Old 02-03-2015, 04:15 AM #1
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Default Lo-D Drivers

Hey guys. I got some new fancy linear drivers for sale for you all to try out.


Because they ARE linear drivers, they do require a good deal of heatsinking when your output voltage differs heavily from the input. The closer the two are, the better (within 1 V is the best).


I currently have 4 in stock. They are adjustable from 330 mA to 3.3 amps. These are the newest design, with a blank PCB pad on the back for superior heatsinkability. This pad is connected to ground.

These drivers are fully tested across every different load range, from extremely low to extremely high. They sport thermal protection to protect the driver from overheating, which makes the output current drop until it reaches a certain equilibrium.


The dropout voltages on these boards ranges from 700 mV to 1 volt, depending on what kind of output voltage you're using. Output ripple is nonexistent. As said, they DO need good heatsinking. I have done testing on output spikes (using my test load, an LPC diode (and an oscilloscope) and the soft start is very noticeable on the o-scope.




They are $14 each, with $2 shipping in the CONUS.

If you need a lower/different current range feel free to send me a PM and I'll change a board to match what you need to the best of my ability.


Pictures;









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Old 02-03-2015, 10:28 AM #2
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Default Re: Lo-D Drivers

Re-sized & re-hosted your 219 Gigapixel image for you

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Old 02-05-2015, 01:56 AM #3
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Default Re: Lo-D Drivers

OP has been updated with more information and stuff.
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Old 02-06-2015, 07:52 PM #4
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Default Re: Lo-D Drivers

PM me, I'll paypal you to buy all six.
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-06-2015, 09:49 PM #5
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Default Re: Lo-D Drivers

Pending sale.
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Old 02-07-2015, 01:43 AM #6
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Default Re: Lo-D Drivers

I might have made the wrong assumption, are these adjustable constant current regulators or voltage?
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-07-2015, 02:06 AM #7
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Default Re: Lo-D Drivers

No, they're constant current regulators. I wouldn't be selling them as laser diode drivers otherwise!
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Old 02-07-2015, 02:42 AM #8
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Default Re: Lo-D Drivers

Too bad they are all gone- if you make a few more, send me a PM
Also, did you reflow those, or just hand solder them? A few pics make it looks like there is some missing solder and shorts. Just curious- not a hard problem to fix with an IC that big anyway
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Old 02-07-2015, 03:01 AM #9
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Default Re: Lo-D Drivers

OK, thanks. What is the lowest input voltage you observed they can be supplied to output 2.0 VDC at roughly 4 amps each?
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-07-2015, 03:25 AM #10
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Default Re: Lo-D Drivers

To supply that current at that voltage shouldn't be too problematic, a fully charged li-ion should do the trick just fine.


crazy- I did actually reflow these, but because they were the first iteration of these drivers they are a little messier than usual. The reason some look like they're missing caps/whatever is because I was doing some testing when I was taking those pics. The finished final boards have the proper stuff in all the places, no worries. And no shorts, I tested every board by hand.

I actually found another regulator in the same class as the one I'm using, and they advertise it as an incredibly low 400 mV dropout at 5 amps, but the regulator is about $3.5 more expensive, and as such the driver's price would have to increase too if I used those instead.

But dang, that low dropout is ***y.

And I will be making more, it just might be a week or two before I can.
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Old 02-09-2015, 02:05 AM #11
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Default Re: Lo-D Drivers

OP re-updated. I have one in stock currently, adjustable from 200 mA to max.
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Old 02-12-2015, 04:59 PM #12
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Default Re: Lo-D Drivers

I think this looks like exactly what I need.

Application:
Power a circuit of 12 infrared LEDs for Raspberry Pi infrared camera tinkering.

LED spec: 1.5V @ 100mA

I think I can do 3 strings of 4 LEDs each in parallel. Each series string of 4 would drop ~ 6Vdc, the 3 series strings would sum up to ~300mA.

Power = 4AA batteries.

Does that sound like your Lo-D driver would do the trick?

Thanks!
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Old 02-12-2015, 06:09 PM #13
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Default Re: Lo-D Drivers

Sent you a PM.
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Old 02-13-2015, 02:13 AM #14
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Default Re: Lo-D Drivers

Quote:
Originally Posted by Kris View Post
L
Laser diode drivers make excellent LED
drivers. They are usually more expensive
and a bit of overkill, though. LEDs can
handle crazy current spikes. Heat is the
real enemy of an LED. I have no doubt that
the Lo-D would work VERY well in your
application.
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Old 03-16-2015, 10:58 PM #15
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Default Re: Lo-D Drivers

OP updated. 4 in stock with more potentially available depending on demand.
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Old 03-25-2015, 01:05 AM #16
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Default Re: Lo-D Drivers

Bump, 4 still in stock. 330 mA to 3.3 amps adjustable.
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