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Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
I've personally struggled much more trying to find high power ferrite cores than finding MOTs... And many of the MOTs I find are like 5-10 years old! I reckon there won't be a shortage any time soon for dumpster divers, and like Anders M. says, there's still HV stuff in the new ones.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ScotchTapeLord wrote ...
I've personally struggled much more trying to find high power ferrite cores than finding MOTs... And many of the MOTs I find are like 5-10 years old! I reckon there won't be a shortage any time soon for dumpster divers, and like Anders M. says, there's still HV stuff in the new ones.
i too have had trouble finding ferrites of large cross section and short path.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
A few more advantages: They run at quite high frequencies, and with some modifications, they are nice for driving voltage multipliers. Also, the secondary consists of quite few turns, so rewinding them for higher voltage is quite easy. Insulation might be a bit of a problem though, but immersing the whole transformer in oil should take care of that.
I don't see why people are so negative to these new inverters, if you are willing to do a bit of research and work, they can be much more useful than the old kind, and the old kind won't be in shortage any time soon.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Anders M. wrote ...
I don't see why people are so negative to these new inverters, if you are willing to do a bit of research and work, they can be much more useful than the old kind, and the old kind won't be in shortage any time soon.
I think people like the simplicity of a simple transformer, which has few parts to go wrong.
Minimalist circuit designs also have aesthetic appeal.
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
con you drive those cores with a zvs Flyback driver. Also where is a good place to get a lot of flyback? i go to thrift stores and bye one tv for about 10 bucks and only get one flyback at a time :(
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Depending upon the brand and configuration, there are some things that can be harvested from the inverters: it all gets down to what you'd think you may use. I agree that the old MOTs won't be gone anytime soon - but the quality ones will start to get scarce due to cost factors.
I've pulled a great many MOTs and found that the really good ones (quality construction, strength) come from commercial MWO. The general run of MOTs are getting MUCH cheaper in construction. While the larger ones with more "flexibility" in design & construction are found in commercial units (Toshibas) which are large, robust and well made. The smaller units have very little room to alter the secondaries and crowd their windings in general.
The inverters vary quite a bit. Some are so cheaply mfg, I wouldn't consider using them for anything BUT parts. They're fragile; very often why the MWO was junked in the 1st place. The more quality units have fuse or breaker protection and appear to have better heat dispersion in their design. The "LOPT" in many of them is often difficult to remove cleanly. As opposed to TV LOPT's, they have an "open" design & while this allows alteration, it also makes them delicate.
I do not have an engineering background & do not feel comfortable with using them "as is" for a HV source. There is no question that they produce a potentially lethal level of current and they are a very open design. However their components are often expensive - bought separately & there (IMO) lies their value.
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New microwaves " with Inverter Technology " what !? My precious MOTs !?
