i am using Office 2007 for the spreadsheet......i attached revised spreadsheet showing efficiencies at various primary currents...the short circuit testing is done with all secondaries shorted together, with the aid of a variac, the voltage is slowly increased until a specified current flows as registered in the ammeters, the voltage at which the specified current flows is basis for computing copper loss in watts, that is v x i........
i am building my database so i can compare losses between types of cores, soon i will be making the same dimensions and coils but will use higher grade type irons......
the core loss and copper losses can then be compared with a comparable traffo using better grade iron core materials...
the spreadsheet is self explanatory....
the core loss and copper losses can then be compared with a comparable traffo using better grade iron core materials...
the spreadsheet is self explanatory....
Attachments
Cool Tony... those traffos popping out like daisy's...
you are responsible for shortage of 2" core and copper at deeco
Will be joining the party shortly as I have 4 pcs 200Watts output booster traffo EI core. Will be taking photos and exact measure of IE iron core in the next few days...
thanks rolandong......i have other sources too....
hi tony,
i am very sorry for late construction,
i bought the gage wires what u mention,
i cant wind the whole wires inside the window, its popping out, so any solution?
as i said, wire gage numbers i use may not be the same as wire numbering used in India....
anyway, use wooden mallet to hammer out the bulge to make it fit, you can also use a table vise.....
An externally hosted image should be here but it was not working when we last tested it.
Tony,
Here is 4 booster output traffo I wanted to recycle.
Instead of throwing this out in a junk, I was inspired by your good thread to try as well. Core size is only 1 & 1/4". If combined by 2's I can get 3.5" stacked each.
Please help me estimate possible VA we could get, wire sizes (primary & sec) and number of turns for 24-0-24Vac secondary. Is it better to combine all EI core into 5-7" stack? Or can I possibly have 2pcs 600VA which I can use for small amp like F5?
Here is 4 booster output traffo I wanted to recycle.
Instead of throwing this out in a junk, I was inspired by your good thread to try as well. Core size is only 1 & 1/4". If combined by 2's I can get 3.5" stacked each.
Please help me estimate possible VA we could get, wire sizes (primary & sec) and number of turns for 24-0-24Vac secondary. Is it better to combine all EI core into 5-7" stack? Or can I possibly have 2pcs 600VA which I can use for small amp like F5?
Attachments
use my spreadsheet.
it is designed specifically for these kinds of questions.
everything is a variable.
http://johansense.com/bulk/spreadsheets/tranformerdesign1.ods