Just ordered 3 samples...
I'll post when I get them.
Just ordered 3 samples...
I'll post when I get them.
OK, I got the thing tested with a flexdrive and battery. My question now is:
I have two "D" cell batteries that put out 3v and jump around with the current from about 3.5W to a max of 5W. Would it be safe to connect Mr Phat to this hookup, WITHOUT a driver, seeing how it can stand much more current than these D's are putting out?
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....And, I may have found a host!!!! It's big and it's heavy!
thanx
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Peace, the Blob
Remember!If it works, fiddle
with it till it don't!
I wouldn't try that. Those D cells might be able to put out a BIG surge before they pull down.
HMike
Anything I can put between the D's and the lamp to avoid any surges? A capacitor maybe?
----------------------------------------
Peace, the Blob
Remember!If it works, fiddle
with it till it don't!
If happen to have a Farad or two at your disposal, it might work.
Do you mean 3.5A-5A? Instead of Watts?
Remember that diodes have ~next to zero ohms resistance when forward biased.
It would be like short circuiting the batteries. Shorting cells has never been considered a safe practice.
Get yourself a current limiting resistor network in there, and do some research on the maximum safe discharge current for the cell you're working with.
You may have to settle for a lower current, get different cells, or you might just have to 'settle' for a driver.
If you want that LED to last, you'll put a resistor in series with the circuit at the very least!
See the LaserBee II and all other LaserBee LPM products here....
All LaserBee Laser Power Meter Products
New 3.2Watt RS232/USB LaserBee II LPM REVIEW
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Great find! That is a neat little module.
I have a RGB set of these and the dev kit drivers. Remember that the slug is at + voltage so if you remove it from the tec you need to isolate it from the heat-sink. They get hot, so they need to be well cooled.
As for powering them, At these currents you really need a switching adjustable current supply. At 10 amps you are going to need a HUGE, HOT, resistor. wasteful and just not a good idea. Unless you just go direct and count on the ESR of the cells to insure they don't destroy themselves ( also a bad idea ).
These are the drivers that come with the luminus dev kit, well some of them.
http://www.national.com/an/AN/AN-1793.pdf
They work well and can be pwm dimmed and or modulated efficiently.
Hemlock Mike's module would be a great place to start.
chad
When the going gets weird, the weird turn pro.
You have basically answered your own question...
A Current regulated supply usually allows you to adjust the regulated
current and is an electronic circuit with multiple components.
A current limiting supply is usually preset to a certain current level and
can be as simple as a single resistor.
Jerry
See the LaserBee II and all other LaserBee LPM products here....
All LaserBee Laser Power Meter Products
New 3.2Watt RS232/USB LaserBee II LPM REVIEW
Always in stock and ready to ship....
Subsidary:-Pharma Electronic Solutions
@ MB, yeah, I meant Amps, not Watts.
@ LB, Cool! Got your Laserbee LPM last night! Set it up and it worked great on all my pointers.
.........Amazing what one can learn just listening to you guys jibber jabber electronically.
----------------------------------------
Peace, the Blob
Remember!If it works, fiddle
with it till it don't!