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Old 29th March 2020, 01:49 PM   #1
ToFa is offline ToFa  Bangladesh
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About these transformers
Default About these transformers

Hi there,

I was just testing these transformers I've got from wasted electronics. The big one is giving 11.xx Volts AC and the small one is 9.xx Volts AC but when I'm using a full bridge rectifier made out of 1N4007s and a 1000uF 35V capacitor I'm getting 22.xx Volts DC from the big one and 14.xx Volts DC from the small one.
Small one's DC voltage looks alright but I don't understand why the big one's DC voltage is multiplied this much. Why is it giving higher DC voltage? Is it because the current is higher and the diodes couldn't pass that much current. So in order to balance the power the voltage has raised!!!
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Old 29th March 2020, 02:06 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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Probably because there is no load.
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Old 29th March 2020, 02:25 PM   #3
KatieandDad is offline KatieandDad  United Kingdom
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As Nigel said, provide each with a moderate 100mA load and then take your measurements again.
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Old 1st April 2020, 11:07 AM   #4
ToFa is offline ToFa  Bangladesh
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About these transformers
Thanks both of you sir. I understand it now.
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