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  1. B

    LM317 2N3055 Variable Circuit Problems

    Those Turnigy multi-chargers are not designed to be used like a regular power supply. Very confusing to see just what is connected to what on that breadboard #22 top
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    Microcontroller project for my pool pumps

    A drawing of what you have would be more helpful, even if just pencil on paper.
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    Wire for 12v in-ceiling services

    One thing for sure, if you must jump up and crawl around in the ceiling , follow the new laws and isolate the power at the main switch. In many instances the mains ( if aerials) will still pass through the same space and remain live but at least you will have a better chance of surviving if...
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    The Pursuit of Ground

    Electrical fault currents do not go to ground. They can and do travel in earth conductors. Fault currents return through the neutral via the MEN link. Ground electrode is to keep supply mains voltage from floating above ground.
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    240V ac LED bulb failure

    They don't come in bayonet. hehehehe....think I'd be getting an eye test.....:confused:
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    Wire for 12v in-ceiling services

    If you use the link I provided, it shows only 0.4V drop over 40 feet so ****- all really. Does not matter......rules is rules, Sol, just as oils ain't oils. The big thing is it is in an environment where mains supply lives and breathes. :) For the former, it's probably because there is...
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    The Pursuit of Ground

    In many sensitive electronics or whatever requiring "ground" as in earthing, it is usual to keep any conductors suitably sized and separated from mains supply ground systems and away from large current carrying conductors. Having said that, they do in many instances end up at the same ground...
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    240V ac LED bulb failure

    Debe did say it had to be destroyed to dismantle it ....:oops: As far as floodlights go, this one should more than cover your requirement. (there are others)...check equiv. wattage/type...
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    240V ac LED bulb failure

    When you get a country like Aus with an obsession with workplace health and safety ( to extreme) then as usual, the end user pays. Perhaps why Ebay is so popular down under :)
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    Wire for 12v in-ceiling services

    Cable sizing seems ok. Although awg is not a common reference to wiring here in Aus (except for automotive) there is a quick reference here ...
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    The infamous Panasonic F61 error

    According to that, if the fan working, look for damaged leaking capacitors around speaker output section. The fault circuit looks for any dc in the speaker circuit ....amplifier sections are coupled together using either capacitive or transformer coupling to keep the dc out..... Former is more...
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    240V ac LED bulb failure

    There are many claims about the thousands of hours the new generations of LED lights will last. How they know this is at best I imagine a guestimate. One thing we have found dealing with many differing type of lED fittings for mains connection is that it is invariably the drivers that fail...
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    I need a really small, really smooooth motor...

    Use a small geared motor maybe 3-6v and govern speed / voltage via pwm from a higher voltage supply like 12v. Should give fairly steady speed with your disk attached. Perhaps beef up the thickness of the disk to act more like a flywheel. Plenty of small geared motors on ebay.
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    The infamous Panasonic F61 error

    A good place to start would be find out what F61 error means.
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    Thermistor

    Looks more to me like something has ionised that left hand terminal ...like a short body of the resistor still looks intact.
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    Dodgy Chinese flip flop...or my circuit?

    Sounds like it did not have a series resistor. Good you have working unit and perhaps learned that you need to check everything ( preferably before blow-up) no matter how simple the circuit seems. Can you clarify what you mean about powers the LED both ways around? Something not right there that...
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    The Pursuit of Ground

    In electrical, ground values are obtained using a 4 probe earth tester. In electronics, ground simply means chassis/neg rail and associated shielding.
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    Standard method to prevent over discharge of Li-po 3.7V battries

    Ebay have them. Depending on size, anywhere from $1.50 upwards. Look for battery protection module.
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    Dodgy Chinese flip flop...or my circuit?

    I'd be making sure the LED you say draws 15mA actually does.Put say 180R in series with the LED and measure current with just the LED on the battery.
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    What type of switch is this and how does it work?

    It's a standard run-of- the- mill 2 speed choke. As Bob said, high speed bypass, other two speeds provided from voltage drop in the choke. This type no longer used (again as Bob quoted.)
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