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Old 04-22-2011, 09:13 PM #17
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Default Re: help building lm317t driver

Avoid AAs, go with lithium ion rechargeable. AA alkalines just aren't very predictable in my experience.

It's hard to go wrong with 2x any normal sized li-ion cell.


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Old 04-22-2011, 09:19 PM #18
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Default Re: help building lm317t driver

Quote:
Originally Posted by rhd View Post
Avoid AAs, go with lithium ion rechargeable. AA alkalines just aren't very predictable in my experience.

It's hard to go wrong with 2x any normal sized li-ion cell.
to be honest i would love to but i have just spent 30+ just getting a new soldering iron and other tools i have no money for a while so i just wish to test it out using AA when i have it all running and as soon as i get paid i will be glad to use the recommended battery's
so just for now would they work ?
(sorry if i sound like a twat)
thanks
shaun

update*
would this happen to be the right type of battery?
http://cgi.ebay.co.uk/18650-Lithium-...#ht_3838wt_820

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Old 04-22-2011, 09:26 PM #19
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Default Re: help building lm317t driver

looks fine to me - don't know the quality of those cells, but they're the right kind
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Old 04-22-2011, 09:45 PM #20
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Default Re: help building lm317t driver

would thoes do (im about to order stuff from dx so might put them in the order)
$4.22 - TrustFire 14500 3.7V 900mAh Rechargeable Lithium Batteries (2-Pack) - Batteries

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doesn't matter as it happens i have some laying around

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Old 04-27-2011, 12:08 AM #21
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Default Re: help building lm317t driver

does anyone know how much power output i would get from 300mA of current to the A-140 diode with a ts317 voltage regulator with 2x cr123a batteries 3v each.. it doesnt seem to burn anything.
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Old 04-27-2011, 12:28 AM #22
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Default Re: help building lm317t driver

Potentially none.

I don't know the nominal voltage of 3V CR123s, but it might be around 3.4V ? 3.5V?

Either way, that's just 6.8 to 7V total, and if the LM317 drops 3V, then you've just got 3.8 to 4V for the diode, which might be below the lasing threshold.
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Old 04-27-2011, 12:55 AM #23
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Default Re: help building lm317t driver

yeah ur right. i just added a 1.5v AA to the 2x cr123a's and viola, it brighter and burns stuff and this is at 300mA's now i must make 1A
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