Symmetric Power Supply

[stephenl]

I just finished building a symmetric power supply. I mostly used parts I had laying around. The transfomer is an Antek AN-5454. It has two 54v secondaries in series and centertapped to ground. The secondaries are 180deg out of phase cancelling, common mode noise, and feed a Corcom filter followed by three duplex outlets. On my 123v line it puts out 112v.

[Colossal]

Steve,

Looks good. What is your application for this project?

[xtian]

Looks cool! But you'll have to tell me what it's for.

[stephenl]

I'm just using it as a power conditioner for my guitar rig.

I have an Adcom power conditioner for my hifi. I plugged my guitar amp into it and noticed that it lowered the noise floor quite a bit, so I decided to build one. This one also has has the advantage of dropping the line voltage down closer to 110vac.

[John_P_WI]

FYI, earth ground needs to be carried through, not shown on KOC's diagram.

[stephenl]

Thanks , John, I caught the missing ground.

Actually, if you wire the Corcom filter the way it is shown,the junction of the two caps from each "phase" to ground is connected to the filter's case ground.

[John_P_WI]

This pic is of a massive 1500 watt medical isolation transformer that I use for the same purpose, note how the yellow / green wire is carried through to the connector block on top.and is also connected to all metal work in a dedicated fashion.



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[stephenl]

Nice work!
I did pretty much the same thing and star connected all the grounds back to a single stud in the chassis.

[Leo_Gnardo]

Looks cool! But you'll have to tell me what it's for.

Handy for running amps & hi fi tube gear that was meant to run on 110V.

I have a couple old GE "piglets" with multiple line voltage taps. They were meant for line voltage correction, taps say 100V to 125V in 5V increments. I drop my house 120 to 110 for the stereo, keeps the 1956 Dynaco MkII amps very happy.

One way to tell, if your 6.3V filaments read 6.3V, not 6.7 or 7.1, then you're where you need to be.

[John_P_WI]

Steve, I can't take credit for the build, it was an orphaned unit I adopted after one of our systems finished regulatory testing, saved it from the scrapper.