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VT228

100VA Mains Transformer Kit
Bobbin detail:	Order No. VT228 Price £35.63 Make your own mains transformer! This do-it-yourself transformer kit has a ready-wound 120 – 240V primary winding on one one half of a split bobbin, E and I laminations, end frames and clamping bolts, and solder tags. Secondary windings can be wound onto the free half of the bobbin using enamelled copper wire for a total output not exceeding 100VA (100 Watts). To find the number of secondary turns required, multiply the output voltage required by 4.16 turns per volt, +1% for each multiple of 10VA of loading. E.g. +10% if the full 100VA will be used. (This is what is meant by 'regulation' as so many percent.) Wire for winding the secondaries is not included in the kit. Hint Normally the orientation of the 'E' and 'I' laminations are reversed at each level, so that there is an equal number of 'E's and 'I's on each side. However if all the 'E's are placed on one side and the 'I's on the other, and a thin strip of paper inserted between to separate the two groups, a DC choke may be made, the paper forming an 'air gap'. Assembled dimensions: width 88mm x depth 70mm x height 74mm. Core size: 85 x 72 x 28mm thick. Weight: 1.35 kg. Wire Size Guide on the assumption that the current density for each winding is taken to be 1,200 amps/sq. in., as a good guide, then the equivalent thickness of enamelled copper wire required for a particular current rating are approximated below: Current           100mA 200mA 300mA 400mA 500mA 1A 2A 3A 4A 5A 6A 7A 8A Wire Size           0.3mm 0.4mm 0.45mm 0.55mm 0.56mm 1.0mm 1.2mm 1.5mm 1.7mm 2.0mm 2.2mm 2.3mm 2.5mm Equiv. SWG 28 28 26 24 23 20 18 16 15 14 14 13 12 Note that for best results you should really aim to try to fill the former with wire, a requirement which will also have a bearing on the thickness of wire used.
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