Center tap toroidal transformer

[fschris]

Where in the heck do I buy a toroidal transformer with a center tap... so it would have a ground .... I have look all over the internets...
i need something like a 45v-0-45 and and a secondary 15v-0-15v.. it is for that mono style amp plate i have been yapping about... i already have it (the amp plate) on ebay but i am still baffled i cant find one for it...

[nigelwright7557]

Many toroids come with split primaries for 110v or 220v appliactions.
Use the centre tap off one of these.

[dagerman]

Originally Posted by fschris

Where in the heck do I buy a toroidal transformer with a center tap... so it would have a ground .... I have look all over the internets...
i need something like a 45v-0-45 and and a secondary 15v-0-15v.. it is for that mono style amp plate i have been yapping about... i already have it (the amp plate) on ebay but i am still baffled i cant find one for it...

Couldn't you use one of these? Antek - AS-4445
and wire the two 45V secondaries into a 45-0-45 and the two 15V ones into 15-0-15?

I know, I didn't really answer your question, but maybe that's a workable workaround?

[fschris]

I bought this... but at the the risk of killing my self or my amp I am not sure how to hook it up... Antek - AN-5445

[CharlieLaub]

Try Antek. All of their toroidal transformers have dual secondaries. You just join the secondaries to form the center tap. Some of their transformers have something like you describe, but usually not with a dual low voltage secondary pair, just one low voltage secondary.

-Charlie

[fschris]

Like i have said the power board for the is amp has 4 pins (input for power) on the hi side and 3 on the lower side 15v Gnd 15v....

[fschris]

I could just buy to transformers... one for the 15 V side .. but i still dont understand how to get a ground from it...

[dagerman]

Originally Posted by fschris

I bought this... but at the the risk of killing my self or my amp I am not sure how to hook it up... Antek - AN-5445

Hmmm, that doesn't really fit your requirements for the low voltage (15V), since one secondary is a little too low and the other one a little too high. Besides, it only has one 45V secondary.

Let's assume you get the one that has two 45V secondaries and two 15V secondaries. Now lets 'label' the wires H1/H2 for the first 45V secondary, H3/H4 for the second and L1/L2 and L3/L4 for the 15V secondaries.

You would connect L2 and L3 to form your center tap, now labeled L23. You'd have 15V between L1 and L23, and 15V between L4 and L23, no?

You would do the same with the two 45V secondaries, but it sounds like your board has hookups to connect those directly. Is there a picture of the board or a circuit diagram you could share?

It would also be useful to know what your current requirements are for the secondaries. The AS-4445 puts out 4.4A on 45V and 2A on the 15V secondaries.

[fschris]

Dagerman... you have made me understand more about how to find a solution to this puzzle than I have found or asked anywhere else !

But yes I do have 2 links worth of pics...

https://skydrive.live.com/redir.aspx...78B797AFB!1649

and

https://skydrive.live.com/redir.aspx...78B797AFB!3102

[dagerman]

So from looking at the PCB traces in the pictures it seems that the 15V side would work as said before. L23 to the middle pin of the small connector and L1 and L4 to the other two. Judging by the size of that bridge rectifier (since the type is unreadable), my GUESS is that a 2A secondary is probably about right.

The 45V side is less clear, because
a) there seem to be two bridge rectifiers
b) they seem to be mounted on the aluminium panel for cooling
c) not all relevant traces to figure this out appear to be on the bottom side of the PCB

This makes any further thoughts nothing more than WILD GUESSes, so I am going to abstain, especially since that rail seems to me sized for at least 5A, given the wires used and the PCB traces being fattened with solder.

Unless you can find someone who has one of those subs and is willing to pop it open and take a look, you are probably not going to get satisfactory results by 'trying' things. Any searches for schematics for this panel also came up empty for me. How do you even know you need 15V and 45V...?