DC to DC Multi-Purpose Voltage Converter $14.98

[Lyen]

This is for a nifty and versatile device I have been testing for the last few months. It is very easy to use, all you have to do is twist the knob on the bottom to your preferred output voltage. The DC-DC step down voltage converter has many uses mention below:


When I am on the road, I personally use it on my electric bike to provide power the the LED flashlight and blinker from my 48v LifePO4 battery. I was able to power the 900 lumen Cree LED safely without the LED driver circuit board since the current output is identical. This way, I do not have to go through a series of flash modes from my flashlight.


I sometimes use it to charge both Lipo and LifePO4 as a single cell battery and multiple battery cells in an emergency situation. In fact, I had to use it quite a few times to balance individual cells on my battery packs.


I also use it to recharge my PDA phone by plug in via the 5v from USB port. I sometimes use the GPS function on the phone while riding on the road and have my phone draws power from the ebike battery this way.


At home, I used it to down convert my laptop computer power supply to accompany with my RC charger in order to recharge my Lipo batteries. I am also able to power devices from my solar panels at home by simply adjust the DC-DC converter to the desire voltage.


Specification:
Model: QSKJ QS-4805CBD-3A
Voltage input range: 4.5V to 55V
Voltage output range: 1.2V to 30V
Current: 3A
Size: a little smaller than a matchbox at 50mm x 25mm x 13mm
Weight: about the same weight of a AA battery

I have only 70 available as of September 20th, 2012.

$14.98 + $2 shipping for US & Canada. Click here to purchase.

$14.98 + $3 shipping for international buyers (if you are outside US & Canada). Click here to purchase.

Please contact me via private message or email me at LYEN@HOTMAIL.COM if you would like to purchase other accessories. I will then calculate the total and send you an invoice to purchase.

I have more available on hand and ready to ship as of 2/20/2013.

