Guessing the dimensions of those wirewounds from the fan (25mm diam, 80mm long - assuming 80mm square fan??), suggests about 25µH and 60µH for them, which represents significant impedance at 20kHz
Finished it, gets a bit hot if 144W put through it tho. I will when I get time drill a 50mm hole both sides, metal grid one side and fan the other, albeit they only seem to go upto 70C... Seem to be more choices of 40mm fans... any fan recommendations....
Getting inside a bit cooler would help, my cable is only rated at 80C, and the PETG facia plate starts going soft at 85C....
You can see this is at 100C after 30 minutes
On the good part, I'll never be using it at those wattages....
But as you can see it is just getting hotter. I'll see what blowing air over it does as well,
Getting inside a bit cooler would help, my cable is only rated at 80C, and the PETG facia plate starts going soft at 85C....
You can see this is at 100C after 30 minutes
On the good part, I'll never be using it at those wattages....
But as you can see it is just getting hotter. I'll see what blowing air over it does as well,
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Well it looks like the 40mmx40mm fans are the way to go, many more on the market. ARX seem to make high temperature ones with ceramic spindles and bearings. They seem to be tested up to 80C for 500 hours. They also do one that is tested at 120C for 500 hours. (ball bearting)
Just having a fan blowing over the heatsink seems to make a massive difference.
somone may find stuff below useful...
RS Components seem to stock these in the UK
120C fan: RS Stock No.: 893-7874 Mfr. Part No.: FD1240-D0042M2AL Brand: ARX (£34.50
)
ARX, 12 V dc, DC Axial Fan, 40 x 40 x 28mm, 28.30m³/h, 3.72W (41dB)
https://docs.rs-online.com/0fd2/0900766b8143c17a.pdf
80C fans, RS do a few, this is quietest at £19.68
ARX, 12 V dc, DC Axial Fan, 40 x 40 x 20mm, 21.6m³/h, 2.04W (33db)
RS Stock No.: 492-4332 Mfr. Part No.: FD1240-C0151D2AL Brand: ARX
but best value at £11.57 is
ARX, 12 V dc, DC Axial Fan, 40 x 40 x 20mm, 21m³/h, 3W (41.5dB)
RS Stock No.: 787-8920 Mfr. Part No.: FD1240-A0241D0AL Brand: ARX
Just having a fan blowing over the heatsink seems to make a massive difference.
somone may find stuff below useful...
RS Components seem to stock these in the UK
120C fan: RS Stock No.: 893-7874 Mfr. Part No.: FD1240-D0042M2AL Brand: ARX (£34.50
)ARX, 12 V dc, DC Axial Fan, 40 x 40 x 28mm, 28.30m³/h, 3.72W (41dB)
https://docs.rs-online.com/0fd2/0900766b8143c17a.pdf
80C fans, RS do a few, this is quietest at £19.68
ARX, 12 V dc, DC Axial Fan, 40 x 40 x 20mm, 21.6m³/h, 2.04W (33db)
RS Stock No.: 492-4332 Mfr. Part No.: FD1240-C0151D2AL Brand: ARX
but best value at £11.57 is
ARX, 12 V dc, DC Axial Fan, 40 x 40 x 20mm, 21m³/h, 3W (41.5dB)
RS Stock No.: 787-8920 Mfr. Part No.: FD1240-A0241D0AL Brand: ARX
