Old 02-05-2009, 03:08 AM #1
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Default Rechargable Red OC Build w/HiPower Lens

This is a photo of my new Red Open-Can Build:

LPC-815 diode running @ 350 ma. w/brass heatsink
#18650 Lithium-ion battery (2600mah)
Brass housing coated lens assembly (pretty good collimation)
Grey hard-anodized host; gold-plated tailcap spring
Still testing a few more lenses.

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Old 02-05-2009, 03:14 AM #2
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Default Re: Rechargable Red Build

Nice build and nice size heatsink for OpenCan. 8-)

Are you using the AMC7135 driver for this. :P
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Old 02-05-2009, 03:24 AM #3
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Default Re: Rechargable Red Build

No driver at all.

Just using a power resistor to drop the voltage to a set current of 350 ma (~3V).

Several hours of run time with the 2400 mah battery, before any significant voltage drop.

The AMC chip would work just fine.

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Old 02-06-2009, 12:33 AM #4
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Default Re: Rechargable Red Build

Except the module has to be electrically isolated if using the 7135... :P
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Old 02-06-2009, 04:30 AM #5
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Default Re: Rechargable Red Build

What value is the resistor for that much current? (ohms/wattage)
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Old 02-06-2009, 07:30 AM #6
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Default Re: Rechargable Red Build

Quote:
Originally Posted by Nameless_Ranger
What value is the resistor for that much current? (ohms/wattage)
I used 3.9 ohms @ 1/2 watt.

It's only dropping ~ 1.2 volts

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Old 12-18-2009, 06:34 PM #7
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Default Re: Rechargable Red OC Build

is the laser dead because there is no driver ? or still alive ?
and can you tell me which host it this ?
thanks
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Old 12-19-2009, 05:34 AM #8
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Default Re: Rechargable Red OC Build

The OC Red is still working very well (11 months w/~ an hour per month).

The resistor is more reliable than any electronic driver.

It now has a newer lens AR-coated for Red LD's.

Here's a photo with reflection from the rain at the recent Candlepower Forum meeting in Arlington:

I picked the host because it was hard-anodized ...
and uses a #18650 li-ion battery:

Host Link

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