| Electronics > Projects, Designs, and Technical Stuff |
| Why isn't there many soldering station that uses a switch-mode converter? |
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| technix:
--- Quote from: Benta on December 18, 2018, 03:33:09 pm --- --- Quote from: coppercone2 on December 18, 2018, 01:29:22 pm ---you can add a steel plate to it to weigh it down, or you use a nice steel chassis. --- End quote --- Of course you can. But as a transformer is so cheap anyway, why bother? It's just more complication., --- End quote --- Once again, standard external SMPS bricks costs about as much as transformers here in China, and I do need some kind of heat sinking for the power MOSFETs so a metal chassis is actually preferred. |
| David Hess:
--- Quote from: ataradov on December 18, 2018, 06:33:16 am ---Size and cost are also factors here. Big transformers are expensive. --- End quote --- Size and weight are actually an advantage for something sitting on a desk which you do not want to knock around and a transformer is more reliable than a switching regulator except when it is operated at twice its rated voltage which is hardly a common problem. Number of switching regulators I have had fail: countless, I could fill a trash can with them. Number of transformers I have had fail: one doorbell transformer 20 years ago. If you are buying custom transformers in the quantify Weller does, then the cost is much lower. |
| LapTop006:
--- Quote from: Nusa on December 18, 2018, 06:29:05 am ---Dave is something of a special case. Most of us don't have to worry much about having ~120V hardware lying around to accidentally plug into ~240V power. Especially those of us that live in ~120V areas, as the reverse case isn't very dramatic. --- End quote --- It's more common than you might think, I work with a bunch of deployment engineers who are always travelling to various datacenters, even in 110v parts of the world it's not uncommon to only have >200v power easily available (sometimes 208, but usually 220-250v). |
| coppercone2:
I am pretty sure the art of electronics or some other book had a nice circuit for protecting transformers from this. |
| Nusa:
--- Quote from: LapTop006 on December 19, 2018, 12:25:18 pm --- --- Quote from: Nusa on December 18, 2018, 06:29:05 am ---Dave is something of a special case. Most of us don't have to worry much about having ~120V hardware lying around to accidentally plug into ~240V power. Especially those of us that live in ~120V areas, as the reverse case isn't very dramatic. --- End quote --- It's more common than you might think, I work with a bunch of deployment engineers who are always travelling to various datacenters, even in 110v parts of the world it's not uncommon to only have >200v power easily available (sometimes 208, but usually 220-250v). --- End quote --- Well, speaking as one of those in the 120V world, I've got 240V available. But I don't have a single US 240V plug to C13 connector cord. Not a single one. One underlying problem is that the C13/C14 connector standard is used for multiple voltages internationally. If the unit had had a hard-wired cord (which, ironically, would make it cheaper to manufacture), this accident never would have happened. |
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