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    need basic schematic for a 12v gradual power up for small water pump

    The link you supplied says the unit is only suitable for diesel fuel, hence I would say the sheering of the impeller. Wattage output is , according to the link, 175W so you are way out on the estimated current draw. (more like 15 to 20A) You could try one of the pwm speed controllers off Ebay...
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    ETI magazine Feb 1979 - power supply (ETI-142)

    Steve, I found this but it does not list any CB power supply. Hope it's the right mob. Cheers ...Jorgo http://www.americanradiohistory.com/ETI_Magazine.htm :):) I'm guessing you'll grab them anyway.
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    Conundrum using resistors? (Raw rookie)

    Op said" a resistor and 4 leds" so the value of "a resistor" would be incorrect for 20ma requirement.
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    Conundrum using resistors? (Raw rookie)

    Where is your 5v coming from? Show a circuit. Am I correct in assuming you are reading the output without leds connected?
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    Low-ESR 1uF electrolytic (hard to find)

    Did you add the red markings referring to "tantalum"? Otherwise I would have read the drawing as standard electrolytics.
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    help wiring 3 phase washing machine motor

    More than likely the voltage level generated by the controller, not necessarily the local supply authority.
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    help wiring 3 phase washing machine motor

    You won't do it by just poking a capacitor in here or there. You will need to retain the main controller and go from there. Details of similar ones hacked on the net. One example here...
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    help wiring 3 phase washing machine motor

    AC motor speed is usually governed by the number of poles and frequency.
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    Just murdered a MOSFET. What did I do wrong?

    May not be relative to the fault, but your 50 vac is not 50v dc as shown, more like 70v dc.
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    How do I test a Battery?

    10watt auto lamp as a load. Should maintain around 12v for 5 hours at least. ( assuming a 7Ah battery which most are)
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    Ceiling Fan Repair

    Is the control set to high speed or a lower setting.? Choke, thyristor or capacitor speed control?
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    Bosch Cordless Drill GSR 12-2 Charger testing

    As I said, depends where you are I guess. Here is a 12v Makita, charger, battery and case for $99.00 with a 3 year warranty. Battery is $40 alone. Guess it's an individual thing to determine what is good value and what is not. To be fair though, it is an el-cheapo Makita from China. Ok for...
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    Bosch Cordless Drill GSR 12-2 Charger testing

    Don't know what it's like over your way but here it is hardly worth the effort. New drill with charger and usually 2 batteries in a case (Makita or similar) can be bought for near the price of 2 replacement batteries alone. Repacks are generally rubbish. My Dad used to salvage my older drills...
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    Magnifying lens help needed pls.

    I use these...quick and easy.....cheap too ....:) http://www.ebay.com.au/itm/5X-10X-Monocular-Magnifying-Glass-Loupe-Lens-Jeweler-Tool-Eye-Magnifier-New-/122361466355?var=&epid=572213249&hash=item1c7d4fcdf3:m:mV0tsi6ITCb2LFEtCJkAcxA Actually used it today ...found a self-inflicted fault in a...
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    Building a New Fish Tank Stand

    Any switched outlets should be double pole if running from an outlet via a plug. This ensures the active is switched for safety reasons. Problem then is that these cost apprpx 10 times that of a normal outlet. Get it wrong and the shock to follow will certainly wake you up from the boredom.
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    Arduino Uno Project Help

    I had a look on youtube and under the actual video is a list ( more that you supplied here) of all the parts used including the code. One would think the Op would have taken the time to sketch out a circuit diagram but it seems the response to additional info is "don't have the time". Perhaps he...
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    Bosch Cordless Drill GSR 12-2 Charger testing

    Normally there is some type of charge indicator LED. Then again if the battery is toast then the indicator will never light up. These chargers usually have a couple of protection devices and can get complicated to trace just exactly how they operate. If your battery is around 5 years old I'd be...
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    Help finding a switch

    I think you will find the practice of running an led off a coil cell without a resistor is more to do with the cell internal resistance and ability to only provide the small current. Installation of the coil cell on a ring will be rather ratty though even with a miniature switch.
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    Help identifying a display

    Could be one of the new type oled displays.
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    Got anything new?

    If I follow your meaning correctly, I built a similar unit a few years back. Not using a stepper but a geared up mini servo driven by an 08m picaxe. Unit is a tacho with a signal originally meant to drive an optical unit i.e. 0-5v output. Ended up a nice scale unit for the 1939 era 1/5 Rivierra...
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