No, that is why the preferred capacitor configuration shares 4 caps per rail in the first stage between channels and splits into 2 caps per rail in the second stage of the CRC filter.
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Something I had not considered before. How about stacking 2 toroidial transformers with 1/2 of VA rating of the single transformer? The vertical height would be about 6.2", the diameter decreases, and the Antek price is about the same. Now you have 4 secondary windings and can really have independent power supplies for the 2 channels.
The cap board below would do just fine.
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That would also be my preferred configuration, because I already have suitable toroids with enclosures. It would also allow me a few more mounting configurations. I was going to use this build as an <cough> "excuse" to purchase a shiny new 1000 VA Toroidy I've had my eyes on. I may still go that route. Either way, If you do choose to offer options, I would order both. It will open up some possibilities.
Even though it's for a different amp I stacked mine. Allows for everything in a single enclosure.
Regards,
Dan
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Should be! It weighs about 40lbs! It's a 1.6kva CLC 60VDC power supply for the Schade amplifier mentioned in this forum.
Regards,
Dan
I word of warning: I have not been able to confirm the accuracy of the thermal resistance quoted for the Store 5U 400mm heatsinks. If anyone out there has a build using them, can you provide the following information:
- heatsink depth (300mm, 400mm, ..)
- heatsink height (210mm for all of them?)
- watts dissipated per heatsink
- temperature rise: T_sink-T_ambient)
I can confirm the dimensions. See attached. Note that there are two heatsinks per side. So, heatsink depth on the 400mm is 2 x 200mm. See pics. Apologies for poor lighting.
Note, the specs for each sink is 0.28C/W. Note my dodoness, in that I don't know if you just cut that in half for two sinks... but wanted to be sure to clarify. Here is the page.
40mm Heatsink Information – diyAudio Store
200 x 40 x 210 0.28C/W
I did a quick Google search, but I am unable to determine how I could measure the last two points. I've read a few posts that state that we should generally "de-rate" them by 25%. However, I truly don't know. If you have a simple way to measure, I'd be willing to give it a go.
Note, the specs for each sink is 0.28C/W. Note my dodoness, in that I don't know if you just cut that in half for two sinks... but wanted to be sure to clarify. Here is the page.
40mm Heatsink Information – diyAudio Store
200 x 40 x 210 0.28C/W
I did a quick Google search, but I am unable to determine how I could measure the last two points. I've read a few posts that state that we should generally "de-rate" them by 25%. However, I truly don't know. If you have a simple way to measure, I'd be willing to give it a go.
Plasnu - That makes sense.
Ihquam - Thinking about it a bit more... (That's dangerous for me)... I can very easily take the following measurements and provide information about set-up for the amp in the chassis.
Ihquam - Thinking about it a bit more... (That's dangerous for me)... I can very easily take the following measurements and provide information about set-up for the amp in the chassis.
- Bias current and rail voltage => W per device
- Number of devices per heatsink x W per device => Total W per heatsink dissipated
- Temp of devices on package
- Temp of external surface on heatsink at hottest spot
- Ambient temp
I think Lynn is asking if the C/W is accurate in real life. Looking at the dimensions of the heat sink vs. the claimed C/W, the C/W looks to be optimistic.
Has anyone used this chassis, 5U, and can verify the watts strapped on the heat sink vs. the heat sink delta temperature?
For example a F5 Turbo at 40 volt rails and 2.25 amps = 180 watts per side. This would result in a 25C rise in temperature if the .14 C/W is correct. Can anyone verify that the store heat sinks can support 180 watts per channel and only have a 25 C temperature rise?
Rush
@Rush, I know exactly what you mean. I bought similar sized heatsinks hoping they work for my amp, but they did not perform as good as this chart. That's why I guessed their chart includes dissipation from the other part of chassis. Maybe serrated fins helps, which suppose to dissipate a little better than flat fins. I don't know how better, though... Let's wait the report from real users.
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Plasnu - That makes sense.
Ihquam - Thinking about it a bit more... (That's dangerous for me)... I can very easily take the following measurements and provide information about set-up for the amp in the chassis.
Would that help?
- Bias current and rail voltage => W per device
- Number of devices per heatsink x W per device => Total W per heatsink dissipated
- Temp of devices on package
- Temp of external surface on heatsink at hottest spot
- Ambient temp
Yes, that is exactly what I am looking for. And the measurements of heatsink temperature at the hotspots and near the edges too.