Old 08-24-2010, 06:52 AM #65
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

My hope is that a diode and capacitors will straiten it out enough for a LM317 to regulate the current reliably.


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Old 08-24-2010, 11:30 AM #66
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

^ Yes, I hope so. +1 for giving it a try. It would be another interesting design posted here if it works. You prefer AA/AAA alkaline instead of using lithium ion rechargeable batteries, because your host requires them for their size?

New update on my labby. It is running at ~1350mw, and is very bright. I put a 25 ohm 50 watt in parallel to one of my 3 ohm 50 watt resistors, to reduce the dropping voltage, for the load. That was not nearly enough, so I added an 8 ohm 20 watt in parallel with the other 3 ohm 50 watt voltage dropping resistor. This finally allowed my "crazy" 7 x ddl driver circuit to achieve the power I wanted to run the 445 at. The lm317's are slightly warm, and the 3 ohm dropping resistors are a bit hot after 5 minutes, so even though they are rated for 50 watts, I will heat sink them. 1350mw is a slightly risky power level, but possibly will achieve some longevity for the LD. I'm going to create a simple tunnel effect with a "dental" first surface mirror and a Radio Shack motor, with the mirror at ~92 degrees. I'll post a pic once I have done it. ;-)
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Old 08-24-2010, 12:24 PM #67
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

Quote:
You prefer AA/AAA alkaline instead of using lithium ion rechargeable batteries, because your host requires them for their size?
Yes, that is one reason, another is that I have them, the 3. is more irrational.
I want to see if I can do it.
The drivers will also have to fit into pipes/extension sleves of 9 and 12 mm diameter.

Those effect resistors in your picture are designed to operate at too hot to touch. I have seen them used as heating elements in small switchboards.
Adding the two larger resistors have changed your resistance from 6 Ohm to 4,88 Ohm. That is borderline voltagedrop for running the LM317īs, have you tried just one 3 Ohm resistor?
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Old 08-25-2010, 01:42 AM #68
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

I have been trying different configurations, and I'm at the maximum voltage, that I want to drive my lm317's to keep them cooler. The ~1350mw power on the 445 is where I prefer to stay, so I probably wouldn't go with just one 3 ohm dropping resistor. Yes, both of the 3 ohm resistors will get heat sinks, because they get hot after about 5 minutes.
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Old 08-26-2010, 07:22 PM #69
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!


I am doing a quick and dirty driver for testing and have found a solution for the 12V wall-wart to red diode problem.
This LM317 can easily pull 500mA without heating up.
(Heatsink is from a broken UPS)

ETA: A MOSFET can apparently not be used as the transistor in a joule-thief. Will have to go shopping tomorrow.

ETA: I am up to 3V on the joule thief, will get cobber wire and ferrite beads sometime next week.
That will likely improve matters.
(A capacitor across the output after the diode really helps.)
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Old 10-09-2010, 05:21 PM #70
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

What about this:
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http://laserpointerforums.com/f42/er...ers-41820.html
http://laserpointerforums.com/f65/sw...des-53468.html

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By DX:
DealExtreme: Search for AMC7135 (6 products in 1 categories) AMC7135
DealExtreme: $1.99 18V 5W Cree Circuit Board for Flashlights (16.8mm*5.5mm)
DealExtreme: $2.39 MR16 1*3W 650~700mA Constant Current Regulated LED Driver (8~40V Input)

There are more
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Old 10-09-2010, 08:55 PM #71
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

I dont think the joule thief circuit will provide a usable amount of power, and if it does, it will vary greatly with battery condition (internal resistance). Perhaps you could power a 5 mW red from it, but not something that consumes in the order of half watt or more.
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Old 10-09-2010, 10:22 PM #72
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

Quote:
Originally Posted by Benm View Post
I dont think the joule thief circuit will provide a usable amount of power, and if it does, it will vary greatly with battery condition (internal resistance). Perhaps you could power a 5 mW red from it, but not something that consumes in the order of half watt or more.
I have more or less come to the same conclusion. It just looked so promising.
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Old 10-10-2010, 12:01 AM #73
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Default Re: Driver Compilation Thread - All Drivers In Just One Thread!

Original deleted.

I was missing the single cell feature.....duh.
What if the toroid was wound 2:1 doubling its "ringback"?
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