Author Topic: Voltage question?  (Read 23577 times)

Offline Leslie

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Re: Voltage question?
« Reply #15 on: September 07, 2010, 11:36:31 AM »
http://cgi.ebay.com.au/DC-to-DC-Converter-48V-2A-Single-out-3-3V-10A-/370119388078?pt=LH_DefaultDomain_0&hash=item562cd5abae

I bought two of these and got some Cree clones with 15o some lenses.  At 15o 3.3v it should bright enough and not get too hot.

One of these converters could run enough cree lamps to blind you like the sun.



OMG two inches across..

Thanks Monkey Ive been looking for a high powered 60v to 3.3v DC to DC converter to 3.3v for yonks.
« Last Edit: September 07, 2010, 11:40:05 AM by 317537 »

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Offline MonkeyMagic

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Re: Voltage question?
« Reply #16 on: September 07, 2010, 12:08:47 PM »
hey no probs ;)

I'm using one of these for my headlight:
http://cgi.ebay.com/12V-27W-LED-Running-Spot-light-Landcruiser-Hummer-Jeep-/180556759183?pt=AU_Motorcycle_Parts_Accessories&hash=item2a0a05808f

It is ridiculously bright I think Mark has the same light?

Definitely well worth the price, with hardened brackets and handlebar mounts included, plus I don't think it would ever get hot riding at night with the wind blowing on it

Offline Leslie

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Re: Voltage question?
« Reply #17 on: September 07, 2010, 05:54:17 PM »
They are awesome. 2 amps isnt too bad either..

My humble light is coming along .Maybe 3.3 v isnt enough as I can only get 600 ma at 3.15 from four lights and the on resistance is only 5.25 ohms.

So I will be lucky to push 630ma amps at 3.3v 2 watts :(

Its bright enough to ride.  Im using a small puffy LI cell maybe the DC converter will do better.  Im hoping the output of the DC converter maybe a point or two higher than stated on the sellers page.



The actual led I got are rated at 3.4v maybe I go for a couple of 5 watters and run those converters in series correct polarity at both primary and secondary IO.  I think my converters are not isolated so I will need to take care of the polarity.

I think I will be happy just the same.


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Offline Sundsvall

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Re: Voltage question?
« Reply #18 on: September 07, 2010, 08:49:45 PM »
hey no probs ;)

I'm using one of these for my headlight:
http://cgi.ebay.com/12V-27W-LED-Running-Spot-light-Landcruiser-Hummer-Jeep-/180556759183?pt=AU_Motorcycle_Parts_Accessories&hash=item2a0a05808f

It is ridiculously bright I think Mark has the same light?

Definitely well worth the price, with hardened brackets and handlebar mounts included, plus I don't think it would ever get hot riding at night with the wind blowing on it

Looks really great but I’ve already ordered the lights from DE. :(
So now I have to believe they are better. ;)

Peter
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C

Offline Leslie

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Re: Voltage question?
« Reply #19 on: September 07, 2010, 11:47:37 PM »
Yes Peter maybe be sit back before we spend any more cash and let Monkey do our web search for us.  He seems to find the nooks and crannies online.

I maybe did my last Ebay search on DC to ?DC converter years ago before I gave up.  It certainly is great to have fresh blood here help out.

No your light is better than mine and their lights are better than ours. It's just something we have to live with.  *shakes fist* lol.


As long as we can see where the hell we are going 10 seconds before we run into it we will be fine.

The only thing I can say about my humbled light is the whole thing only set me back $40 and I get two DC conveters for two bikes, and my Led lamps should out live all of yours as they are running lower than rated.

But that said I would like the ease and power the pre made lamps offer.


Edit.

Ohh I retested my lamp on a better cell and I gots 800 ma.  2.56 watts.  Yip pee.  ::)
« Last Edit: September 08, 2010, 12:10:14 AM by 317537 »

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Offline Leslie

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Re: Voltage question?
« Reply #20 on: September 08, 2010, 12:42:59 AM »
Ahhhh damn.

Did I say mine would live lionger.  NOT!

The problem with playing with these things is you go blind trying stuff I even feel like my face is sun burnt..  I broke it. LMAO.


So now I order 3 of these

http://www.dealextreme.com/details.dx/sku.4516

I run my inverters in series and get me 15 watts.  I will have 3.3 v taps for some red stars.

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Offline Leslie

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Re: Voltage question?
« Reply #21 on: September 08, 2010, 01:07:05 AM »
And Peter the DC DC converter I am buying seems to be adjsutable too Im sure not all  are.  I read it on the datasheet

http://chipcatalog.com/CDT/VKA50MS03.htm

They have a trim and you can make the volts more or less.

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Offline Leslie

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Re: Voltage question?
« Reply #22 on: September 08, 2010, 01:11:08 AM »
Edit:

Ahh but you want 28v DC to 4v~8v.  

I found this.

http://cgi.ebay.com/VKA100LS02F-DC-DC-Converter-24V-2V-30-3A-100W-/220651464583?pt=LH_DefaultDomain_0&hash=item335fda2787

18 to 36V @ 8A Input Range 2v 30.3 amps out, its adjustable by putting a resistor to V+ to trim.

Yes it has the trim option like mine so you can use this one for both your lights.  It cant be adjusted lower than 2v.

