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Old 04-01-2011, 09:39 AM #1
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Default Laser Driver Help. LM317K Regulator.

Hello, I am trying to make a laser driver but know very little about electronic circuits. I am trying to build this one Laser driver - It can be done but i accidentally got a 2 pin LM317K Regulator instead of the 3 pin LM317 Regulator. Does anyone know how i can wire this up using the 2 pin LM317K? Or are there any other drivers which use the same components but with the LM317K? Thank you.


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Old 04-01-2011, 04:38 PM #2
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Default Re: Laser Driver Help. LM317K Regulator.

Just look at the datasheet.

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Old 04-01-2011, 11:15 PM #3
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Default Re: Laser Driver Help. LM317K Regulator.

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Originally Posted by Cyparagon View Post
Just look at the datasheet.



So the whole base of this is an output?
This will interfere on my stripboard won't it?
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Old 04-01-2011, 11:50 PM #4
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Default Re: Laser Driver Help. LM317K Regulator.

Not any more than a regular LM317. Normally the case metal is a V-Out so you have to isolate it from your host anyway.
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Old 04-01-2011, 11:52 PM #5
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Default Re: Laser Driver Help. LM317K Regulator.

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Not any more than a regular LM317. Normally the case metal is a V-Out so you have to isolate it from your host anyway.
So when you say not anything more than an LM317 i'm assuming that an LM317T can't be used?
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Old 04-02-2011, 12:18 AM #6
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Default Re: Laser Driver Help. LM317K Regulator.

LM317T is what we pretty much ALWAYS use, so no that's not the case. T is fine.

K is fine too.

They're all fine (except the 1A or 0.5A version if you're trying for high current than that). Just isolate the case from the host.
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Old 04-02-2011, 12:22 AM #7
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Default Re: Laser Driver Help. LM317K Regulator.

Quote:
Originally Posted by rhd View Post
LM317T is what we pretty much ALWAYS use, so no that's not the case. T is fine.

K is fine too.

They're all fine (except the 1A or 0.5A version if you're trying for high current than that). Just isolate the case from the host.
Thanks. Could i put the LM317K on the underside of the stripboard (having the pins stick up to the sides of the strips and then wire the output to the pot?
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Old 04-02-2011, 12:37 AM #8
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Default Re: Laser Driver Help. LM317K Regulator.

I'd have to see pictures - but here's the bottom line:

The case of your LM317 can't touch anything else in the circuit, except for one lead from your resistor. That's it - nothing else, including the metal sides of whatever you're building this laser in.
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Old 04-02-2011, 01:03 AM #9
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Default Re: Laser Driver Help. LM317K Regulator.

I'm just wondering... Are you planning on doing a lab style build or a flashlight host type build for this driver? Because TO-3 packages are pretty large.
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Old 04-02-2011, 01:05 AM #10
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Default Re: Laser Driver Help. LM317K Regulator.

This is my first laser and time working with circuitry so i just wanna build any driver so i can say that i did and test it out.
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Old 04-02-2011, 01:12 AM #11
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Default Re: Laser Driver Help. LM317K Regulator.

Ah, ok. You should be fine then. Just follow the datasheet or picture cyparagon attached for the pin connections.
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638nm 1071 mA GUIDESMAN (AMC7135) - link
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Old 04-02-2011, 01:13 AM #12
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Default Re: Laser Driver Help. LM317K Regulator.

Okay. Thanks everyone i'll attempt this and post if successful
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