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Quote from: Cerebus on June 24, 2021, 11:48:59 amQuote from: AVGresponding on June 24, 2021, 11:34:37 amWithout knowing more details it's pure speculation really.One thing I would mention that most people seem not to know is that the primary purpose of fuses and circuit breakers is to prevent the supply wiring from heating to the point it catches fire in the event of a short.So called fast semiconductor fuses often included to "save" expensive semis like big IGBT packs etc rarely seem to work that way; maybe that's just poor design, but back when I was mending such things a blown fuse usually indicated a blown semi-pack...It's generally taken that protecting fuses with semiconductors (sic) is a sign of naïvety in the designer of anything so constructed.I contend that it's equally naive to expect fuses to protect any sand state device or component.The 500ma fuse I installed in the Type 547 was to give a vacuum tube circuit a fighting chance in case of a short.
Quote from: AVGresponding on June 24, 2021, 11:34:37 amWithout knowing more details it's pure speculation really.One thing I would mention that most people seem not to know is that the primary purpose of fuses and circuit breakers is to prevent the supply wiring from heating to the point it catches fire in the event of a short.So called fast semiconductor fuses often included to "save" expensive semis like big IGBT packs etc rarely seem to work that way; maybe that's just poor design, but back when I was mending such things a blown fuse usually indicated a blown semi-pack...It's generally taken that protecting fuses with semiconductors (sic) is a sign of naïvety in the designer of anything so constructed.
Without knowing more details it's pure speculation really.One thing I would mention that most people seem not to know is that the primary purpose of fuses and circuit breakers is to prevent the supply wiring from heating to the point it catches fire in the event of a short.So called fast semiconductor fuses often included to "save" expensive semis like big IGBT packs etc rarely seem to work that way; maybe that's just poor design, but back when I was mending such things a blown fuse usually indicated a blown semi-pack...
Quote from: med6753 on June 24, 2021, 11:58:26 amQuote from: Cerebus on June 24, 2021, 11:48:59 amQuote from: AVGresponding on June 24, 2021, 11:34:37 amWithout knowing more details it's pure speculation really.One thing I would mention that most people seem not to know is that the primary purpose of fuses and circuit breakers is to prevent the supply wiring from heating to the point it catches fire in the event of a short.So called fast semiconductor fuses often included to "save" expensive semis like big IGBT packs etc rarely seem to work that way; maybe that's just poor design, but back when I was mending such things a blown fuse usually indicated a blown semi-pack...It's generally taken that protecting fuses with semiconductors (sic) is a sign of naïvety in the designer of anything so constructed.I contend that it's equally naive to expect fuses to protect any sand state device or component.The 500ma fuse I installed in the Type 547 was to give a vacuum tube circuit a fighting chance in case of a short. [We need a emoticon of the sound of something going whoosh over someone's head]You've just restated what I said, but in a less wry and witty way. The whole point of my remark was that trying to protect a semiconductor by putting a fuse in front of it just ends up with the semiconductor protecting the fuse. Even had the "sic" as a huge signpost that I literally meant what I said and that it wasn't a mis-phrasing.
Quote from: tautech on June 24, 2021, 01:21:03 pmMom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML
Mom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML
Quote from: mnementh on June 24, 2021, 01:06:22 amYeah... the difference there is the difference in price. That one costs 4X as much as this little one. You can spend all sorts of money, depending on the features you want. I just got it because cheap as chips, and I'm already familiar with the kind of work they're talking aboot with my ESCs and PDBs.If I let the magic smoke out, well... lesson learnt cheaply enuf. mnem probably not 4x. I paid 20$ shipped. I'm still waiting for it though
Yeah... the difference there is the difference in price. That one costs 4X as much as this little one. You can spend all sorts of money, depending on the features you want. I just got it because cheap as chips, and I'm already familiar with the kind of work they're talking aboot with my ESCs and PDBs.If I let the magic smoke out, well... lesson learnt cheaply enuf. mnem
Quote from: Robert763 on June 24, 2021, 08:34:44 amQuote from: Kosmic on June 24, 2021, 12:11:30 am<SNIP>I ordered something awfully similar. I'm planning to use it to make Type K thermocouple. I should also try to find some nickel strips to see how well it's working on batteries.Edit: I did my homework before ordering and got the "Wise Maple" version that doesn't need to be fixed and should be working out of the box.If welding thermocouples you need a carbon electrode. Using the copper or brass ones suppled with battery tab welders contaminates the alloy and can lead to inaccuracy.I'm still not sure of the setup I'm going to use (will need to experiment a little bit), but was planning to use Nickel plated probes. If the plating is tick enough, I guess it will survive the process.