Quantity updated as of 9/27/2012 @ 8:15 PM PST: 69 left (buyer bought 1 from Bradford, West Yorkshire, United Kingdom )
Quantity updated as of 9/28/2012 @ 1:14 AM PST: 68 left (buyer bought 1 from anchorage, AK)
Quantity updated as of 10/7/2012 @ 3:31 AM PST: 66 left (buyer bought 2 from Singapore )
Quantity updated as of 10/10/2012 @ 12:36 AM PST: 65 left (buyer bought 1 from Köln, Germany )
Quantity updated as of 10/14/2012 @ 9:21 PM PST: 64 left (buyer bought 1 from Henderson, NV )
Quantity updated as of 10/26/2012 @ 6:59 PM PST: 63 left (buyer bought 1 from DeRidder, LA )
Quantity updated as of 10/27/2012 @ 11:36 AM PST: 62 left (buyer bought 1 from Hamburg, Germany )
Quantity updated as of 11/3/2012 @ 5:15 PM PST: 61 left (buyer bought 1 from Sterling, VA )
Quantity updated as of 11/8/2012 @ 11:14 AM PST: 60 left (buyer bought 1 fromSydney, New South Wales, Australia )
Quantity updated as of 11/11/2012 @ 9:31 AM PST: 58 left (buyer bought 2 from Seattle, WA )
Quantity updated as of 11/22/2012 @ 2:40 AM PST: 57 left (buyer bought 1 from Helsinki, Finland )
Quantity updated as of 11/24/2012 @ 12:02 PM PST: 56 left (buyer bought 1 from Wilhelmshaven, Germany )
Quantity updated as of 11/28/2012 @ 12:36 AM PST: 52 left (buyer bought 4 from Ekaterinburg, Sverdlovsk Oblast, Russia )
Quantity updated as of 12/05/2012 @ 9:21 PM PST: 50 left (buyer bought 2 from Portland, OR )
Quantity updated as of 12/11/2012 @ 6:19 PM PST: 48 left (buyer bought 2 from Footscray, Victoria, Australia )
Quantity updated as of 12/12/2012 @ 10:36 AM PST: 47 left (buyer bought 1 fromSurrey British, Columbia, Canada)
Quantity updated as of 12/17/2012 @ 3:15 PM PST: 46 left (buyer bought 1 from Port Stanley, Ontario, Canada )
Quantity updated as of 12/26/2012 @ 11:14 AM PST: 45 left (buyer bought 1 from  Kuurne, Belgium)
Quantity updated as of 12/27/2012 @ 5:31 AM PST: 43 left (buyer bought 2 from Alton, Hampshire, United Kingdom )
Quantity updated as of 12/29/2012 @ 6:19 PM PST: 42 left (buyer bought 1 from Bell Gardens, CA)
Quantity updated as of 1/3/2013 @ 7:21 PM PST: 41 left (buyer bought 3 from Waldenbuch, Germany )
Quantity updated as of 1/7/2013 @ 2:36 AM PST: 39 left (buyer bought 2 from Allston, MA)
Quantity updated as of 1/12/2013 @ 9:05 PM PST: 38 left (buyer bought 1 from Patras, Acaia, Greece )
Quantity updated as of 1/16/2013 @ 11:14 AM PST: 37 left (buyer bought 1 from  London, United Kingdom )
Quantity updated as of 1/17/2013 @ 9:31 AM PST: 36 left (buyer bought 1 from Cambridge, Cambridgeshire, United Kingdom )
Quantity updated as of 1/22/2013 @ 9:14 AM PST: 35 left (buyer bought 1 from Höhr-Grenzhausen, Germany )
Quantity updated as of 1/23/2013 @ 12:31 AM PST: 34 left (buyer bought 1 from San Francisco, CA )
Quantity updated as of 1/31/2013 @ 3:19 PM PST: 31 left (buyer bought 3 from Helsinki, Finland )
Quantity updated as of 2/5/2013 @ 9:05 PM PST: 30 left (buyer bought 1 from Commerce, CA)
Quantity updated as of 2/7/2013 @ 11:14 AM PST: 29 left (buyer bought 1 from  Zwingenberg, Germany )
Quantity updated as of 2/7/2013 @ 9:31 AM PST: 27 left (buyer bought 2 from Rochester, NY )
Quantity updated as of 2/11/2013 @ 9:14 AM PST: 26 left (buyer bought 1 from Dornbirn, Austria )
Quantity updated as of 2/19/2013 @ 12:31 AM PST: 25 left (buyer bought 1 from Santeramo in colle, Bari, Italy )
Quantity updated as of 2/20/2013 @ 3:19 PM PST: 23 left (buyer bought 2 from Quebec, Canada )
Quantity updated as of 2/26/2013 @ 3:19 PM PST: 21 left (buyer bought 2 from SANT CUGAT DEL VALLÈS, Barcelona, Spain )
Quantity updated as of 2/26/2013 @ 12:31 AM PST: 20 left (buyer bought 1 from Mesquite, NV )
Quantity updated as of 2/27/2013 @ 9:14 AM PST: 19 left (buyer bought 1 from Fresno, CA )
Quantity updated as of 2/28/2013 @ 3:19 PM PST: 18 left (buyer bought 1 from Bettystown, co. Meath, Ireland )
Quantity updated as of 3/10/2013 @ 12:31 AM PST: 17 left (buyer bought 1 from San Diego, CA )
Quantity updated as of 3/20/2013 @ 3:19 PM PST: 16 left (buyer bought 1 from  Quorn, Leicestershire, United Kingdom )
Quantity updated as of 3/23/2013 @ 12:31 AM PST: 15 left (buyer bought 1 from NOVOSIBIRSK, RU, Russia )
Quantity updated as of 3/24/2013 @ 3:19 PM PST: 14 left (buyer bought 1 from St. Gallen, Switzerland )
Quantity updated as of 3/25/2013 @ 3:19 PM PST: 13 left (buyer bought 1 from Fehraltorf, Switzerland )
Quantity updated as of 3/27/2013 @ 12:31 AM PST: 11 left (buyer bought 2 from Doral, FL)
Quantity updated as of 4/5/2013 @ 9:14 AM PST: 10 left (buyer bought 1 from Oslo, Norway )
Quantity updated as of 4/9/2013 @ 3:19 PM PST: 8 left (buyer bought 2 from Warrandyte, Victoria, Australia )
Quantity updated as of 4/12/2013 @ 12:31 AM PST: 6 left (buyer bought 2 from Jannali, New South Wales, Australia)
Quantity updated as of 4/14/2013 @ 3:19 PM PST: 5 left (buyer bought 1 from  Großbodungen, Germany )

