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  1. B

    LED strips not lighting up

    Set meter to DC volt range.......any range above 12v (most meters have a 20v range). One end of the black probe goes to Common socket on the meter. One end of the red probe goes to V socket on the meter Connect other end of the red probe to the plus sign on the strip and black probe to the...
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    Connecting a powersource directly to a SLA Battery

    Burglar alarms and such run like this all the time........ they do however have a charge controller in between the power supply and the battery. Assuming (as most power supplies are) the unit puts out slightly more than 12v.
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    Sketch help - 3 axis accelerometer

    Forget the analog device and try to get it to print "hello world " first.
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    3 phase motor as generator. Power output?

    Very rare
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    reducing 5V to 4v or 4.2v MAX

    One or two schottky diode and one silicon diode in series.
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    How to turn off a LED with 3.7v

    Show your circuit diagram.
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    current flow in earthing point problem????

    Not an earth fault as such, rather an insulation resistance less than infinity. Take any magnesium dioxide insulation heat element ( stove or hot water element) ....an acceptable level of insulation resistance here is 0.5 meg ohm. Other examples in appliances is a minimum of 1 meg ohm. I'll...
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    Miniature chandelier wiring

    These appear to be similar to the old "wheat grain bulbs" from way back when.............. More important to limit the voltage to the stated value, current will look after itself. Current in this instance is given as a specification rather than a current limit as in an LED.
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    current flow in earthing point problem????

    Adam is correct. Unless everyone else has equipment with infinity insulation resistance. This is why most domestic core balance relays ( safety switches) have a trip level of 30mA. I suspect the op is operating in unknown territory as can be seen by the rather limited information on the outcome...
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    An Electronic Symbol

    Good pickup...I had to look hard for the SS...o_O.........
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    Modular house - intercoms won't work from front to back.

    Balancing circuits for power is not done on the basis of what is plugged in although I tend to keep laundry and kitchen sections seperate. When a house is wired it is done on the basis of number of points. Attempting to balance light against power circuits is a waste of time given power at 1000w...
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    Modular house - intercoms won't work from front to back.

    Trouble with that is, most only have a couple of power circuits and as built should have been approxiately balanced over the 2 phases. Move one onto the other phase and all will more than likely be on one phase. It all depends on how it's been wired, and only a qualified lecky will be able to...
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    Modular house - intercoms won't work from front to back.

    Run an extension lead.
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    1.5v - 100V input.

    Rectify....resistor divide down to 10:1 .....feed into voltage comparitor with a reference voltage on the other leg set below 150mV. Output to a transistor driven relay. Comparitor should be capable of handling over say 15v and driven off your aux supply.
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    Better understanding of Electricity.

    I never had a problem with E=IR. Then again, my first encounter was when 80% exam result was considered a pass in the electrical industry and any numnuts therefore were thinned out and removed.
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    Assistance please with door control circuit

    Still do not follow your logic. If you mean the up down switches stay in whatever position is initially selected, then as soon as the limit re-closes on the return , one would re-energise the former and cause a short. Activation has to be by momentry switch closure with a latching contact on the...
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    Assistance please with door control circuit

    The way I see the drawing, if A button is operated, A relay energises but only for the duration of the button closure. Release the button and the relay drops, nothing is latched. Same with B button/switch. This is supported by " if a SPDT centre off switch is used". Not sure what you mean...
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    Assistance please with door control circuit

    Can't see what latches the "up" and "down" button.
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    Making a cap fed supply safe!

    In addition, as a guide, in my testing, the time for safety switches to trip are from 10 to 30 milliseconds. (that's from 0.5 to 1.5 cycles on 50 Hz at between 10 and 30mA leakage) Better way to travel one would think, approved and proven, along with isolation approach.
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    Dishwasher not heating water

    Looks like this...........(Google is a big help)
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