Jon Risch twin trans. line conditioner.

Posted by Cleet Torres (A) on August 4, 2014 at 06:07:47

I implemented a home brew mains line filter based on a Jon Risch recipe with two transformer and it is absolutely fab. The trannies are both dual primary and secondary, and I wired then in series which allowed me to ground the “center tap” on transformer # 2 ‘s secondary and get balance power. Cannot be happier.

Now I want to repeat but I want to use three identical transformers. All are dual primaries, dual secondary’s. 110/220 input, 15v secondary (albeit 7.5 or 30(?))

I want to it this way because when I wire in series my VA rating drops to 50%; hence one amp wired in parallel will handle the same amount of current as two identical ones wired in series. Waste not right?

I’ll use the one transformer as the input, which I will wire in parallel as specified for 110v mains. THEN, I want to use wire both trans#2 and trans#3 in series and connect both of their psecondaries (making their secondaries primaries) to the secondary of the first. That way I can “center tap” the outputs of both trans #2 and #3 and get balanced power out of both.

So it’s looks like this :

115v parallel input Trans#1, parallel out 15v -> series input Trans#2, series out 115v
-------------------------------------------------------> series input Trans#3, series out 115v

Now in layman’s theory it should work fine. I am wondering however if the three transformers may start some shenanigans if they are wired together? Do I need to isolate the two secondary transformers from one another?

I’m planning to use a 5 watt 270ohm resistor and about 10uF capacitance across the secondary’s of the first trans. In the two transformer model this is working well for me.

Am I blowing smoke or will this arrangement hold up?

Thanks
Cleet

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Topic - Jon Risch twin trans. line conditioner. - Cleet Torres 06:07:47 08/04/14 (3)

Potential Danger - Jon Risch 21:08:19 08/05/14 (2)

Bummer - Cleet Torres 06:49:35 08/07/14 (0)

RE: Potential Danger - MikeWI 07:29:44 08/06/14 (0)

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