power supply guide

[ian33]

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

[kubeek]

You will get 2x12V 8A if the transformers are identical and you parallel them.

[AndrewT]

do you need 12Vac @ 8Aac
or
do you need 12Vdc @ 8Adc?

[ian33]

The transfomers are indentical
i need 12vdc @8A

[AndrewT]

for 12Vdc @ 8Adc you need a 9Vac 150VA to 300VA transformer

[ian33]

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?

[ian33]

am not sure for the amps for the bridge

[sofaspud]

Parallel the transformers normally and use a full-wave rectifier with the center tap as ground and a choke filter.

[AndrewT]

Originally Posted by ian33

i have two transfomers, 4A 12-0-12.

Originally Posted by AndrewT

for 12Vdc @ 8Adc you need a 9Vac 150VA to 300VA transformer

Originally Posted by ian33

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

[ian33]

Originally Posted by sofaspud

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?