Here're more accessories:
$15 throttle (full/half/thumb) with mated left rubber grip (very good quality) (ebikekit retails @ $36)
$19 cruise control (manually installation required)
$15 three way speed switch (manually installation required)
$15 PAS - Pedal Assist System add-on (manually installation required)
$15 electric brake levers a pair

[yopappamon]

I bought one.

[chroot]

I'll need one whenever i get paycheck from work and hope you will have plenty left over later on.

[NorCalTuna]

ed, awesome box!

will we see a 100v version any time soon? how about adjustable current?

[tostino]

ed, awesome box!

will we see a 100v version any time soon? how about adjustable current?

Scratch that, need a 150v version actually .

[Amonk]

I plan on using this to power my Magicshine light from the battery on the bike(36v lifepo4).I'll let you know how it works.

[Russell]

I sent payment for 1 at 1:51PM PST

-R

[The Mighty Volt]

I will take two!!

God Damn Ed I will have no money left!!

Stop advertising!!!

[SunCoaster]

Payment sent for one converter @ 4:19pm PST.

Tom

[Lyen]

ed, awesome box!

will we see a 100v version any time soon? how about adjustable current?

Hi NorCalTuna,

I think you can do that by simply attach a high voltage brush controller instead.

[Lyen]

They are all sold out as of September 18th, 2010 at 10:13PM. Please PM me or send me an email at LYEN@HOTMAIL.COM for request if you are interested. I will consider getting some more. Thanks!

Regards,
Lyen

[ecodean]

Got mine today, Thank You for the quick service.

[Lyen]

I have more DC to DC multi-purpose voltage converters available on hand and ready to ship as of 9/28/2010.

[docnjoj]

Thanks Lyen!
otherDoc

[evrunna]

I got mine on Monday shipped to Australia fairly quick delivery.. Thanks Lyen

Vince

[docnjoj]

I just received my two and immediately put them to the test. They are way cool. I will be using one to determine the brightness of an led light vs voltage. I know some have a built in regulator but I don't think the old Cateye does. Then if it blows I can justify a Magicshine and use these to power it. The pot adjuster is very fine so you can be really accurate with the voltage setting. Thanks again Lyen.
otherDoc

[LI-ghtcycle]

Wow, very tempting, I might be buying one of these soon, too bad you don't have a larger version with a heat-sink and multiple out-puts.

[docnjoj]

I found out that the light is much brighter at 6V than at 3 volts so it's regulator must have some headroom. I gotta get more of those D/C to D/C things as I now only have one left. The first is permanently mounted to my wife's bike as the power source for her lights. Great little gadgets! Actually I could now change it out for a less versatile 6 volt charger from a wall wort! Hmmmmm. These are great test tools!
otherDoc

[neptronix]

Oh hell yeah. Just ordered 2 of these. They will power 2x 450 lumen flood lights off my battery pack.

I hope you restock at some point

[StudEbiker]

I got mine last week. I would be interested in seeing pictures of how you ran connections from the posts and how you have installed them on bikes. Did you put it in a project box, or what?? Lots of possibilities. It would be nice if the pins didn't go straight out from the back, say if they were bent @ 90 deg. angles to the side. I am tempted to try and bend them, but I don't want to frak up the converter.

[jamo96]

Haha small world. Someone else bought this from Toowoomba, Australia. Received mine today.

[thewmatusmoloki]

Thanks Lyen.

As usual, no fuss, well packaged, fast delivery.

Outstanding.

Matt.

[The Mighty Volt]

Lyen is the man. I just got a spare USB programme cable, well wrapped, fast delivery, thanks.

[GTR2EBIKE]

Just sent payment

[GCinDC]

lyen, what LED light are you using? got a link?