Quote from: Kosmic on June 24, 2021, 12:11:30 am<SNIP>I ordered something awfully similar. I'm planning to use it to make Type K thermocouple. I should also try to find some nickel strips to see how well it's working on batteries.Edit: I did my homework before ordering and got the "Wise Maple" version that doesn't need to be fixed and should be working out of the box.If welding thermocouples you need a carbon electrode. Using the copper or brass ones suppled with battery tab welders contaminates the alloy and can lead to inaccuracy.
<SNIP>I ordered something awfully similar. I'm planning to use it to make Type K thermocouple. I should also try to find some nickel strips to see how well it's working on batteries.Edit: I did my homework before ordering and got the "Wise Maple" version that doesn't need to be fixed and should be working out of the box.
Quote from: med6753 on June 24, 2021, 02:02:54 pmQuote from: tautech on June 24, 2021, 01:21:03 pmMom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML Tell me about it !Trouble is our main 11 GHz data backhaul link is suffering if we have a run of bad weather or heavily overcast days and especially as the #'s of customers hanging off it grows and batteries are now struggling with the increased load despite there's a 3 full size solar panel array charging them so we need add some wind charging until we can reassign the backhaul load to other yet to be commissioned fiber links. Such are the headaches of a small but successful wireless data provider. A smaller adjacent relay installation crashed last week but an urgent installation of a 2nd solar panel fixed that after a few days of getting the batteries up to full charge again. Check out the charge rate !
Quote from: Cerebus on June 24, 2021, 02:08:55 pmQuote from: med6753 on June 24, 2021, 11:58:26 amQuote from: Cerebus on June 24, 2021, 11:48:59 amQuote from: AVGresponding on June 24, 2021, 11:34:37 amWithout knowing more details it's pure speculation really.One thing I would mention that most people seem not to know is that the primary purpose of fuses and circuit breakers is to prevent the supply wiring from heating to the point it catches fire in the event of a short.So called fast semiconductor fuses often included to "save" expensive semis like big IGBT packs etc rarely seem to work that way; maybe that's just poor design, but back when I was mending such things a blown fuse usually indicated a blown semi-pack...It's generally taken that protecting fuses with semiconductors (sic) is a sign of naïvety in the designer of anything so constructed.I contend that it's equally naive to expect fuses to protect any sand state device or component.The 500ma fuse I installed in the Type 547 was to give a vacuum tube circuit a fighting chance in case of a short. [We need a emoticon of the sound of something going whoosh over someone's head]You've just restated what I said, but in a less wry and witty way. The whole point of my remark was that trying to protect a semiconductor by putting a fuse in front of it just ends up with the semiconductor protecting the fuse. Even had the "sic" as a huge signpost that I literally meant what I said and that it wasn't a mis-phrasing.Well excuse me if I'm not as witty as you are and the whoosh over my head was lack of morning caffeine. Fucking engineers.
That is hefty charge rate. No wonder the arrays can't keep up if you have bad weather.
Quote from: Kosmic on June 24, 2021, 02:05:08 amQuote from: mnementh on June 24, 2021, 01:06:22 amYeah... the difference there is the difference in price. That one costs 4X as much as this little one. You can spend all sorts of money, depending on the features you want. I just got it because cheap as chips, and I'm already familiar with the kind of work they're talking aboot with my ESCs and PDBs.If I let the magic smoke out, well... lesson learnt cheaply enuf. mnem probably not 4x. I paid 20$ shipped. I'm still waiting for it though 54 dollah... Next item in the list on Bang-em-good. Evidently the word has gotten out. mnem
Quote from: med6753 on June 24, 2021, 02:02:54 pmQuote from: tautech on June 24, 2021, 01:21:03 pmMom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............https://youtu.be/gBsDqGanGKA8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML Tell me about it ! Trouble is our main 11 GHz data backhaul link is suffering if we have a run of bad weather or heavily overcast days and especially as the #'s of customers hanging off it grows and batteries are now struggling with the increased load despite there's a 3 full size solar panel array charging them so we need add some wind charging until we can reassign the backhaul load to other yet to be commissioned fiber links. Such are the headaches of a small but successful wireless data provider. A smaller adjacent relay installation crashed last week but an urgent installation of a 2nd solar panel fixed that after a few days of getting the batteries up to full charge again. Check out the charge rate !
