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σ24 transformer output

post #1 of 12
12/31/09 at 10:27pm
Thread Starter 
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.
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post #2 of 12
12/31/09 at 10:47pm
http://www.myrra.fr/documentation/44..._catalogue.pdf

The unloaded voltage specified for #44087 is 19.3 volts, what's the problem?
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post #3 of 12
1/1/10 at 12:02am
Thread Starter 
Oh yeah, thanks MisterX - I didn’t look hard enough.
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post #4 of 12
1/1/10 at 2:00am
Pretty lousy regulation.........
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post #5 of 12
1/1/10 at 2:01am
Happy New Year John.
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post #6 of 12
1/1/10 at 2:16am
Quote:
Originally Posted by wink View Post
Pretty lousy regulation.........
Um maybe i am missing a joke, but a transformer would have 0 regulation.
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post #7 of 12
1/1/10 at 2:40am
Quote:
Originally Posted by m1abrams View Post
Um maybe i am missing a joke, but a transformer would have 0 regulation.
even unloaded!

(lol)
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post #8 of 12
1/1/10 at 2:42am
Quote:
Originally Posted by m1abrams View Post
Um maybe i am missing a joke, but a transformer would have 0 regulation.
Voltage regulation : TRANSFORMERS
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post #9 of 12
1/1/10 at 7:09am
Thread Starter 
Quote:
Originally Posted by wink View Post
Happy New Year John.
Happy New Year Erwin.
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post #10 of 12
1/1/10 at 1:05pm
Quote:
Originally Posted by wink View Post
Pretty lousy regulation.........
Well there isn't exactly much margin in a 1.5VA transformer, is there?
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post #11 of 12
1/1/10 at 6:32pm
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.
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post #12 of 12
1/1/10 at 6:45pm
Quote:
Originally Posted by wink View Post
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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