is safe.

So if you have maybe a LOC Red this will need a safe output of around 400mah, to get this you will need a resistor around 3ohm, probably giving you a max of around 500mah (cant do the exact maths right now!)


The capicitor value is not critical, you need to have a voltage value of at least twice your input power, so if you are using a 9v power supply, go for at least an 18v capicitor etc...
Thank you! i totally understand now, but i would be using a digital multimeter to set my output, so i was planning on letting the total output be as high as i can get it so that i would be able to have a greater range on settings using the same driver...is this a good idea or not? thanks for the advice..
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Old 03-25-2010, 07:21 PM #8
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Default Re: Buildind my first DDL Driver

No harm in doing that, make sure you use a test load when you set your current.

The only difference being that your pot will get more sensitive as you increase the max potential output.
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Old 03-25-2010, 09:06 PM #9
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Default Re: Buildind my first DDL Driver

You should forget the potentiometer,
and simply use one fixed resistor to set one current to run your laser at.

No point in havinga pot, you will simply overshoot the current and kill your laser diode.
X-zek explained nicely in #2 post.

If someone told me I don't need the damn potentiometer, I would not have around 30 red laser diodes body count.
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Old 03-26-2010, 04:37 AM #10
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Default Re: Buildind my first DDL Driver

Quote:
Originally Posted by jaycey View Post
No harm in doing that, make sure you use a test load when you set your current.

The only difference being that your pot will get more sensitive as you increase the max potential output.
Thanks for the advice, can you please explain why i need a test load and what i should use? Thanks..

Quote:
Originally Posted by Eudaimonium View Post
You should forget the potentiometer,
and simply use one fixed resistor to set one current to run your laser at.

No point in havinga pot, you will simply overshoot the current and kill your laser diode.
X-zek explained nicely in #2 post.

If someone told me I don't need the damn potentiometer, I would not have around 30 red laser diodes body count.
Do you have a diagram of this circuit without the pot? can you send me a link? thank you..
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Old 03-26-2010, 07:25 AM #11
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Default Re: Buildind my first DDL Driver

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Originally Posted by Last One Left View Post
Do you have a diagram of this circuit without the pot? can you send me a link? thank you..
Just replace the 2x 10 ohm and potentiometer , with one single resistor that you calculate are x-zek in post #2 explained.
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Old 03-26-2010, 02:48 PM #12
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Default Re: Buildind my first DDL Driver

A test load simulates having a laser diode attached to your driver to enable you to accurately set your output current.

For a red diode you use 4 1N40001 diodes for a bluray 6 1N4001 diodes & a 1ohm resistor.

Heres a diagram


You only need to use a test load & measure your output if you are going to use the circuit with a variable resistor (pot)

Thanks to our old friend Rog for the diagram.
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Old 03-26-2010, 03:22 PM #13
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Default Re: Buildind my first DDL Driver

Theres some pictures here of a driver I built, may give you some idea of how it goes together.

DIY Homemade laser diode driver
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Old 03-26-2010, 05:43 PM #14
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Default Re: Buildind my first DDL Driver

Quote:
Originally Posted by jaycey View Post
Theres some pictures here of a driver I built, may give you some idea of how it goes together.

DIY Homemade laser diode driver
That is quite large, try this:



It is LM1117 chip, everything is exactly the same except that Vdrop of the IC is only half of 317.
What you are seeing here is a driver used is my first bluray pen build, run off 2x 10440.
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Old 03-27-2010, 07:30 AM #15
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Default Re: Buildind my first DDL Driver

Guys you are totally awesome!! I love this forum
So i decided to go with the driver without the pot since i have a good feeling i would turn the pot to high and blow my diode..
I went out today to look for the parts and these are all i can find..
LM317
1N4003......I know its suppose to be 1N4001 but the girl there said that its the same, can anyone tell me if this is true?
3.3 1/2watt resistor........Whats the purpose of 1 Watt or half Watt?
Im using an open can red laser, so with 3.3 resistor i shoud get about 378mA output, that should be good right? please give me any advice that you all think i might need, and thanks again..
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Old 03-27-2010, 08:01 AM #16
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Default Re: Buildind my first DDL Driver

Lets not show someone how to "run before they can walk"

My driver was large to illustrate to people who have not put one together before how it "can" be done.

I dont think someone new to electronics is going to grab a handfull of SMD components and put together one of those.

Nice little driver btw




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That is quite large, try this:



It is LM1117 chip, everything is exactly the same except that Vdrop of the IC is only half of 317.
What you are seeing here is a driver used is my first bluray pen build, run off 2x 10440.
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