Regulated Power Supply

[Jrp27]

One of the power supply boards i purchased has two 0-25-25 markings. Here is the pic:

My question is that do i need a transformer with two 2 25-0-25 outputs?


This is the finished board, incase you are wondering : Lusya Power Supply For NAIM NAC152XS Preamplifier 2 way DC24V Regulator A3 001 - AliExpress

 

[FauxFrench]

I can't load the picture.

 

[schillg11]

I can't load the picture.

Hi,
use from your browser 'open link in a new tab' and it will be displayed

 

[Jrp27]

I can't load the picture.

Sorry my bad. Replaced the image

 

[FauxFrench]

That was quick, now it works. Yes, that is meant for a transformer with a midpoint (24Vac-0-24Vac) or two separate 24Vac windings where you connect them in series yourself.

 

[Jrp27]

That was quick, now it works. Yes, that is meant for a transformer with a midpoint (24Vac-0-24Vac) or two separate 24Vac windings where you connect them in series yourself.

So if i am not wrong. Here are the specs that i need.

Primary: 0-230V
Secondary : 25-0-25
25-0-25

Is that right ?

 

[nenad88]

Two transformers with 25 0 25. It is possible to do it with one if you connect jumpers, no?

 

[Mark Tillotson]

No you don't need two windings.


Connect the jumper links, use one centre-tapped winding and you have full-wave rectification, which is the most efficient way to use a transformer.

If you already have two secondaries, parallel them (check the polarity before doing this!), and connect the jumpers.

If you have two transformers, don't connect the jumpers, but the transformers will be used less efficiently (only half-wave rectification).

 

[FauxFrench]

So if i am not wrong. Here are the specs that i need.

Primary: 0-230V
Secondary : 25-0-25
25-0-25

Is that right ?

A single transformer with 25Vac-0-25Vac (24-0-24 is standard), that can pull both rectified channels current wise, is what you need. Use the jumpers.

 

[Jrp27]

So i asked the supplier and he suggested this....

This is the transformer that he had sent me ( which i have with me right now )

and this is the wiring he suggested

Will this work?

 

[FauxFrench]

It looks OK. You have 220V on the net in India?
You connect one blue wire to one white wire and measure from the other free blue wire to the free white wire. Either you have around 52V (AC) or you have only a couple of volts. If you have only a couple of volts (AC), it is the other white wire you have to connect to the blue wire.
1A is sufficient for both channels?

 

[Jrp27]

It looks OK. You have 220V on the net in India?
You connect one blue wire to one white wire and measure from the other free blue wire to the free white wire. Either you have around 52V (AC) or you have only a couple of volts. If you have only a couple of volts (AC), it is the other white wire you have to connect to the blue wire.
1A is sufficient for both channels?

Thanks will test it.

Yes 1Amp should be sufficient. It's a preamp so 1Amp should suffice i guess..