Why 18v in the Emag?

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  • RobAGD
    Cantankerous Administrator

    • Oct 2000
    • 2030
    #31
    Originally posted by p8ntbal4me
    Okay,.. tesed out everything you guys have been offering for advice,... confirming as I go.

    Looking at the board that comes with the emag,.. Im going to assume that it uses some type of relay to switch the (+) to the solenoid? If thats the case,.. what type of relay does it use? Numbers on my board are kind of hard to read,.....

    Does the board use all 18volts or does it regulate it down for the components but keep the solenoid with a true 18VDC?

    Top of the board, there are 2 flat black ( brain fart here ) transistors is teh best my brain will come up with right now. 18v kicks to the when it gets a switch sig it flips 18v to the noid. There is a 5v reg on there someplace as well or the switch and other componets. Probe a bit with your multimeter and you will get it.

    I am sure some where in teh tech section are pictures for testing the mosfets on teh board because they would every now and then burn out.

    -R
    Serving AGD customers since 93, wishing I could beat some common since into some of them about 5 hrs later.

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      • athomas
        Of course it works-its AGD
        • Jan 2002
        • 8039
        #32
        The board runs at 5v which is regulated down from the 18v supplied. The 18v supply is directly fed to the solenoid through the output transistor switches. I think they are active low, which means 18v is supplied directly to the solenoid and the transistor pulls the other side of the transistor to ground to allow current to flow.
        Except for the Automag in front, its usually the man behind the equipment that counts.

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          • p8ntbal4me
            No more UTBs!
            • Aug 2003
            • 2560
            #33
            Okay,.. that will get me started.

            Im looking in the tech sections now,.. might head over to Doc's site as well for some info.

            I figured the board must be regulated down,.. I was thinking the orange little piece near the LED was the regulator for the board.

            If anyone knows the type of relays and where to get them it would speed things up. But thanks athomas and Rob for the start. Its much easier to work on this whe people say "this is how it does that" type of answers.

            Much appreciated!
            _______________________
            Jai "P8ntbal4me" Menard

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              • don miguel
                the legend
                • Sep 2006
                • 1141
                #34
                Originally posted by BlueMagRT
                it is 18v because as the great Tom Kaye put it: 9v's suck.

                the e-mag has a large battery to power a larger solenoid. this reduces heating of the solenoid which gives better performace, more shots percharge, and easier pull. It is also a more reliable option. i believe tom said you could shoot the e-mag at full auto and not over heat the solenoid until the battery is almost dead.
                absolutely.

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                  • p8ntbal4me
                    No more UTBs!
                    • Aug 2003
                    • 2560
                    #35
                    Found the part if anyone wants to know what it is,.... :)

                    Fairchild Semiconductors NDT451AN (SOT-223)

                    Fairchild Part #: NDT451AN
                    Mouser Part #: 512-NDT451AN

                    Connects to the solenoid GND. POS lead runs direct to the solenoid
                    _______________________
                    Jai "P8ntbal4me" Menard

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