CT Trafo and floating psu for circlotron?

markusA · 23rd August 2011, 09:58 AM

Is it possible to get all 4 floating bridgesupplies from a single CT transformer when building a circlotron 2ch buffer?

I know it's a big NONO if they share a common reference but I'm unsure when it comes to this circuit?

I drew up a quick sketch to simplify understanding.
The common element is the connection to ground (for signal purposes) but none of the supplies are referenced to ground?

I got a nifty little transformer that would make life easy if I could use it...

DF96 · 23rd August 2011, 10:18 AM

You can't get separate floating supplies from one winding unless you do some very clever things with capacitors. General rule: one winding=one supply (which could be CT), or maybe two supplies sharing a connection.

markusA · 23rd August 2011, 10:26 AM

I know how to get two from one winding, the problem is getting four from a CT winding.
If it were two windings I wouldn't have a problem. :/

It's really a question of luxury because I have a couple of transformers lying around that would fit the bill.
Besides being costly transformers tend to take up space and I'm considering building a small test circuit on a single 100x160m circuit board just to compare with another one that I built a while ago.

Alastair E · 23rd August 2011, 11:12 AM

Nah, You cant even share the same supplies to both channels!

Tried that, didnt work!

markusA · 23rd August 2011, 11:17 AM

ok, thanks.
I had a feeling it wasn't a good idea but I wanted to be sure.

Alastair E · 23rd August 2011, 06:52 PM

My alternative was a stonking great toroid I got cheap in a clearance at Maplins, to which I added four coils of 200 turns of 0.45 wire each...

--Took a few hours and some cursing but got there in the end!

The 50V 6.5A original windings were used for heaters, (Only needed to use one 50V secondary and its current draw was a little over 3A) and the added coils gave the circ rails...

This gave me four separate 170V rails for the circlotron O/P stage

Yvesm · 23rd August 2011, 08:57 PM

Look at :

Picasa Web Albums - Serge - Bobineuse pou...

and have fun !

Yves.

23rd August 2011, 11:12 AM	#4
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	Nah, You cant even share the same supplies to both channels! Tried that, didnt work! __________________ Das Beste Oder Nichts

23rd August 2011, 06:52 PM	#6
Alastair E diyAudio Member Join Date: Feb 2004 Location: South Wales	My alternative was a stonking great toroid I got cheap in a clearance at Maplins, to which I added four coils of 200 turns of 0.45 wire each... --Took a few hours and some cursing but got there in the end! The 50V 6.5A original windings were used for heaters, (Only needed to use one 50V secondary and its current draw was a little over 3A) and the added coils gave the circ rails... This gave me four separate 170V rails for the circlotron O/P stage __________________ Das Beste Oder Nichts

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23rd August 2011, 10:18 AM	#2
DF96 diyAudio Member Join Date: May 2007	You can't get separate floating supplies from one winding unless you do some very clever things with capacitors. General rule: one winding=one supply (which could be CT), or maybe two supplies sharing a connection.

23rd August 2011, 10:26 AM	#3
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	I know how to get two from one winding, the problem is getting four from a CT winding. If it were two windings I wouldn't have a problem. :/ It's really a question of luxury because I have a couple of transformers lying around that would fit the bill. Besides being costly transformers tend to take up space and I'm considering building a small test circuit on a single 100x160m circuit board just to compare with another one that I built a while ago.

23rd August 2011, 11:17 AM	#5
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	ok, thanks. I had a feeling it wasn't a good idea but I wanted to be sure.

23rd August 2011, 08:57 PM	#7
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	Look at : Picasa Web Albums - Serge - Bobineuse pou... and have fun ! Yves.

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