| Official Luthiers Forum! https://www.luthiersforum.com/forum/ |
|
| transformer 220-110v https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=17936 |
Page 1 of 1 |
| Author: | Frank Aarre [ Wed Jul 09, 2008 5:07 pm ] |
| Post subject: | transformer 220-110v |
i'm in the market for a step-down transformer to work with my heating blanket i found this on e-bay. Any thoughts about it, will it work, the blanket is rated 800w. I'm very sceptical of this, but the price is certainly right, compared to other products i've seen. Thanks, Frank |
|
| Author: | Mike OMelia [ Wed Jul 09, 2008 5:26 pm ] |
| Post subject: | Re: transformer 220-110v |
I dunno... Contact LMI or Stew-Mac... they sell the proper converters. That site looked very goofy to me. Mike |
|
| Author: | Frank Aarre [ Wed Jul 09, 2008 5:31 pm ] |
| Post subject: | Re: transformer 220-110v |
slackkey_mike wrote: I dunno... Contact LMI or Stew-Mac... they sell the proper converters. That site looked very goofy to me. Mike yes, seemed goofy to me too, getting a decent converter from the states would not be worth it for the price of shipping(norway), should have checked around a bit more before i bought the blanket it seems.... ![[headinwall]](./images/smilies/headbangwalluf8.gif "Mad")
|
|
| Author: | Tom Barton [ Wed Jul 09, 2008 6:21 pm ] |
| Post subject: | Re: transformer 220-110v |
Hi Frank - I don't know what this device is for certain, but I suspect it is simpy a diode (rectifier) that blocks the AC line voltage during half the cycle. So you end up with the maximum voltage across the heating blanket being half the 220V. If all that is the case, the blanket should work ok. You may have problems with using a router speed control or similar to adjust the heat, though. Hopefully others will chime in here who know exactly what the little box is. For sure, it is not a transfomer, which for this kind of power would be much larger, much heavier, and pricey! Tom Edit - Did a google search - look here [url][/http://www.220converters.com/store/p/121-1600-Watts-Travel-Voltage-Converter.html] Looks like your converter - notice the warning about 30 minutes maximum use time Tom |
|
| Author: | Chris Paulick [ Wed Jul 09, 2008 7:00 pm ] |
| Post subject: | Re: transformer 220-110v |
Blocking half the cycle won't change the voltage as it will still be 220v. Just pulsating 220 v + or 220v -. I don't know what that box is but is a small transformer with 2 to 1 windings that costly ? Too bad you didn't buy 2 blankets then you could have wired them in series and used the 220v. With the blanket it won't matter that you are at 50 cycles instead of our 60 cycles. You just need to step the voltage down. |
|
| Author: | Tom Barton [ Wed Jul 09, 2008 7:35 pm ] |
| Post subject: | Re: transformer 220-110v |
 Yup, same peak voltage, of course (long day...). This will reduce the average power to the blanket by a factor of two, I'm pretty sure. But the high peak voltage and current will kill the blanket, and probably present a safety hazard. Tom |
|
| Author: | Frank Aarre [ Thu Jul 10, 2008 12:08 am ] |
| Post subject: | Re: transformer 220-110v |
Hmm, If i get a second blanket and wire them in series can i use the heat controller? I got the blanket+controller combo from john hall. |
|
| Author: | Mike OMelia [ Thu Jul 10, 2008 12:51 am ] |
| Post subject: | Re: transformer 220-110v |
Please, when it comes to AC current, buy proper equipment. If you are not sure what is going on, then stay away from it. LMI or Stew-Mac (can't remember which) posts stern warnings about this. Mike |
|
| Author: | vachterman [ Thu Jul 10, 2008 2:49 am ] |
| Post subject: | Re: transformer 220-110v |
Frank, might even be worth checking with John Hall. I and several other builders in Israel, got 110V blankets from John. maybe, since it seems your blanket is still unused, you could work something out. just a though... Udi. |
|
| Author: | martinedwards [ Thu Jul 10, 2008 4:19 am ] |
| Post subject: | Re: transformer 220-110v |
In work we have a lot of 110v tools from the olden days when they said that we couldn't use 240 for safety reasons. I have a transformer that weighs about the same as a car battery and the 110v tools plug into it. 1/3 sheet sander, strip bender etc. the problem is going to be shipping if you buy one as they are HEAVY. try a pro tool store, they might still stock them here y'go this sort of thing, you should be able to get one locally. http://www.ryness.co.uk/SearchResults.aspx?txtSearch=110%20volt |
|
| Page 1 of 1 | All times are UTC - 5 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|