Original Power Supply Fails Every Two Months
OQO model 01+ is really an amazing UMPC ever built among other competitors in the world. It comes with Windows XP Professional or Tablet PC Edition and under both version of Windows the stylus pen works just fine with the 5 inches LCD touch screen. Inside 30 GB of 1.8 inch hard drive, I could install both Linux and Windows using dual boot mode. While I am writing this article, the latest OQO model e2 is even more amazing than this. It has much nicer keyboard appearance with back light that glows in the dark.
I bought my OQO on November 2007 and it has one year warranty for service and part replacement. THREE TIMES of power supply failure had happened ever since within 6 months. At the beginning, I thought it was my mistake which made the power supply got broken. Anyway, I have the warranty, so I sent the power supply back to the reseller and they replaced it with a brand new one. Up to today, I got it replaced twice from them, and strangely, again, it got broken for the third time last week. I could send it back as many times as I want to the reseller since I am still holding the warranty. But what would happen to my OQO after the warranty is over? I will have no option by that time except to buy the original power supply for over 150 euro EVERY TWO MONTHS just to make my OQO works. Wow, that would be a really pain in the ass!
I wrote an email to the OQO's customer service, asking for solution except repeatably get the same replacement from them or their reseller. However, they said that this OQO model 01+ is now a discontinued product. Moreover, when I asked about the power supply electrical connection of their discontinued product, it seems that it is still a "continued proprietary" of OQO and they are not willing to share it with me even though I wanted to use it for my research project.
Hack it! Hack it, Eka! That sentence has been there in my mind and I think it is time for me to move my ass and get it works with my own hacked power supply because I still want to see my UMPC to work and not yet ready to give it up or upgrade to the latest model e2. TO ALL OF YOU OUT THERE, PLEASE DON'T CALL OQO FOR ANY SUPPORT FROM THEM AFTER YOU HACK YOUR UMPC AND DO REMEMBER THAT YOU DO THIS AT YOUR OWN RISK! I am here to provide you with information on how I got it works for my OQO model 01+. I believe that different model could have different configuration. You could send me comments or email if you have problem with your power supply or if you have a different model of OQO than mine. I don't guarantee that I could help you to solve your problem, but you have nothing to lose to try, right?
OQO without Battery and Power Supply
First unplug the power supply and remove the battery from OQO. If you don't know how to remove the battery, please read the manual. You will see a connector shown by figure on the right. What I did was measuring using Ohm meter to find out about what and where does it go between each of them. It turned out that A and B are connected, it didn't surprise me that both of them are connected to the body as well. So A and B obviously are the reference point (the ground).
Still on the OQO body, there is a male connector goes to the power supply. I measured this connector using ohm meter. It turned out that 2 and 4 are tied together, and also 3 and 5 are tied. Why would they put FIVE pins connector if at the end they tie the two of them into one? Wouldn't it be more convenient to put less pins for the power supply? Hey, OQO, listen up! What were you doing guys out there?
Resistance measurement was continued between connector at the back of OQO with the power supply male inlet. It seemed that A, B, 2, and 4 are connected together. This is very obvious and I could conclude that this is exactly where I would put the ground of my home made power supply. Then, pin number 1 on the inlet male connector is connected to D on the back of OQO.
So how to power up this OQO by my home made power supply? This is the possible configuration of the male connector, (1) is VCC1, (2) is GND, and (3) is VCC2. Pin (4) is connected to GND and pin (5) is connected to VCC2. So far I didn't know how much is VCC1 and VCC2, but I knew that it needs two different voltages to power it up because they are not tied together.
The Original Power Supply
Luckily, when I received my second replacement of power supply, I did measured the outputs from the female connector on the power supply. First I tried to measure it using Ohm meter to see any connected pin while it is turned off. Only point b and e that I found are connected together (this could be the ground). Then I plugged the power supply and proceeded to voltage measuring. Point a is 5 volts, point d is also 5 volts, instead point c is 6 volts. So, by far, we know that VCC1 = 6 volts and VCC2 = 5 volts! Great! Then, I moved on!
Windows' Power Management Behavior
I explored more on OQO behavior by putting a piece of paper to isolate each battery connector at a time and put the battery back to OQO. I plugged the power supply and here what I found when I turned it on.
Isolate C with a piece of paper Windows doesn't know the status of the battery, but OQO works with/without power supply attached.
