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Jan Rowland

Which brings me to this: The dimensioned sketch of E-I laminations herewith shows the entire stack of "E's" and "I's" completely separate. Assembly of a transformer larger than, say, 10 VA this way is not ideal. It is much better, even essential in larger ones, to alternate the "lay" of the E and I. Oh, you might put in pairs of laminations, each time, or even threes, but better, alternate, one-for one! That is, shove an E into right side of the coil, then the next one from the left side. Then the third from the right, again. And so on, until your pre-figured number of laminations are "stacked". Then, carefully push-in the "I" pieces between the E's, on both sides (or, top and bottom). Don't forget, one goes also "outside" on both sides! Now, assemble those "L-brackets", using machine screws of the appropriate size and length, and washers and hex-nuts. Gently tap the "I" pieces down against the "feet" of the E-legs, until the faces of the stack are smooth (i.e., no gaps left between the E- and I-pieces, "inside".) Tighten the bolts on the "L-brackets" nicely, but not so tight the bolts break or the threads strip!