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Old 2nd January 2011, 02:37 PM   #1
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Default Power transformer for Firefly Amp?

Hi I have a little problem.
Specs for transformers are messing with my head.
Look at the pictures

http://img41.imageshack.us/img41/9471/pic1nb.jpg

http://img209.imageshack.us/img209/3697/pic2zs.jpg

On first it says on secondary 207VAC and after a Gretz it says 265V.
How is that posible?

On other pic there is Hammond transformer. His specs are 190-0-190 on secondary. And again it is 265V after two solid-state diodes

Could someone tell me how it is possible?
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Old 2nd January 2011, 03:50 PM   #2
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I think what happens sometimes is, engineers and designers, casually draw up these up - not paying attention to the finer details.

here's a good rules of thumb:

HALF WAVE (one diode) = acV x 1.1 = dcV

FULL WAVE (two diodes w/ grounded CT) = acV x 1.4 x .5 = dcV

FULL WAVE BRIDGE (four diodes, + or - node grounded) = acV x 1.4 = dcV
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Old 2nd January 2011, 04:12 PM   #3
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Time to do some studying about rectifiers!
This is very useful:
PSUD2
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Old 2nd January 2011, 05:41 PM   #4
Zibi is offline Zibi  Poland
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"I know nothing about electronics and it's enough to build a tube amplifier."
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Old 4th January 2011, 09:41 PM   #5
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Ya. Thanks. I'm noob. :S
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