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| Off the shelf "tube" needed for dummy load bank |
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| ocset:
Hello, The three pdfs attached depict the “chimney tube” resistive load bank, which here is for 48V,6.5A (312W) It is an el-cheapo load bank, easy and quick to make. We just need to find the tube itself……we’d like it to be metal, but will settle for plastic. Do you know of any off-the-shelf tubing like this? (we can cut the air intakes out ourselves). It can be round or square cross section..or “any-side-oganol” for that matter...approx at least 16 cm long….approx 6cm radius. ..or any length (we can cut it to size) |
| langwadt:
cut four strips of fr4 and solder the corners ... |
| Ian.M:
A couple of food cans with both ends cut out then soldered end to end. It will be strongest if you get ones that have a slightly reduced diameter rim at the bottom so they stack. Beware of ones without a rim at the bottom as you cant cut the bottom out cleanly and safely with an ordinary can opener. The 68R resistor (Load Bank 1.pdf, bottom right) is pointless as it only reduces the total resistance by approx 1.2%, but the MCPRW025JW150B00 15R resistors are 5% tolerance, and if they are from the same batch, their errors may well be correlated. If you do need to trim the total resistance, you'll need to measure the actual resistance as built before calculating the shunt trim resistor value. |
| Nusa:
I don't know UK sizes, but there are bound to be many choices in both metal and plastic among sewer/drain/plumbing/hvac/dryer/other piping that have the right diameter. Other possibilities are terracotta pots, tea or biscuit tins, big-gulp size mugs, or simply riveting some sheet metal in a circle. If you go with cans, instead of cutting the bottom, one could simply poke a lot of vent holes around the base and put the fan (if any) at the top. |
| duak:
Here in Vancouver we have a number of stores that have Chinese and Korean cooking supplies. I recall seeing little stainless steel pots that might be about the size you're looking for. One colleague has a stacking set of small steaming pots that his wife picked up in Thailand. Google "stacking stainless steel steamers" (really) and you should get an idea. I've also had good luck at finding formed metal things like this at the local metal recyclers. Cheers, |
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