I am about to build up the final cases for my Funny^6 and have a question regarding the possible interaction of magnetic fields between my small signal transformers and the main donut. I would like to build monoblocks with a sink on just one side, similar to the ACA. Not real sure if this will work well considering the use of the repeaters in the main circuit. Wanted some opinions about any options that would allow a fairly compact enclosure without transformer funny business happening inside the case. Am I screwed. Is a seperate PSU box my only option?
I've reached the point where everything I build has a separate power supply chassis, I use audio transformers in most of my designs, and coupling is always an issue. The one place where I did not put the supply in a separate box I had a lot of problems getting things sufficiently quiet. (My set up is all tube, and I have very high efficiency speakers)
In the long run if you can accommodate the additional boxes this will be easier to get really quiet.
In the long run if you can accommodate the additional boxes this will be easier to get really quiet.
Someone can correct me if I'm wrong Buzz, but, distance is the biggest variable to control on your side. Put the dognut on one end and the signal stuff on the other end. Of coarse sheilding will be to your advantage also...
New Years wishes to you and family
New Years wishes to you and family
buzz
there is no other way than to try
make quick mock-up with pcbs on heatsinks , without rest of case ( or with but without drilling holes for mains xformer) , position everything as planned and fire it up
there is no other way than to try
make quick mock-up with pcbs on heatsinks , without rest of case ( or with but without drilling holes for mains xformer) , position everything as planned and fire it up
Thanks fellas. Was trying to keep it compact, but doesnt look like it will work. ZM, in the proto stage I had trouble at one point as the bias was jumping around on one side. Turns out that I had the big dount too close to the little guys, so I was already a little worried. I think I will just go the seperate enclosure route. What should I put in PSU box? Toroid only. Been around the bend on this one but still no best practice understood, at least on my part. Happy New Year.
I would put a part of cap banks inside a PSU case. Just from Maxwell equations: less variations in current, less radiations 🙂. Actually everything works out much nicer when you don't have those nasty time derivatives ;-). However, I can miss smth from other points if view 🙂 best Christmas (not fur us yet, ZM 🙂 and NY wishes!
All AC wiring, toroid PT, rectifiers, caps, filter inductors if present, and caps. (CLC) All you need in the amp is local, but stiff decoupling, do all of the filtering in the other box. Make sure to use large gauge conductors in the umbilical - 12awg is not too large at these currents, and make no longer than necessary.
Mentioning chokes, even a few mH with large filter caps is going to knock the ripple down effectively.
Mentioning chokes, even a few mH with large filter caps is going to knock the ripple down effectively.
buzz
you can do stacked cases , with PSU down
steel plates on top pf lower one and on bottom of upper one
PKI - we are lucky ones - enjoying in all Feiertags
you can do stacked cases , with PSU down
steel plates on top pf lower one and on bottom of upper one
PKI - we are lucky ones - enjoying in all Feiertags
The biggest thing is distance between the power and the signal transformers.
After that, you can rotate transformers to minimize coupling.
😎
After that, you can rotate transformers to minimize coupling.
😎
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