Isolate D with a piece of paper Battery doesn't recharge anymore, but OQO works with/without power supply attached.
Isolate E with a piece of paper Battery is charging, battery status can be read, but OQO doesn't work without power suppy attached.
From this behavioral test, I could guess that C is the charging/full indicator from the battery to Windows, D is the charging port directly from 6 volts of power supply, and E is the main positive pole of the battery.
Hypotheses
1. Lithium Polymer battery nominal voltage is 3.7 volts. Thus the battery may recharge using 5 volts source instead of 6 volts.
2. We may simplify the power supply design by using single and uniform power source.
Experimental Test
The given specification of the power supply is 4.8 volts and 2.5 Amperes. I know it is not easy to find a switching power supply as needed so I did some experiments by powering up my OQO with a stable desktop power supply. As I described above, I powered OQO with VCC not to all of 5 pins but only 3 of them. I took 3 single sockets from jumper cables and soldered them as seen in the picture. The configuration is VCC - GND - VCC. To isolate each of them properly, I put a thermoplastic wire insulation a.k.a. heat-shrink tubing. The experiment went very well when I applied VCC between 4.5 volts to 5 volts. The drawback of using low voltage is a slow charging, but it saves more energy since the current withdrawn by OQO is less. I don't suggest you to apply 6 volts (I didn't try it too) since it works just fine with 5 volts. Make sure you measure your desktop power supply before you attach it to your OQO!
Conclusion
It is possible to replace OQO power supply with a single 5 volts switching power supply from the market (in my case, I use 4.5 volts instead). I use variable switching power supply Accord PDS115, but you may use any power supply as long as it could provide continuous electric current at least 2.5 Amperes. The output's characteristic of PDS115 power supply are 3, 4.5, 6, 7.5, 9, and 12 volts within a different range of current withdrawn. Complete specification of Accord PDS115 can be found here. The advantages of using a switching power supply are small in size and of course light weight. It is even smaller and lighter than the original OQO power supply.
Future Work
Since I still have my warranty until November 2008, I won't cut and take the connector out of the original power supply. If OQO doesn't even bother to fix the problem for OQO model 01+ power supply by the end of November 2008, then I will cut the connector and put it to Accord PDS115. For those of you who are not patient enough to wait ;), the picture shows you how to connect your power supply to the connector taken from OQO power supply. This way you will have a very secure connection compared to the home made one. I will update my blog as soon as I cut my connector guys!
I hope this article helps you out who experiences the same problem as I do and I open to any suggestion and comment.
57 comments:
Ciao sto verificando la possibilità di un adattatore a 12 volts (che mi arrivrà a giorni), da usare con il 220 a casa, per bypassare alle deficienze del powewr supply.
Ti farò sapere.
E'scandaloso che non abbiano ovviato all'inconveniente, nei forums dedicati è un lamento continuo.
Ciao
Grazie, sono riuscito a cambiarlo con 19 euro di switching supply normale. Ho comprato a Pisa :)
Ciao ti dicevo dell'adattore che carica la batteria,mi è arrivato, ma quando l'oqo è acceso probabilmente è troppo potente l'assorbimento, e vedo del fumo nell'adattatore, che è un matsuyama.
Cosa hai comprato, e soprattutto dove.
ciao Lorenzo.
Devi controlare la corrente, al minimo 2.5 Ampere. Ho comprato un'alimentatore Accord PDS115 e l'ho modificato per alimentare l'OQO direttamente come l'ho scritto nel mio blog. Si compra a Pisa con 19 euro sul' Elettronica Etruria: http://www.elettronicaetruria.it/catalog/index.php?cPath=46&sort=3a&filter_id=25. Ciao, e buona fortuna!
Si compra anche adattore GioStyle da 230V a 12 VDC a Carrefour oppure Decathlon e ti costa 24 euro.
http://www.decathlon.co.uk/EN/images/assets/gd-asset_1342164.jpg
Ciao sei un mito...
Volevo sempre provare ma non ho mai avuto il coraggio di farlo..
Solo una cosa....dove hai trovato i connettori...
Ho visto un pò in giro ma così piccoli non riesco proprio a trovarli..
Puoi usare zoccoli quello DIP coi piedini tondi.
http://www.2pi.info/photographic/olyconn/p8062641_cs1.jpg
Ciao...
