Scheming a little F5 build in this chassis as pictured.... while I think I will technicaly/literally be able to fit everyhing, any notable issues with such a snug fit?
Trafo is AS3218 for reference, shielded Antek.
Thank you
Trafo is AS3218 for reference, shielded Antek.
Thank you
Snug is OK. If you are having problems fitting a board, the almost-in-the-store F5m
has a power supply board measuring 4.55" front to back and 5.45" side to side that
might be a fit.
has a power supply board measuring 4.55" front to back and 5.45" side to side that
might be a fit.
On a project I ended up using a longer main bolt, and bolted a metal plate above the transformer. This was actually an old 3.5" HDD cover,
I added a long standoff to stop the plate spinning. This then provided a nice secure platform to bold the PCB with the rectifier and main caps to.
So dependent on the total height, that may be an option too.
I added a long standoff to stop the plate spinning. This then provided a nice secure platform to bold the PCB with the rectifier and main caps to.
So dependent on the total height, that may be an option too.
Thank you for the replies - I think it'll just fit and the boards are slim enough they wont interfere. I will check with the IEC inlet as well. I cant mount the trafo vertically, i dont have the height for it.
Anyways, as long as theres no other objection, we will make it fit!
Anyways, as long as theres no other objection, we will make it fit!
You may have created a shorted turn. Do you have a picture or sketch of the transformer, platform, and long standoff?
^ I was thinking the same thing.
A shorted turn (360 degree electric connection) would cause overheating of the transformer when power is on.
A shorted turn (360 degree electric connection) would cause overheating of the transformer when power is on.
it's simple, just avoid these things
in short- tip of xformer screw must be electrically isolated from anything/everything
now, mounting something on top of xformer bolt is convenient, just avoid electrical connection
in short- tip of xformer screw must be electrically isolated from anything/everything
now, mounting something on top of xformer bolt is convenient, just avoid electrical connection
Good point about the shorted turn, thanks guys!
I actually didn't have a single standoff of the right length, and so used one metal and one plastic, with a 3mm screw with the head cut off, to join them together: but that's just chance as I didn't think about the shorted turn issue 😀
So it is insulated, but only by happy coincidence - but I'll remember the idea and know to purposefully make sure it's open circuit if I reuse the trick 😀
Of course there's another related, subtle issue - the actual platform will be 'humming' at half a turn, so I won't use any chassis ground up there as it won't be very good 😀
Maybe I'll just isolate it, might be easier in case I forget later!
I actually didn't have a single standoff of the right length, and so used one metal and one plastic, with a 3mm screw with the head cut off, to join them together: but that's just chance as I didn't think about the shorted turn issue 😀
So it is insulated, but only by happy coincidence - but I'll remember the idea and know to purposefully make sure it's open circuit if I reuse the trick 😀
Of course there's another related, subtle issue - the actual platform will be 'humming' at half a turn, so I won't use any chassis ground up there as it won't be very good 😀
Maybe I'll just isolate it, might be easier in case I forget later!
In my F6 I built a riser under the transformer that houses my primary wiring and CL60s. I had to get creative with some aluminum plate to make it all fit, but as you can see in the second picture it all fit. No noise issues either. I did have to make some custom tools to adjust the trimmers with the heat sinks in place. I was able to get the bias and offset pretty close with the sinks out of the enclosure. They needed small tweaks when the enclosure was all together and cooked up to temp. I left all the wiring long enough to lay the heatsinks down next to the center of the enclosure without disconnecting anything.
If you haven’t already purchased the parts, you might want to consider higher temp-rated Capacitors? (This chassis looks a bit like an oven, but on the other hand, I am maybe a bit over-cautious)
I’m new to building SS gear but have a plan for one. Is it ok to mount the chips away from the boards? Then run the wires to the boards?
I like the 'put the space underneath' approach, it's a very neat idea.
I measured my plastic spacer, 0.42 Vac across that, and then I measured the top plate (bolted to the toroid bolt), to the base metal of the amp, and that was 0.24 Vac, which figures, it's slightly more than half a turn. Doh!
Even if I isolate it or use plastic any wire going up there will naturally form a partial turn, so perhaps I'll also look at raising my transformer up on a 'top-hat' bit of steel, and then my filter PCB etc will be nicely at the 0V level: voltage which around the transformer appears to be measured in inches 😀
I measured my plastic spacer, 0.42 Vac across that, and then I measured the top plate (bolted to the toroid bolt), to the base metal of the amp, and that was 0.24 Vac, which figures, it's slightly more than half a turn. Doh!
Even if I isolate it or use plastic any wire going up there will naturally form a partial turn, so perhaps I'll also look at raising my transformer up on a 'top-hat' bit of steel, and then my filter PCB etc will be nicely at the 0V level: voltage which around the transformer appears to be measured in inches 😀
When I was messing around with my f6, I was afraid of the IEC wiring being too cramped. I borrowed the idea from another member, to elevate the power supply board. It’s not quite as nice as @No 4 solution.
https://www.diyaudio.com/community/threads/aleph-j-build-guide-for-noobs.357002/post-7419171
https://www.diyaudio.com/community/threads/aleph-j-build-guide-for-noobs.357002/post-7419171
