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Old 03-02-2010, 10:59 PM #1
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Default Please help, making a driver

I'm looking for the capacitor in this diagram:

I found this 10F 16V 20% Dipped Tantalum Capacitor - RadioShack.com

Is it the same thing?

Any help is appreciated.


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Old 03-02-2010, 11:08 PM #2
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Default Re: Please help, making a driver

that will work, a simple electrolytic capacitor commonly sold for under 50 cents is what is described in the diagram.

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Old 03-02-2010, 11:46 PM #3
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Default Re: Please help, making a driver

well do you know of a place that i can get all of the things in the diagram?
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Old 03-02-2010, 11:47 PM #4
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Default Re: Please help, making a driver

also an aixiz housing
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Old 03-03-2010, 04:25 AM #5
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Default Re: Please help, making a driver

Quote:
Originally Posted by Kakashi987 View Post
well do you know of a place that i can get all of the things in the diagram?
easy! (enjoy) the Aixiz modules, search here on the forum under B/s/T several members offer them, or contact Aixiz (google the name)

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Old 03-03-2010, 04:00 PM #6
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Default Re: Please help, making a driver

or modwerx or hightechdealz, they have low prices and are very reputable on this forum
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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 03-03-2010, 09:44 PM #7
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Default Re: Please help, making a driver

Thanx for the help guys.

I have heard that instead of a driver i could just solder a capacitor directly to the diode.

Does this work?
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Old 03-04-2010, 11:06 AM #8
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Default Re: Please help, making a driver

no, you need a driver.
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Also, would a crap-load of evenly-wound aluminum duct tape work for heatsinking around the Aixiz module?
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Old 03-04-2010, 11:10 AM #9
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Default Re: Please help, making a driver

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Thanx for the help guys.

I have heard that instead of a driver i could just solder a capacitor directly to the diode.

Does this work?
absolutely not.

Surely will fry your diode quickly. Please I'm begging you, read the materials I gave you in those links, It may take a little time, but you will be so much more educated for it!! just read it.

http://laserpointerforums.com/f36/lo...-me-47684.html
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Old 03-04-2010, 11:35 AM #10
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Default Re: Please help, making a driver

K, thanks for all the help guys, should be getting my aixiz housing soon.
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Old 03-04-2010, 11:40 AM #11
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Default Re: Please help, making a driver

don't hesitate to ask for help along the way... we want you to succeed in your project.
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Old 03-05-2010, 11:26 PM #12
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Default Re: Please help, making a driver

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Originally Posted by photonaholic View Post
don't hesitate to ask for help along the way... we want you to succeed in your project.
I looked on the Radio Shack website and I can't find the variable resistor.

Do you know where I could get one, do I have to have one?

EDIT: Is this it?
Also is 18 gauge wire good to use?

Last edited by Kakashi987; 03-05-2010 at 11:51 PM.
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Old 03-06-2010, 12:09 AM #13
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Default Re: Please help, making a driver

You can use a fixed resistor in place of the pot. Decide what current that you want to run your diode at. For example, 420mA. The reference voltage of the LM317 is 1.25V. The resistor required is 1.25 / 0.42 = 2.976 ohms, you could use 3 x 1 ohm resistor in series.

The 18ga wire should be fine.

The pot in your edit is a behemoth! If you have room in your project for such a beast, go for it. Otherwise maybe use the fixed resistor.
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Old 03-06-2010, 12:22 AM #14
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Default Re: Please help, making a driver

Quote:
Originally Posted by billg519 View Post
You can use a fixed resistor in place of the pot. Decide what current that you want to run your diode at. For example, 420mA. The reference voltage of the LM317 is 1.25V. The resistor required is 1.25 / 0.42 = 2.976 ohms, you could use 3 x 1 ohm resistor in series.

The 18ga wire should be fine.

The pot in your edit is a behemoth! If you have room in your project for such a beast, go for it. Otherwise maybe use the fixed resistor.
O.K. so in addition to the two 10 ohm resistors i need a couple of other 1 ohm resistors depending on how many ma I want to run the diode at.

If i want to run the diode at 120mW how many 1 ohm resistors do I need?
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Old 03-06-2010, 12:30 AM #15
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Default Re: Please help, making a driver

According to the calculation I gave you, 1.25 / 0.12 = 10.416, so a 10 ohm resistor would do. We are talking total resistance here, the other two 10 ohm resistors in the schematic are not used as well. This calc gives you the total resistance needed.
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Old 03-06-2010, 12:35 AM #16
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Default Re: Please help, making a driver

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According to the calculation I gave you, 1.25 / 0.12 = 10.416, so a 10 ohm resistor would do. We are talking total resistance here, the other two 10 ohm resistors in the schematic are not used as well. This calc gives you the total resistance needed.
Sweet! Thanks for all the great info. Just to be sure, a dvd burner diode runs at about 120mW right?
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