Questo è il bello......
Dove trovarli...nella mia zona non ci sono, sai consigliarmi qualche negozio E-shop.
Sei gentilissimo per aver risposto...
Ecco lo...
http://it.rs-online.com/web/search/searchBrowseAction.html?method=retrieveTfg&Ne=4294925277&Ntt=zoccoli&Nr=AND(avl%3ait%2csearchDiscon_it%3aN)&Ntk=I18NAll&Ntx=mode%2bmatchallpartial&N=4294963054+4294956538+4294924248&Nty=1&binCount=105#breadCrumb
Jim from Australia says:
Fantastic!
Thanks so much. I got an OQO 01+ from USA only to have it die immediately & have spent month trying different repair options.
I'll give this idea a go
Fatto con l'adattatore 1,5 ampere funziona benissimo.
Conviene caricare al massimo la batteria, l'effetto combinato ha troppo assorbimento, e fa funzionare solo la batteria quindi conviene caricare la batteria al max, poi si può usare senza problemi, collegato per una settimana senza aver nesssun fastidio, non scalda neppure l'adattatore.
grazie Lorenzo
Ciao, complimenti per il coraggio di aver provato la modifica. In merito alle tensioni in uscita dal connettore, io mi ritrovo 5 volts sui pin più grossi e 6 e 5 volts sui pin piccoli rispettivame + - +.
Inoltre nella tua modifica non alimeti l'UMPC dai pin grossi, come mai, a cosa servono, e perchè sono di sezione doppia rispetto gli altri? Io avrei collegato principalmente questi.
Ciao!
Anch'io stavo chiedendo la stessa domanda al'OQO per "la cosa stupida" di mettere 5 pin invece 2 pin per alimentazione :)
Se tu metti alimentatore su quelli due grossi, non carica mai la batteria, ma l'OQO funziona.
E' probabile, dunque, che i due grossi servano da alimentazione principale, mentre i restanti tre per la carica della batteria.
Oltre questo, hai riscontrato il valore di tensione di 6V sui pin centrale e destro?
Ciao.
Basta con tre piedini per far ricaricare e accendere l'OQO.
Non servono altre due piedi grossi. Quello 6 V per caricare la batteria, queollo 5 V per alimentare l'OQO. Invece di mettere 6 V, lo metto 5 V per caricare la batteria e tutto funziona bene.
OK, questa sera lo metto in opera!!!
Ciao!
Ciao, come ti dicevo ho poi realizzato la modifica dell'alimentatore. Ho acquistato uno star da 2,5A. Finita la modifica ho effettuato la misura della corrente assorbita dai due pin, i quali assorbono 2,44A per il funzionamento dell'UMPC e 2,65A per la carica della batteria ed infine collegati assieme, con l'UMPC acceso ed in carica, hanno un assorbimento di circa 3,55A. Viste le misure la domanda è: hai mai usato l'UMPC mentre carica e se si per quanto tempo?
Teoricamente lìalimentatore si dovrebbe rompere.
Ciao!
Dimenticavo di ringraziarti per l'idea. Inoltre ho intenzione di perfezionarlo inserendo, all'altro capo dello spinotto, una presa mini USB. Tale modifica mi dovrebbe consentire di utilizzare un caricabatterie d'auto con spinotto mini USB. Farò delle prove per capire se le correnti in gioco me lo permetteranno.
Ciao e grazie mille!!
Uso l'OQO mentre sta caricando la batteria, piu di 3 ore. Non ho mai controlato la corrente perche' e' proprio scritto 2.5 A sul' alimentatore originale. Grazie per la notizia! Faccio aggiornamento il mio blog subito!
@Scrivosan: ho fatto misurare, e il risultato e' 1.54 A quando accesso e carica batteria. Secondo me, devi controlare tua modifica e di darlo meno di 4.5 V come l'alimentatore.
"Amazingly IT WITHDRAWS ONLY 150mA (0.15A)! BOTH FOR CHARGING AND SUPPLYING OQO!" - I not believe.
Maybe in this state it indicate charging, but oqo is powered by battery. Try this trick with removed battery.
great work, thats the way to find solutions to problems, i will try it the next months on my oqo 01+ .
thank you,
christoph besthorn
Hi !
