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    Lithium-ion batteries safe to play with?

    Yeah, but the likely variations (nice, safe, environmentally-friendly) all mean essentially the same thing in that context. The take-home message though is that I can't do anything with my old lithium-ion batteries. Shame to waste them :(
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    Lithium-ion batteries safe to play with?

    I have a couple of lithium-ion batteries from a broken smartphone. Can I use them for a project or are they too dangerous for a novice to play around with? I made a bike light that charges NiCad batteries using a dynamo with the batteries maintaining the light while stopped. I think I was...
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    Advice on purchasing a cheap bench power supply

    Thanks a lot for your advice. Do you think something like this would be good? http://www.ebay.co.uk/itm/Manson-EP-613-Benchtop-power-supply-/141045984740?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item20d6feede4
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    Advice on purchasing a cheap bench power supply

    I live in the UK. I bought a really cheap power supply from a Chinese EBay seller and it broke pretty quickly. I'm now looking for another but I'm willing to spend a bit more; ideally less than £130, if that's possible. I've got quite a few hobbies of which basic electronics is one. I don't know...
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    Broken toaster

    My toaster broke and I'd like to see if I can fix it rather than replace it. I think it happened when I pulled the lever up manually to abort the toasting operation prematurely as is my custom. I saw a bright orange light under the toaster and at the point the lever would no longer stay in the...
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    Cheap variable power supply circuit stopped working

    I bought the below variable voltage power supply from eBay last year. It worked fine when it arrived. I left it alone for a while and it seems to have stopped working, The component with 330 printed on it appears to be overheating. Turning the potentiometers does not seem to affect the...
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    Problem with Heathkit IO-102 oscilloscope - vertical deflection doesn't change

    I used the collector leg of D1 as ground, based on the schematic. With the vertical dial set to GND, Q1 voltages as follows: G: 0 D: 9.91 S: 0.02 With the vertical dial set to x1 and a 3.58 V potential applied to IN and GND vertical inputs, Q1 voltages as follows: G: 2.25 D: 9.71 S...
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    Problem with Heathkit IO-102 oscilloscope - vertical deflection doesn't change

    Hi Kris, I was at home for a few weeks and unable to test my oscilloscope. Now I'm back and have it behind me. The leads on Q1 and Q3 appear to be darker in colour than the similar components around them - they're a sort of bronze compared to the silver of the others. I would have measured the...
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    Dehumidifier not working - suspect fault in fan motor; easy fix?

    Hi. I want to connect my new thermal fuse but I don't know how. I can't solder it because that will probably blow or at least damage the fuse, even with heat sinking. I'm not sure crimping will work because I need to connect the insulated wire of the stator coil to a leg of the thermal fuse. The...
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    Problem with Heathkit IO-102 oscilloscope - vertical deflection doesn't change

    I have a Heathkit IO-102 oscilloscope - a modern marvel of electronic engineering! However my particular scope has a problem. It may have been caused by me applying a voltage that was too high for the settings (don't know whether they're susceptible to that) whilst I was figuring out how to use...
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    Dehumidifier not working - suspect fault in fan motor; easy fix?

    I missed this message. I had a feel along the wire close to that point, and shrouded in heat-shrink was a small piece which was much harder than the rest. I uncovered it and found what appears to be a thermal fuse. I will need to confirm that it's blown (no multimeter to hand but maybe I can...
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    Dehumidifier not working - suspect fault in fan motor; easy fix?

    The fan turns very easily, so I don't think it's seized up. I've looked, and unravelled some of the yellow tape which wraps a coil whose function I can't determine. I can't see any thermal fuse in there but maybe it's somewhere else that I can't see. I don't understand why it uses a motor...
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    Dehumidifier not working - suspect fault in fan motor; easy fix?

    My grandmother's dehumidifier isn't working. It sounds to me as though the refrigeration system is still working normally, but the fan doesn't rotate. I took a photo of the motor. I don't have my multimeter available, though I suppose I could get one. The motor looks very strange. I don't know...
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