Ive uploaded it data sheet.

Enjoy.
« Last Edit: September 08, 2010, 06:10:28 AM by 317537 »

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Offline Sundsvall

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Re: Voltage question?
« Reply #23 on: September 08, 2010, 03:34:23 PM »
Ahhhh damn.

Did I say mine would live lionger.  NOT!

The problem with playing with these things is you go blind trying stuff I even feel like my face is sun burnt..  I broke it. LMAO.


So now I order 3 of these

http://www.dealextreme.com/details.dx/sku.4516

I run my inverters in series and get me 15 watts.  I will have 3.3 v taps for some red stars.

If you haven’t broke it, you couldn’t motivate to buy those 5 W. ;) I think you’re going to get a great amount of light with those.
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C

Offline Sundsvall

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Re: Voltage question?
« Reply #24 on: September 08, 2010, 03:38:57 PM »
Edit:

Ahh but you want 28v DC to 4v~8v.  

I found this.

http://cgi.ebay.com/VKA100LS02F-DC-DC-Converter-24V-2V-30-3A-100W-/220651464583?pt=LH_DefaultDomain_0&hash=item335fda2787

18 to 36V @ 8A Input Range 2v 30.3 amps out, its adjustable by putting a resistor to V+ to trim.

Yes it has the trim option like mine so you can use this one for both your lights.  It cant be adjusted lower than 2v.

Ive uploaded it data sheet.

Enjoy.

Thanks!

Can’t take a look at these now since I’m travelling with my work computer and ebay is on the blocking list.

Peter
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C

Offline Sundsvall

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Re: DC-DC converter
« Reply #25 on: September 08, 2010, 03:47:09 PM »

Hi Peter,

I found this 3 Amp DC-DC converter on ebay:


Click on image for more details.

Those lights are rated at 1 Amp each, so this converter should be able to run both lights.

Alan
 

I’ve now asked a friend to buy this converter, I hope he can fulfil the order.

Peter
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C

Offline Leslie

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Re: Voltage question?
« Reply #26 on: September 08, 2010, 03:54:15 PM »



VKA100LS02F Single Output Half Brick DC/DC Converter 100W 24V to 2V @ 30.3A

Description: The VKA100xS Series DC/DC converters present an economical and practical solution for distributed power system architectures which require high power density and efficiency while maintaining system modularity and upgradeability. With the ability to operate over an input voltage range of 18 to 36 volts, these modules are ideal for use in battery backup applications common in today's telecommunication and electronic data processing applications. The output is fully isolated from the input, allowing for a variety of polarity and grounding configurations. The VKA100xS's proprietary control circuitry responds to 50- 100% load steps in 100?Seconds to within 1% nominal Vout. The patented fixed frequency architecture combined with surface mount technology results in a compact, efficient and reliable solution to DC/DC conversion requirements.

    * Very Nice, High Quality DC-to-DC Converter
    * Manufacturer: C&D Technologies, Inc.
    * 100W
    * 18 to 36V @ 8A Input Range
    * Single Output
    * 2.0V @ 30.3A
    * Pricing is for a single unit. These are from their original packaging and are unused.
    * These are in excellent condition.


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Offline Leslie

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Re: Voltage question?
« Reply #27 on: September 08, 2010, 03:56:24 PM »
Maximum Current:  3 A ( 30W ,Under normal circumstances please 2A Current)

Hnmmm by the skin on your nose maybe. You should be fine.
« Last Edit: September 08, 2010, 03:58:31 PM by 317537 »

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Offline Sundsvall

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Re: Voltage question?
« Reply #28 on: September 08, 2010, 04:21:04 PM »



VKA100LS02F Single Output Half Brick DC/DC Converter 100W 24V to 2V @ 30.3A

Description: The VKA100xS Series DC/DC converters present an economical and practical solution for distributed power system architectures which require high power density and efficiency while maintaining system modularity and upgradeability. With the ability to operate over an input voltage range of 18 to 36 volts, these modules are ideal for use in battery backup applications common in today's telecommunication and electronic data processing applications. The output is fully isolated from the input, allowing for a variety of polarity and grounding configurations. The VKA100xS's proprietary control circuitry responds to 50- 100% load steps in 100?Seconds to within 1% nominal Vout. The patented fixed frequency architecture combined with surface mount technology results in a compact, efficient and reliable solution to DC/DC conversion requirements.

    * Very Nice, High Quality DC-to-DC Converter
    * Manufacturer: C&D Technologies, Inc.
    * 100W
    * 18 to 36V @ 8A Input Range
    * Single Output
    * 2.0V @ 30.3A
    * Pricing is for a single unit. These are from their original packaging and are unused.
    * These are in excellent condition.



What’s the dimension on this?

I haven’t any place left.

Peter
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C

Offline Sundsvall

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Re: Voltage question?
« Reply #29 on: September 08, 2010, 05:42:15 PM »

What’s the dimension on this?

I haven’t any place left.

Peter


Sorry, found it in the pdf. :-[

Peter
Midsummer sun = up 02:54   down 22:51   angle 51,0° :)
Midwinter sun =    up 09:19   down14:18   angle 4,2° :(
Mean annual temperature = 3,1°C