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Old 03-19-2015, 12:29 PM #1
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Default Looking for a new hobby. I could use a little help getting started if you don't mind

I have 0 experience with lasers. I'm fairly experienced with electronics. I've built plenty of circuits, but most of my knowledge is on the practical side of things. I usually just learn enough to stay safe. I've been reading threads here for a couple of hours, so I'm just barely starting to understand the concepts.

Anyway, I'm planning to build a laser. My plan for the battery is either 2 18500s in series or 1 18650. I also plan to build as much of it as possible. I'm hoping I'll be able to build everything but the diode and lens. Is this going to be possible? From what I've gathered, I need a power source, regulator, diode, heatsink and lens. Am I missing anything?

I'm having a hard time figuring out the appropriate regulators I might need for either 3.7-4.2v or 7.4-8.4v. When calculating mA output for a LM317 for example, how does input voltage affect the output? How can I find the output mA for a fixed input voltage?

For the diode, I know I should start out with visible light. Other than that, I don't really know. Should I just start with ripping out diodes from dvd drives?

Anyway, sorry for all of the noob questions. I appreciate any help or suggestions anyone has to offer. Sorry if this isn't an appropriate section.


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Old 03-19-2015, 01:29 PM #2
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

You lose 3v with the LM317 as its voltage drop. So, figure your required voltage plus an extra 3v. To achieve a particular mA output, you take 1.25 and divide it by your desired mA output, and that will give you the ohm of resistor you must use. For example if I want 125mA, I would take 1.25 and divide it by .125mA and get a 10ohm resistor. I hope this helps. Also WELCOME TO LPF!!!

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Last edited by Nute; 03-19-2015 at 01:33 PM.
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Old 03-19-2015, 11:59 PM #3
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

I hear gardening is a great hobby this time
of year. Spring will be on the way soon,
so now is the time to think about starting
growing. I have some soil and a few seeds
if you need some.

seed = diode
soil = driver

Seriously, though, start reading through the
stickies.
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Old 03-20-2015, 09:15 AM #4
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

can you please make an 'intro' thread in the welcome section?? read those from other new members to get the idea of an intro also its rather important that you fill in all your profile including general location and DOB.

We prolly have a member not far away and hands-on help is the best- plus you may find a member with an LPM and we all meter lasers free.

yeah ...read the stickies at the top of most sections-- place your Qs in the proper section )AFTER your search) and avoid double posting--

I have a +6 rep bump if you follow through--welcome from texas
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Old 03-20-2015, 03:29 PM #5
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

Quote:
Originally Posted by Nute View Post
You lose 3v with the LM317 as its voltage drop. So, figure your required voltage plus an extra 3v. To achieve a particular mA output, you take 1.25 and divide it by your desired mA output, and that will give you the ohm of resistor you must use. For example if I want 125mA, I would take 1.25 and divide it by .125mA and get a 10ohm resistor. I hope this helps. Also WELCOME TO LPF!!!

-Nute
You mean 1.25 V / .125 A, right? not .125 mA. Just want to make sure we don't confuse him too early.

If you're using an LM317, don't expect much output with one lithium ion cell. at 4.2 V nominal, you can lose up to 3V ( I think 1.5V drop is the spec...), giving you only 1.2V MAXIMUM. You will need two cells to power anything well... If you haven't got Ohm's law down, memorize and study that one. It will make building your drivers a lot funner (since you'll understand what it's doing and why you can't push 3A out of one cell! )

Power P in Watts
Voltage V in Volts
Current I in Amps
Resistance R in Ohms

P = V * I
V = R * I
I = V / R
R = V / I

am I missing anything? Just remember, even if a power source is "capable" of high current output, if you don't have enough voltage, your current will be limited.

Welcome to the forums!
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A140 445nm 1.4W 3-element glass lens | custom Quassimoto host (twin) | home-made LM317 driver | Radiant X4 LPM
A140 445nm 1.0watt custom Quassimoto host(twin) with 445/405 driver
M140 445nm 1.4watt custom everything
M140 445nm 1.4watt custom everything, mounted in walking staff
M140 445nm 1.8watt custom sink/module/driver in Ultrafire 504B with Extension Tube

405nm BluRay Player - Dead <5mw
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DBD Style 34: 190-534nm, 790-1090nm OD7+ 22% VLT
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Last edited by dethlore; 03-20-2015 at 03:36 PM. Reason: Added some simple Ohms stuff
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Old 03-20-2015, 07:41 PM #6
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

How to use LM317 driver:




BTW you're missing a "host" from your list of needed items.

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Old 03-20-2015, 07:54 PM #7
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dethlore dethlore is offline
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Default Re: Looking for a new hobby. I could use a little help getting started if you don't m

Yeah ^^^ that.
Thanks Eudaimonium! That should be simple enough to get anyone started.

Only thing I should point out is the 6 diodes in series is for Blu-Ray diodes. You only want to use 4 diodes for the test load for the red dvd burners and the blue ones. Right? ...technically, you shouldn't need a test load anyways if you know what parts to use and you have it set up right... better safe than sorry though.

SmexyPenguin, I started with ripping out a diode from a dvd burner. If it's just a reader, it won't be very powerful... but that might be a good start. I would honestly start with a burner diode though. It's super satisfying to get your first diode set up and have it burn something. Make very sure you get some proper eye protection before you even get the diode. There are some very affordable options out there.
__________________
[ | | ]--------------------------------------------------
lasers
808nm 20watt - watercooled
20X 650nm Cheapy Home Depot 9led conversion - My first ever build using Rkstr driver.
18X 650nm rifle mounted custom module
- in progress
A140 445nm 1.4W 3-element glass lens | custom Quassimoto host (twin) | home-made LM317 driver | Radiant X4 LPM
A140 445nm 1.0watt custom Quassimoto host(twin) with 445/405 driver
M140 445nm 1.4watt custom everything
M140 445nm 1.4watt custom everything, mounted in walking staff
M140 445nm 1.8watt custom sink/module/driver in Ultrafire 504B with Extension Tube

405nm BluRay Player - Dead <5mw
protection
OEM Laser Systems
DBD Style 34: 190-534nm, 790-1090nm OD7+ 22% VLT
ARG Style 56: 180-532nm OD7+ 48% VLT
Generic
Cheap Chinese for Red Wavelengths
GB Closed for now Click "LASER SHIRTS" to see the latest run!
LASER SHIRTS

OEM Laser Systems Certified Goggles - Protect your eyes!
www.oemlasersystems.com

www.reubart.com

Last edited by dethlore; 03-20-2015 at 07:55 PM.
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