Interesting article. You not need to cut down your original power supply connector (wait until warranty end). One solution that you can buy other adapter were power connector is included, like vga adapter (power in/out):
http://www.expansys.it/p.aspx?i=126295 and cut down this one.
More expensive can get the power connector from dock cable:
http://www.expansys.it/p.aspx?i=126384
I have question also myself. Original OqO 8000mah battery are very expensive , up to 250 euro.
I want build myself second battery pack. In internet are lot of smaller cheap lion batterys avaliable. Like make similar as genuine thin battery, collecting from some 3,7v batterys, making byself battery back cover(of course original battery connector is problem too).
Only question is how get these signals to work (upper described C,D,E). Seems battery having inside charging chip, like 5v comes in, usage/output 3,7v. Also from charging chip are taken charging capacity signal for windows (% of battery remaining). Can anyone suggest which charging chip use ? or maybe somebody hacked his battery and know original chip type ? Regards and success for all customizers.
I bought the VGA adapter as soon as I saw your posting! Thanks!
For you customize battery, this connector could be useful:
http://www.expansys.it/p.aspx?i=126296
Let me know when you have further info about you customize battery.
Hi Eka !
Nope, this connector would not go for me. The problem is that i need exact other side of this socket, this one which is integrated in battery. Idea is make byself good, 8000-9000mah cheap "homemade" battery for Oqo, which looks as similar as possible to original. I don't afraid handywork, most problem is get female original battery connector and charging chip (which probably inside original battery). Hope somebody can share the info.
Excellent article.
I have managed to make a new PSU for my OQO 01+ following your instructions.
I used Polymorth (http://www.maplin.co.uk/Module.aspx?ModuleNo=35511&doy=27m7) to make a mould of the original plug, and then poured epoxy into it to make a plug for the OQO.
The PSU is http://www.maplin.co.uk/Module.aspx?TabID=1&ModuleNo=49063&doy=24m8 but it does get a little warm. I have looked on ebay and might try - Item number: 310074654676 as it is a 5V 6A one.
How do you boys get around the problem that the charging circuitry is within the oem charger with your ingenious solutions? After 4 replacement chargers in 6 weeks, I'm giving my charger to an engineer so see what magic he can work...I'll post back here...
hi, great article for oqo users. unfortunately i have no soldering skills whatsoever. I would pay $ if you are thinking of making one, however. I would just need the jumper cable arrangement, I can get the generic power supply easily. heck, I'll even supply the jumper cables and/or the PSU adapter. Please think about it...
Thanks
Worked for me! When mine failed! Thanks!
so che magari ti chiedo troppo, ma sono veramente incapace a fare quello che scrivi nel tuo blog. Mi potresti fare un alimentatore? Chiaramente verrai pagato per il disturbo.
Grazie
Si, certo, ma sicuramente non ti viene economico. Devi mandarmi quello alimentatore rotto (mi serve il cavo e connettore per alimentatore nuovo, lo taglio sicuramente da quello vecchio). Compro alimentatore nuovo qui o su ebay. Faccio modificare e rimandarlo tutto a te. Quindi spendi 20 euro + doppio di spedizione. Non ho idea per quanto costa del spedizioni da Pisa.
Penso che si possa comprare appunto l'alimentatore e praticamente tagliare il connettore originale attaccando solo i 3 pin in basso :-)
semplice no?
non serve comprare altre cose , si usa cio che gia abbiamo .... con 19 euro si risolve anche il problema dell'ingombro dell'alimentatore che diventa appunto da borsa :-)
ciao, io ho comprato un alimentatore accord come quello che usi tu, e ho tagliato via lo spinotto dal'alimentatire originale dato che e' saltato(nel vero senso della parola, con tanto di nuvoletta di fumo), solo che non so quali fili devo collegare al nuovo alimentatore...mi potresti illuminare? grazie
Ti serve un multimetro per trovare qualle il piu and il meno. Puoi trovare anche i collegamenti sui conettori come quello che l'ho scritto nel mio blog con multimetro.
complimenti per l'argomento e' veramente interessante.E'possibile con i stessi principi realizzare un alimentatore da auto? per i connettori pin quale usi che li trovo tutti piccoli con passo 2,54?
per il ponticello tra i due+ in pratica li saldi in parallello dato che dalla foto non si vedono.ciao.
non dispongo di multimetro ,vorrei sapere se possibile,proprio i fili che devo utilizzare... grazie in anticipo
Non ho ancora tagliato il mio cavo perche e' ancora in garazia. Lo faccia dopo dicembre, quindi devi prestare per forza un multimetro dai amici.
ho acquistato un carica batterie da auto con presa per accendisigari da 3A,CON 4,5-5V.puo'andare bene con 4,5v,scusa il mio digiuno in elettronica.ciao.
