σ24 transformer output
Jan 1, 2010 at 1:27 AM Thread Starter Post #1 of 12
johnwmclean

johnwmclean

Aka: capone, bignurse.
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I built a σ24 this morning using this transformer:

MYRRA|44087|TRANSFORMER 1.5VA 12V | Farnell Australia

I’m sure there’s some reason for this and would like to know why, the output voltage across J2 is 19.6V. I was expecting 12V as that’s the secondary voltages spec. Why is this so?

Happy New Year to all.
smily_headphones1.gif
 
Jan 1, 2010 at 10:09 AM Post #9 of 12
Quote:

Originally Posted by wink /img/forum/go_quote.gif
Happy New Year John.


Happy New Year Erwin.
 
Jan 1, 2010 at 4:05 PM Post #10 of 12
Quote:

Originally Posted by wink /img/forum/go_quote.gif
Pretty lousy regulation.........


Well there isn't exactly much margin in a 1.5VA transformer, is there?
 
Jan 1, 2010 at 9:32 PM Post #11 of 12
Beefy,
You would still expect better regulation than that..
Unless the desired requisite was the smallest size possible, and over-voltage wasn't a consideration.
 
Jan 1, 2010 at 9:45 PM Post #12 of 12
Quote:

Originally Posted by wink /img/forum/go_quote.gif
Beefy,
You would still expect better regulation than that..
Unless the desired requisite was the smallest size possible, and over-voltage wasn't a consideration.


These little transformers are indeed the smallest size possible. Look at the S24 PCB and you will understand.
 
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