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  1. B

    PC power supply fail after power a power outage

    Units such as this usually wait for a pg (power good) signal from the pc.
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    How to get different OUTPUT voltages in ARM micro?

    You already have your answer from #2.
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    Help find this Mabuchi motor pinout

    Mabuchi 18 V High Torque Motor with 16 T Spur Gear and Optical Encoder 3400 RPM Found a similar arrangement....might be enough to trace out your motor...(see pic"2") Cheers...Jorgo
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    Light Intensity Level Switch

    Called a lux meter...been around for many many years.
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    Adding an external 240v garden light

    Call a qualified electrical contractor, best advice you will get.
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    Automatic door

    Up to you. A 12V motor on the same loading requires less current so switching elements can, for the most part, be smaller specs. Gearbox motor essential. As I said before, no need for a micro and no need to control length of time for the motor run. In my experience, a 2 year old would find it...
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    whats the best way to wire 40 SLA batterys in parallel

    Not a good idea. A fault in one leads to the rest dumping massive current into the fault. Not to mention charging difficulties.
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    Automatic door

    Small dc motor with a gearbox ( ebay...cheap) driving a rope around some pulleys, forward and reverse momentry switches, limit switches for each end of travel that automatically select the other direction. So either push and hold forward button, door moves off that limit or use a latching...
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    Hiding a momentary push button.

    I'd say Bob's idea x 2 ... one option there would be to supply ir light and use an ir led, blocking the transfer for switching. One could also consider a hall effect switch but then there is either the need to carry a magnet or/ have the magnet attached to the back of the hall effect and carry...
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    Need high voltage/current DC with adjustable frequency

    The number of times per second that an ignition coil fires depends on how many cylinders. In most things, energy out is equal to energy in minus any losses. Even at 3 amp in on a 12v coil, one could say at even 50% efficiency, one would expect to see 18W out. Don't know how you found 5 watts...
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    Measure spindle speed with a Multimeter???

    Think you will find it requires a changing voltage. A hall effect (A3144), magnet, collector resistor and a battery should work. Take the signal from collector to ground.
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    How does a 110v portable generator with brushes generate electricity?

    Besy way is watch something like this. http://www.vega.org.uk/video/programme/224
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    Resettable overload protector default setting

    By this do you mean the neon was glowing dimly? If so then this is normal. It is not an indication of current but of voltage presence. In some installations, given the nature of the MEN system, some small voltage can be present on the neutral. With the neon being a fairly sensitive device (low...
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    adjustable circuit breaker

    One way is to use a rather large floodlight( maybe 150W) in series with your work. That way if the load becomes excessive it will cause the lamp to glow brightly. Under test the lamp may run dim. Depends really on what the load current of the device under test is.
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    Need high voltage/current DC with adjustable frequency

    Car ignition coil, 12v battery, say 555 timer to give required frequency pulse and drive the coil with a MJ10012 darlington transistor via a bc639 . Will need a base resistor on the MJ10012 of about 40R 5W and a base and collector resistor on the bc639. On the phone presently but will get exact...
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    T3J81 (Zener Diode ?)

    Do you have a model number for this Generac machine??
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    Another "which diode to use" Question

    No idea what the 1K resistors are supposed to do. As far as diodes, one can get 100v diodes 1amp for a couple of cents each. Although the voltage is important, the 100 and 400 v diodes are common. What you need to decide is whether 1amp is sufficient or whether you need to go to 3 amp. These...
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    Sending and receiving data cheap

    I'd say forget about Instructables. It can be very misleading at times. :oops:Edit:- Have to eat my words here as the one I refer to was actually posted in Instructables as well. Link below......:oops: Check the Arduino tutorials and forums on "mesh networking". There is a bloke from down...
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    Panasonic AG-1980 VCR won't play a tape... it just ejects it

    I think you will find that is also driven by the same belt/gearing.
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    Enclosure Grounding, Insulation

    Most importantly.........Depends on the power supply unit. As long as it is an isolated type supply unit then no need for any earth as your case encloses only 12v. (true??) If the circuitry requires shielding in any way then the case should be connected to the negative of the 12v supply. Do...
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