Make your own Power Transformer

I'm sticking with the functional definition: if it's used at 1500VA, then it is a 1500VA transformer.

I didn't say that there was no fan and it isn't continuously loaded - more intermittently than in an oven.

So what? It's been working perfectly for 10 years. How would it work better if I had gone to the trouble of scoping the primary current and adding turns? Running cooler doesn't count as "working better".

**

** 400VA would be the limit under the conditions as stated.

What you failed to mention is your problem.

** It needed mentioning.

** Aside from humming and running hot all the time.... ** No mention of "scoping" came from me.

** Does in most folk's book. I can see you are made from different stuff.

..... Phil

With a resistive load, yes; with a rectifying load, could be either or both.

could also be much higher with nonlinearity.

NT

These days, the bobbin could possibly be 3D-printed?

--
RoRo

If you don't mind it melting.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
https://hobbs-eo.com

Not so -- I might not be inclined to trust an extruder product, at least not without a much fancier material than ABS or PLA (and in which case, you may need a special extruder head to handle the much higher temp, and possibly the abrasiveness if it's glass fiber reinforced).

There are some pretty fantastic materials available in UV-cure resin, though! Just a matter of how much you're willing to pay for it, and how much you'll be able to use within its shelf life...

Tim

--
Seven Transistor Labs, LLC 
Electrical Engineering Consultation and Design 
Website: https://www.seventransistorlabs.com/

Yeah, but you need a UV laser system to cure it. It would probably be cheaper to machine it from solid yourself than to get it printed.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC / Hobbs ElectroOptics 
Optics, Electro-optics, Photonics, Analog Electronics 
Briarcliff Manor NY 10510 

http://electrooptical.net 
http://hobbs-eo.com

Go to a motor rewind shop and ask for the paper they use to insulate the wire when they put it in the slot. It' not paper actually and will withstand high temperatures. Then use their high temp tape to put together a bobbin. Mikek

Improvise?

--Spehro Pefhany

Probably Nomex.

Yep, I probably still have some in my junk box from the early 80's. I used it to insulate between windings on pot core transformers in the late 90s. Mikek

We used it in high power inductors and transformers in the 80s to 90s. Never had a problem.