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Old 23rd August 2011, 09:58 AM   #1
markusA is offline markusA  Sweden
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Default CT Trafo and floating psu for circlotron?

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...
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Old 23rd August 2011, 10:18 AM   #2
DF96 is offline DF96  England
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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.
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Old 23rd August 2011, 10:26 AM   #3
markusA is offline markusA  Sweden
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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.
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Old 23rd August 2011, 11:12 AM   #4
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Nah, You cant even share the same supplies to both channels!

Tried that, didnt work!
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Old 23rd August 2011, 11:17 AM   #5
markusA is offline markusA  Sweden
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ok, thanks.
I had a feeling it wasn't a good idea but I wanted to be sure.
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Old 23rd August 2011, 06:52 PM   #6
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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
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Old 23rd August 2011, 08:57 PM   #7
Yvesm is offline Yvesm  France
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Look at :

Picasa Web Albums - Serge - Bobineuse pou...

and have fun !

Yves.
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