Si...si... puo andar bene.
Fatto, con l'ausilio di un multimetro sono riuscito a collegare lo spinotto originale, ma ho dovuto collegare tutti e 5 i pin in quanto 2 dei 3 fili che portano ai tre connettori piu piccoli, sn piccolissimi, tipo doppino telefonico,e quindi dopo 15 min la parte di cavo con lo spinotto era bollente...
Devi usare quelli due grossi, perche la corrente e' abbastanza alta. Ho fatto collegamento solo i tre piedini perche io non sto usando cavo originale.
solo quelli grossi? o va bene tutti e 5?
ho seguito i vostri consigli, mi sono costruito un cavetto usb usando quello originale, collegando solo i 3 poli piccoli +-+ riesce acaricare in circa 3h con un'alimantatore da 1A ha una discreta autonomia con l'utilizzo al caricabatterie, scalda un po' il caricabatterie ma fortuantamente ha la protezione per la overtemperature. ho comprato un alimentatore 12/24V usb da 2A su ebay le cose vanno meglio!! ho recupertato la situazione in modo molto economico e, fiono adesso, abbastanza sicuro. Saluto tutti gli amanti di oqo
Bonjour Monsieur,
Toutes mes félicitations pour vos recherches & l'aide ainsi apportée aux utilisateurs d'OQO !
Il n'est actuellement plus possible d'acheter un "Power Supply OQO" pour modèle 01 &01+ chez mon fournisseur. (eXpansys.fr)
Merci, merci & encore merci !!!
Aldo
my experience:
ekawahyu's excellent approach was used with success:
1) a plug was constructed the following way: the docking
cable's power supply was "misused" as a negative form. some
fatty matter was applied to the surface of this female
adapter in order to separate the plug from the glue (see below).
five small metal tubes (in german, they called it "aderendhuelsen"
but nobody knows this word in english) were sticked to the
five contacts after soldering wires to the backend of the tubes.
a two component epoxid glue was pressed into the female
adapter between the tubes. the next day the glue was hardened
and could be extracted from the cable's female adaptor.
(of cause, one could use the oqo instead of the cable -;).
now self shrinking plastic was applied for reasons of
electrical isolation and the homegrown oqo plug was ready
to use.
2.) a powersupply from a well known electronic parts supplier
in germany was acquired having 5.0 volts stabilized output
providing 3000 milli amps - nominally. the plug of the powersupply
was removed and all five (!!) contacts of the new oqo plug were
connected. costs were some 15,00 euros.
3.) experiences: since 4 weeks the oqo is running only on
"eka power". when i come home from work, the oqo is "feeded"
for max. two hours and thats enough to go with me to the
office the next day and earn our money (both of us!).
for cases of emergency, i have a second powersupply in the
office, now. but his was used only twice. additionally, i can
work with the oqo while the battery is charged in parallel.
4.) measuring voltage and amp's during connection to the
powersupply was not checked, since everything works. of course, voltage will drop down the more voltage is needed by the battery. but this will also happen with the original oqo powersupply.
5.) by the way, the oqo delivered standard power supply works fine in my case. i just needed two other
power supplies (for the network and for the office).
summary: "eka power" works fine.
regards, christoph besthrn
Hi Eka, you're certainly a great guy. But I found a switching power supplier I intend to use to implement your creative solution. Forgive my ignorance with electronics, but the cable coming out of the power supplier only has two wires, one positive and one negative. What am I supposed to connect to the GND pin in the middle?
Thank you
If you read carefully the article, in particular the Future Work section, you see a picture notifies all of connections required. There are only 4.5V and GND. You connect every wire as seen in the picture as 4.5V to the positive of your power supply. Then connect all of GND to the negative of your power supply. That's it! Just make sure to use multimeter to check and double check the correct wire and the pin out. Also, measure that the voltage coming out from the power supply at about 5 volts. Nice to know you and happy constructing!
