Brian GT PSU board with Center Taped Transformer

[ads2]

Hello,

I have bought the LM3886 gainclone kit from ChipAmp.com

the PSU board look like this :


the problem is that my transformer is center taped (3 wires) instead of 4 wires.

Is there a way to use this transformer with that PSU board ? and how ?

If not, there's some PSU boards on Ebay like this one Amplifier Power Supply Assembled Kit for DIY NEW en vente sur eBay.fr (fin le 08-janv.-11 10:26:00 Paris) that could be suitable ?

Regards

[linuxworks]

I bought the same brian-gt boards. I just used dual secondary trafos for that one.

the peter daniels kit does seem to 'support' CT style trafos. he documents where to make changes (4 diodes instead of 8, etc) on his website.

btw, that diagram you show is wrong, isn't it? the 2nd bridge is backwards, it seems. wonder why no one ever fixed that (?)

[toufu]

just disregard the ct and run secondery to both ac's.

[ads2]

Linuxworks, the document is from Brian web site, so hope the board are ok.
Will look at Peter web site.
Toufu,

diyAudio Member

Join Date: Jun 2008
Location: San Francisco

just disregard the ct and run secondery to both ac's.

If I disregards the CT I will get 48V instead of 24V at the ACs?

[linuxworks]

Originally Posted by toufu

just disregard the ct and run secondery to both ac's.

no, that's not optimal. that often (according to reports) creates hum and loops.

[ads2]

he documents where to make changes (4 diodes instead of 8, etc) on his website.

do you have the link ? don't find it...

[Peter Daniel]

I explained it here: Center tap torroid wiring to peter daniels kit???

[ads2]

Thanks Peter for the link.
the PSU board of Brian LM3886 and yours are quite different, do you think this can apply in my case also ?

[Peter Daniel]

The layout and traces, although may look different, are basically the same, so the mod will work with his boards as well.

[linuxworks]

his current boards include room for both the diodes and filter caps. if the filter caps part assumes dual secondaries, I wonder if it really will be straightforward..

I have both of your kits but have not looked at it in detail on brian's since it did not look obvious at first glance. I am curious, though. searches did not turn up any specific howto on the brian boards like it does on yours.