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Old 29th May 2011, 03:20 AM   #1
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Default power supply guide

Hi i have two transfomers 4A 12-0-12.I want to build a power supply using the two transfomers so i will get 12v 8A if possible?.Any help would be appreciated.Schematics to
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Old 29th May 2011, 12:38 PM   #2
kubeek is offline kubeek  Czech Republic
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You will get 2x12V 8A if the transformers are identical and you parallel them.
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Old 29th May 2011, 12:47 PM   #3
AndrewT is offline AndrewT  Scotland
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do you need 12Vac @ 8Aac
or
do you need 12Vdc @ 8Adc?
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Old 29th May 2011, 12:59 PM   #4
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The transfomers are indentical
i need 12vdc @8A
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Old 29th May 2011, 03:36 PM   #5
AndrewT is offline AndrewT  Scotland
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for 12Vdc @ 8Adc you need a 9Vac 150VA to 300VA transformer
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Old 29th May 2011, 06:33 PM   #6
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I dont have any other transfomer,wanted to use what i have.
What if i put the two in parallel just like "kubeek" said but i only used the center taps and 12v and leave the other 12v out are the amps going to increase?
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Old 29th May 2011, 06:54 PM   #7
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am not sure for the amps for the bridge
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Old 29th May 2011, 07:57 PM   #8
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Parallel the transformers normally and use a full-wave rectifier with the center tap as ground and a choke filter.
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Old 29th May 2011, 08:03 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by ian33 View Post
i have two transfomers, 4A 12-0-12.
Quote:
Originally Posted by AndrewT View Post
for 12Vdc @ 8Adc you need a 9Vac 150VA to 300VA transformer
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Originally Posted by ian33 View Post
I dont have any other transfomer,............What if i put the two in parallel
no matter how you try to connect two 12-0-12Vac, 4Aac, you cannot get 9-0-9Vac, 16Aac
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Old 29th May 2011, 08:28 PM   #10
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Originally Posted by sofaspud View Post
Parallel the transformers normally and use a full-wave rectifier with the center tap as ground and a choke filter.
use a choke in series with the + volts?
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