Negative supply with CT tranny

Miniwatt · 24th January 2011, 04:06 PM

L.S.

I'm putting together a new amp with old iron. The power xformer has a center tap, but the xformer in the original schematic doesn't.
No problem for the HT, but I'm not so familiar with negative supplies, especially how it's done here:

So my question is: how do I adapt this to a CT transformer?

Thanks!

Mooly · 24th January 2011, 04:42 PM

It's usually the SS forums I frequent but no matter. What's the secondary voltages of the new CT tranny ? It would need to be a 300-0-300 to use the CT as the ground. The CT would go to ground, (Your bridge is shown reversed by the way). So CT to ground, positive output from bridge to +400v and negative side of bridge to -400v The two diodes and 22uf are ommited. Diodes in the bridge drawn reversed

Also you don't need adapt... if the secondary voltage is correct you can ignore the CT. So if it's 150-0-150 just ignore the CT.

DF96 · 24th January 2011, 04:45 PM

Assuming the centre-tap will be grounded, it is actually simpler. You know how to build a positive supply from a CT transformer with two diodes. Just do the same thing for a negative supply, with the diodes reversed. The four diodes can be combined in a bridge, but the wiring will be different from that shown above.

Miniwatt · 24th January 2011, 05:19 PM

Thanks a lot, guys! Really appreciate it.
I just ate so my brain is on standby now, but I'll let it sink in.

24th January 2011, 04:06 PM	#1
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	Negative supply with CT tranny L.S. I'm putting together a new amp with old iron. The power xformer has a center tap, but the xformer in the original schematic doesn't. No problem for the HT, but I'm not so familiar with negative supplies, especially how it's done here: So my question is: how do I adapt this to a CT transformer? Thanks!

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24th January 2011, 04:45 PM	#3
DF96 diyAudio Member Join Date: May 2007	Assuming the centre-tap will be grounded, it is actually simpler. You know how to build a positive supply from a CT transformer with two diodes. Just do the same thing for a negative supply, with the diodes reversed. The four diodes can be combined in a bridge, but the wiring will be different from that shown above.

24th January 2011, 05:19 PM	#4
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	Thanks a lot, guys! Really appreciate it. I just ate so my brain is on standby now, but I'll let it sink in.

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