Quote from: tautech on June 24, 2021, 01:21:03 pmMom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............https://youtu.be/gBsDqGanGKA8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML
Mom & Pop ISP we work closely with has a new project for me. Please make a mount to affix it to a pole (done and shit easy) and assemble this vertical helix 200W 24V wind alternator......instructions are crap, real crap and the B&W illustration show bugger all detail of how the 6 tiers of blades are actually fastened so went looking for assembly videos............https://youtu.be/gBsDqGanGKA8 yes 8 sequential videos how to assemble the forking thing where at a few stages it appears extra sets of hands are needed ! FML
Quote from: Kosmic on June 24, 2021, 02:06:56 pmQuote from: Robert763 on June 24, 2021, 08:34:44 amQuote from: Kosmic on June 24, 2021, 12:11:30 am<SNIP>I ordered something awfully similar. I'm planning to use it to make Type K thermocouple. I should also try to find some nickel strips to see how well it's working on batteries.Edit: I did my homework before ordering and got the "Wise Maple" version that doesn't need to be fixed and should be working out of the box.If welding thermocouples you need a carbon electrode. Using the copper or brass ones suppled with battery tab welders contaminates the alloy and can lead to inaccuracy.I'm still not sure of the setup I'm going to use (will need to experiment a little bit), but was planning to use Nickel plated probes. If the plating is tick enough, I guess it will survive the process.for alloy thermocouples any metal, even one that is part of the couple metalurgy could upset the accuracy due changing the alloy ratio. For couples with pure element metals you can use one of them but it's still normal to use carbon as the second electrode with the two couple wires connected together. The wires should be positive when welding. Ideally they should also be shielded with Argon (small disposible bottles are available for hobby MIG welders).Some fine wire type K thermocouples are welded wire to wire without another electrode.
3) If problems with the outside world persist, try whiskey instead.
Quote from: mnementh on June 24, 2021, 02:53:33 pmQuote from: Kosmic on June 24, 2021, 02:05:08 amQuote from: mnementh on June 24, 2021, 01:06:22 amYeah... the difference there is the difference in price. That one costs 4X as much as this little one. You can spend all sorts of money, depending on the features you want. I just got it because cheap as chips, and I'm already familiar with the kind of work they're talking aboot with my ESCs and PDBs.If I let the magic smoke out, well... lesson learnt cheaply enuf. mnem probably not 4x. I paid 20$ shipped. I'm still waiting for it though 54 dollah... Next item in the list on Bang-em-good. Evidently the word has gotten out. You can find cheaper on Ali flea market express. YougetBangedVeryGood is always a bit more expensive.
Quote from: Kosmic on June 24, 2021, 02:05:08 amQuote from: mnementh on June 24, 2021, 01:06:22 amYeah... the difference there is the difference in price. That one costs 4X as much as this little one. You can spend all sorts of money, depending on the features you want. I just got it because cheap as chips, and I'm already familiar with the kind of work they're talking aboot with my ESCs and PDBs.If I let the magic smoke out, well... lesson learnt cheaply enuf. mnem probably not 4x. I paid 20$ shipped. I'm still waiting for it though 54 dollah... Next item in the list on Bang-em-good. Evidently the word has gotten out.
philosophical argument: fuses exist to be replaced!
Quote from: bd139 on June 24, 2021, 02:15:44 pmphilosophical argument: fuses exist to be replaced!Functionally, by the silicon they're in series with.
One of my saved sellers seems to have acquired a large SK lot, it's in the US unfortunately:https://www.ebay.co.uk/usr/the*treasure*trove*
It's not easy to post from my shitty J6 but here's a few:https://www.ebay.co.uk/itm/HP-3582A-Spectrum-Analyzer-/294239298862https://www.ebay.co.uk/itm/HP-5334A-Frequency-Counter-Hewlett-Packard-/114859062183https://www.ebay.co.uk/itm/Lloyd-Instruments-MPM-1015-Three-Phase-Inverter-/373624969047https://www.ebay.co.uk/itm/HP-Hewlett-Packard-54520A-500-MHz-Digital-Oscilloscope-1GS-s-500MSa-s-/274835321193https://www.ebay.co.uk/itm/TEKTRONIX-2440-500MS-S-DIGITAL-OSCILLOSCOPE-/324689570363https://www.ebay.co.uk/itm/Hewlett-Packard-HP-11C-Programmable-Scientific-Calculator-with-Manual-/284341718967One of my saved sellers seems to have acquired a large SK lot, it's in the US unfortunately:[url=https://ebay.co.uk/usr/the]https://ebay.co.uk/usr/the*treasure*trove*[/url][/b][/color]
Thank you for that. 54520a added to watch list