I´m trying to make a 24 V trafo from my 30 V one. The principle is clear - unwind wire until matching required voltage. But I get 23,6 or 24,4 volts and nothing between; not able to match exactly 24,0 V 
. When wire ends on top of core = 23,6 V. 3/4 winding later = 24,4 V. Do I have to cut the wire inside of the core ? What´s the trick 
?????
The trafo is a fat 1000 VA 230 prim. with 4 secondaries.
Thanks a lot ...
. When wire ends on top of core = 23,6 V. 3/4 winding later = 24,4 V. Do I have to cut the wire inside of the core ? What´s the trick ?????The trafo is a fat 1000 VA 230 prim. with 4 secondaries.
Thanks a lot ...
At least where I live, mains voltage can change enough every few minutes to vary that much! If 24V -*Exactly*- is needed may be better staying with 30V and building a regulator to bring it down to 24.
Anyway I don't think there is a "trick". If you were an manufacturer making thousands of these you would also have the option to change the number of primary turns so as to get more nearly the right ratio. In your case you only can change the primary.
I don't see any reason why fractional turns wouldn't work except that directing the wire away may result in an awkward configuration with respect to mounting.
Anyway I don't think there is a "trick". If you were an manufacturer making thousands of these you would also have the option to change the number of primary turns so as to get more nearly the right ratio. In your case you only can change the primary.
I don't see any reason why fractional turns wouldn't work except that directing the wire away may result in an awkward configuration with respect to mounting.
Measure several times over a period of hours and days. If it is always the same - lucky you!
Word of warning (apart from checking mains voltage in a safe manner) -- don't let yourself get too fascinating with exploring the nature and quality of mains voltage. Somethings are better not to know. I made this mistake -- discovered the mains DC offset, discovered the spectra, even looked at the current wave form. Now I'm majorly depressed. It's a small miracle that even the doorbell works!
sam9 said:
Measure several times over a period of hours and days. If it is always the same - lucky you!
Now I'm majorly depressed. It's a small miracle that even the doorbell works!
Exactly, don't measure over longer periods.....it will only make you depressed, and what you really need to know is the voltage here and now, in order to calculate what the output should be in order to be 24V at 230V.
Magura
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