Hi Eka, your solution worked, thank you! I've used a power supplier delivering 5V at 3000mA
The only problem is ... I'm a terrible solder, so my solution is unstable. Now, once again the related question: would you be willing to build a neat one for me?
Needless to say, I would bear all related cost, shipping, etc.
Please let me know and we can get in touch separately.
Thanks again, ciao,
Hi Paolo, thanks for the comment. Where do you live? If you live near Pisa you could just come to my place and deliver your PS directly to me and the next day you can pick it up again. Otherwise I have no idea how much to send the power supply by post or any express courrier. Of course I am willing to help you out. Just contact me by email.
Just a suggestion to you, to avoid high current flow through the cable, I use 4.5V instead of 5V. But either way are fine.
Bonjour,
J'ai coupé le cable de l'alimentation en panne . Il y a 5 fils, 1 tresse, 1 fil noir, 1 fil rouge, 1 fil bleu & 1 fil brun.
Pour raccorder la nouvelle alimentation à découpage, la tresse & le fil bleu sont à souder ensemble à la borne - 5volts & les fils noir, rouge & brun ensemble à la borne + 5 volts et votre OQO fonctionnera sans problème !
Bye, Bye
A very helpful article - I wish I had found it before I started my own investigations! I've put 6V @ 0.5A through the OQO 01+ from a generic power adaptor + the power connector from the dead adaptor. It said it was charging...briefly. The lights now no longer come on to indicate charging, but when I press the indicator light it flashes up one of the lights showing that SOMETHING is still working. Is it possible that I have damaged my OQO?
Thanks in advance, and thanks for your very informative article.
-S
Great article thanks. Something to add... Using your pictures and notes. I can confirm that if you put power only on the large pins (d=+ve, e=0v) the OQO will run but NOT charge the battery. This would confirm that the a,b,c, contacts are for battery monitoring and charge control. Also note the device can draw up to 3amps rather than the 2.5 stated... maybe this is why the PSU units fail?
(In normal operation/use any extra power peaks would be compensated by the battery, however if you have a battery in poor condition then the extra stress would go on the PSU.)
Most of the additional power (current) peaks occour during disk access, therefore if your 'new' power supply is under-rated the OQO may not start properly and there is a possibility of damaging the HDD, which could mean you have a useless OQO....
If you are going to use this solution I would recommend using a power pack rated for 3 amps minimum. Also as it appears this solution overides some of the charge monitoring functions I wouldn't leave your 'new' power pack plugged in for prolonged periods when you aren't using the device.
Thanks got my OQO last year bought 3 PSU as they were being sold off cheep, now I have only 1 working on AC supply. so armed with your information I hacked open a PSU.
The braid is the 0V Negative for both power and charge, the black is positive supply +5 volts and the red is charge positive which is 6 volts with no load but fall rapidly under load to 4.5 @ about 2 amps. I have used +5 volts with a .22 ohm 3 watt resistor in series.
The other thin wires seem to be remote voltage sense for the main +5 volt supply and I have just left them cut and insulated with no problems.
Thanks again I just needed a push and a hammer to get going.
Paul
Thanks a lot! You know, you really saved my OQO 01+ from getting thrown out prematurely. Same shit, you know, charger burning out and the model being discontinued. I tried contacting them but got no reply. The computer itself hasn't been used in over a year because of the problem. Today I decided to finally do something about it, and miraculously find your blog entry. An old unused mobile phone charger got slaughtered and modified - and the wee OQO model 01+ lives yet again! Congratulations, you saved the day!
Thanks greatly for posting this article... I just purchased an oqo at a thrift store for $20 and can't afford a new power supply, so creating a makeshift one might just be my best bet! Hopefully I can pull it off :p
Fantastic, thank you! Have hacked my oqo cable to bits, and have all cables connected as you suggest, with the plug now feeding correct voltages to the right pins (have checked with multimeter). Unit works fine, except for the fact that the battery is not charging, and windows won't even recognise the presence of a battery! aNYBODY GOT ANY IDEAS?
Sorry to hear that there are issues for the OQO model 01 charger. Hope Ekawahyu's solution can fix the issues.
I'm from the OQO model 02 charger manufacturer, Amperor. If you have issues with the model 02 power adapters, please contact me at howard_chang"at"amperor.com. Or, you can check out our product page at: http://www.amperordirect.com/c/b-oqo/index.html.
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