Hi...
I'm building a power amplieir. I want to connect my power transformer with two bridge rectifiers so that the output will be 2 x +- 24 volt. how should the transformers wires and bridge rectifiers be connected?

Thanks

 

Hi...
I'm building a power amplieir. I want to connect my power transformer with two bridge rectifiers so that the output will be 2 x +- 24 volt. how should the transformers wires and bridge rectifiers be connected?

Thanks

As Shown. You need 2 of these.

Transformer White & Blue is One set of AC input
. . . . . . . . . Yellow & Green is the Second set of AC input

Ramesh

 

As Shown. You need 2 of these.

Transformer White & Blue is One set of AC input
. . . . . . . . . Yellow & Green is the Second set of AC input

Ramesh

what about if i want a common ground for them?

 

If separate AC secondaries, the DC commons can be connected.
Max.

 

If separate AC secondaries, the DC commons can be connected.
Max.

you can see the attached diagram in thread nr 1.

 

I just mentioned in case someone tried it with windings in common.
Max.

 

Yes, like Ramussons suggested, make two circuits like that and connect the dc sides of the rectifiers in series, i.e. negative of top rectifier connects to positive of bottom rectifier. This becomes the common or 0V rail. The top rectifier's positive becomes your positive rail and the bottom rectifier's negative becomes your negative rail.

 

I took it to be Commons connected/referenced together not in series?
Max.

 

As Shown. You need 2 of these.

Transformer White & Blue is One set of AC input
. . . . . . . . . Yellow & Green is the Second set of AC input

Ramesh

then i still have two of each wires left..

 

Try this:

(FYI: It's not a guess)

 

then i still have two of each wires left..

The 2 wires are Orange and Orange, which, as per your post, are 230 V AC.

Ramesh

 

2 x +- 24 volt

I took that to mean two +/- 24V supplies.

 

That was my take also?
With the intention of making both -ve's common?
Max.

 

Try this:

(FYI: It's not a guess)

Check out your bridge: 2 cathodes = Pos. out and 2 anodes = Neg. out.

 

As far as being two +/- 24V supplies, that's not going to happen with two 18 volt secunder coils in the illustrated transformer. You can get one. You can however, get two +/- 9 volt supplies.

 

As far as being two +/- 24V supplies, that's not going to happen with two 18 volt secunder coils in the illustrated transformer. You can get one. You can however, get two +/- 9 volt supplies.

Doesn't the secondary voltage times 1.41 minus two diode drops still apply to this circuit? 18 X 1.41 - 1.4 = 23.98 Isn't that close enough for government work?

 

Doesn't the secondary voltage times 1.41 minus two diode drops still apply to this circuit? 18 X 1.41 - 1.4 = 23.98 Isn't that close enough for government work?

It is under most circumstances. But I took it as the OP wanted two + and - supplies. If they wanted one + supply and one - supply, that might be "close enough" depending on the load and the current rating of the transformer.

 

Thanks Johann, serves me right for not double checking an image I got off teh interwebs.

This is what I meant. Really. Note the dots on the secondaries, that's important. Colors same as the original (I just couldn't fit them at 5 o'clock in the morning).

I'll be quiet now.