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Old 11-26-2011, 03:28 PM #1
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Default Help for linear driver

I bought this linear regulator 3 - LM350T 4.5A 1.3Vto33V,Linear Regulators | eBay
and this resistor (68 Ohm) to drive a 445 nm diode.

Can anyone help me to make the right connections?
Attached Thumbnails
Help for linear driver-resist.jpg  


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Old 11-26-2011, 04:56 PM #2
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Default Re: Help for linear driver

Quote:
Originally Posted by Arayan View Post
I bought this linear regulator 3 - LM350T 4.5A 1.3Vto33V,Linear Regulators | eBay
and this resistor (68 Ohm) to drive a 445 nm diode.

Can anyone help me to make the right connections?
Here is the Data Sheet for the LM350T. Page #1 shows
the pinout identification. It is similar to the LM317 pinouts....

http://www.fairchildsemi.com/ds/LM/LM350.pdf


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Last edited by lasersbee; 11-26-2011 at 04:57 PM. Reason: Spelling errors
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Old 11-26-2011, 05:03 PM #3
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Default Re: Help for linear driver

Thanks Jerry this is what I was looking for
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Old 11-27-2011, 07:04 PM #4
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Default Re: Help for linear driver

In your opinion it might work in this way?

Thanks again

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Old 11-27-2011, 07:06 PM #5
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Default Re: Help for linear driver

Quote:
Originally Posted by Arayan View Post
In your opinion it might work in this way?

Thanks again

Hey,

The only thing to be aware of is that your resistor (68ohms) will only result in a current of 18mA.

1.25 / 68 = 0.018 A

BTW - I haven't heard back from you via email in a while.
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Old 11-27-2011, 07:23 PM #6
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Default Re: Help for linear driver

Thanks, My intention is to obtain 1.8 A, and I don't understand why I found these instructions for a 445 nm diode.


PS: I call directly to the customs, but never responds... I think it's lost! If you want you can send me a mosquito for compensation J/K
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Old 11-27-2011, 07:29 PM #7
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Default Re: Help for linear driver

Where do you put the laser diode ? And at 1.8A you need a stronger resistor, at least 2W resistor
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Old 11-27-2011, 07:33 PM #8
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Default Re: Help for linear driver

Quote:
Originally Posted by Blord View Post
Where do you put the laser diode ?
I haven't built anything, but I did just an hypothesis (as in the figure)
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Old 11-27-2011, 07:33 PM #9
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Default Re: Help for linear driver

Its probably supposed to be .68 ohms, for ~1.8A.

According to the color code (black blue gray silver brown), it is .68 ohms.
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Old 11-27-2011, 07:37 PM #10
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Default Re: Help for linear driver

Quote:
Originally Posted by Arayan View Post
PS: I call directly to the customs, but never responds... I think it's lost! If you want you can send me a mosquito for compensation J/K
Sounds good

I only have 1W (measured, verified, real output) on hand - that cool?

I'll need you to shoot me your address again.

Cheers
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Old 11-27-2011, 07:39 PM #11
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Default Re: Help for linear driver

Quote:
Originally Posted by benmwv View Post
Its probably supposed to be .68 ohms, for ~1.8A.

According to the color code (black blue gray silver brown), it is .68 ohms.
I thought the same thing, but on ebay they have declared as 68 ohms, and I don't remember the color code, but now I'm going to review
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Old 11-27-2011, 07:45 PM #12
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Default Re: Help for linear driver

Quote:
Originally Posted by rhd View Post
Sounds good

I only have 1W (measured, verified, real output) on hand - that cool?

I'll need you to shoot me your address again.

Cheers
Thanks, I truly appreciate this...you have a mail
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Focusable 150 mW, 532 nm
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2 mW, 594 nm, Laserglow Rigel-2 SOLD
380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
<400 mW (220 mW) 808 nm Armlaser
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Old 11-27-2011, 07:57 PM #13
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Default Re: Help for linear driver

I was about to comment on the incorrect size and position of the pot, but then I realized you were pretending it was a laser diode
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Old 11-27-2011, 08:19 PM #14
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Default Re: Help for linear driver

Quote:
Originally Posted by Cyparagon View Post
I was about to comment on the incorrect size and position of the pot, but then I realized you were pretending it was a laser diode
ok, maybe it could be better this way
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Old 11-27-2011, 08:27 PM #15
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Default Re: Help for linear driver

Here is a clearer drawing of the Current regulated circuit..
Just change the Resistor Values to what you require...
The LM350 has the same pinouts....




Jerry
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Old 11-28-2011, 04:15 PM #16
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Default Re: Help for linear driver

Quote:
Originally Posted by lasersbee View Post
Here is a clearer drawing of the Current regulated circuit..
Just change the Resistor Values to what you require...
The LM350 has the same pinouts....




Jerry
Thanks Jerry, but there are too many components to be inserted into a host

BTW I measured the resitor with a tester: 0.7 ohms
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Focusable 150 mW, 532 nm
5 mW, 532 nm, Laserglow Anser
2 mW, 594 nm, Laserglow Rigel-2 SOLD
380 mW, 635 nm, the Copperhead by Wolfman Link
170 mW, 650 nm from jeffreythe00 Link
double beam pointer <5 mW, 650 nm ; 532 nm, Z-Bolt
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