OT:PCB Mounted Power transformers

[JFX09]

Hello to you friendly board

I am about to build a box to replace my dead jupiter-6 transformer. I have gotten hold of two xformer, but they are of the PCB mount type. A tech said I could silicone them to the box but it seems a bit to haywire for my taste. So I want to design a pcb for them. Anything in particular to watch for? I was thinking about the width of trace, should they be wider? AC in kept to a minimum lenght?

It's a 6.3 v and  15V.

Thanks for any pointers,
jf

[brett]

Hi
skinny traces are ok for the AC in, but DC out needs solid traces if handling lots of current.

My rule of thumb is that you need 0.04 inches (1mm) of width per amp of current.  e.g. 2.5 amps = 0.1 inch.  That's more width than you'll see recommended elsewhere on the www, because they don't allow for any imperfections, and they allow a significant temperature rise (e.g. 18 F/10 C).

Also, the idea of mounting them on a bed of silicone isn't silly.  Many transformers physically vibrate (annoyingly), and an absorbent pillow of silicone might prevent some of that being transmitted to the chassis.
cheers

[JFX09]

 thanks a bunch brett, that's exactly what I wanted to know.