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Old 06-13-2012, 11:43 PM #33
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Default Re: Help with multi LM317 in parallel

Quote:
Originally Posted by Cyparagon View Post
Give them a break. Resistors are expensive.

oh, wait...


So if the LEDs are in a 3 in series, multiple in parallel, it's ok as long as each series has a resistor to protect that mini strand?


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Old 06-13-2012, 11:46 PM #34
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Default Re: Help with multi LM317 in parallel

Quote:
Originally Posted by Bionic-Badger View Post
It's a great opportunity to stock up on parts too. I especially like those quantity deals where the quantity price breaks are actually less than 50% of the previous price like this. Just $9 for 1000! Less than 1 cent per resistor! They used to charge me 5 cents for two at the labs!
I have been ordering all my electronics pieces from this place. Resistors usually are already a penny a piece, no bulk necessary.
1.2 OHM 1/4W 5% Carbon Film Resistor
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808nm 20watt - watercooled
20X 650nm Cheapy Home Depot 9led conversion - My first ever build using Rkstr driver.
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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!
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Old 06-14-2012, 08:35 PM #35
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Default Re: Help with multi LM317 in parallel

Cool, I'll have to remember that site. Though buying in bulk might just be an excuse for me to get a bunch of resistors.
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Old 06-14-2012, 09:12 PM #36
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Default Re: Help with multi LM317 in parallel

Another thing you may consider is to just buy an LED driver so that you change the brightness as you want. For example, you can use the TLC5940 driver chip and modulate the brightness with its 12-bit PWM.

Also with regards to the LM317: unless you REALLY have a power supply that is erratic, you might just forego the voltage regulator and use the LEDs and current-limiting resistors directly. Most switching power supply wall warts are pretty stable as-is, and voltage instabilities will be spread across many LEDs and the resistor. Plus, you can fit in another LED or two on the strand since you won't need 3-4V for the voltage regulator itself.

Also make sure that your current-limiting resistors match the overall forward voltage drop of the LEDs you're using in the particular strand. Some have voltage drops as low as 1.7V each, others maybe 2-3V. If you're using a driver like the TLC5940, where you don't use current-limiting resistors on each strand, you can put regular diodes in series to drop voltage if needed.
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Old 06-15-2012, 04:55 AM #37
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Default Re: Help with multi LM317 in parallel

I was thinking of using a PC PSU which are very stable, so I'm thinking I may not need the LM in the circuit at all... just a good pot and the resistor->LED->LED strings in parallel should be ok.

just wonder if those RGB led strips can be controlled separately with one control box or if I need 3 different boxes... ? Anyone know?
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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
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GB Closed for now Click "LASER SHIRTS" to see the latest run!
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Old 06-15-2012, 05:03 AM #38
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Default Re: Help with multi LM317 in parallel

I think the box has to be made for RGB and have 3 channels.
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Old 06-15-2012, 05:21 AM #39
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Default Re: Help with multi LM317 in parallel

All the RGB LED strips I've had have a resistor for EACH LED. Only 1 resistor for the entire string is stupid.

If you buy the one I linked back, it has individual resistors per LED. You can hook a few strips up to the same controller, but be careful of the current. Each controller can handle about 15 metres total.

You will need 1 controller for each string if you want to be able to change all their colours separately. You can buy the controllers separately for about $3.
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Old 06-17-2012, 05:48 AM #40
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Default Re: Help with multi LM317 in parallel

I think I'll just get the one controller for now and eventually play around with making some sort of custom controls out of an arduino and PWM

Thanks for the input everyone.
__________________
[ | | ]--------------------------------------------------
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

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