Instructions for Winding T1 and T2
Start by marking each core with a "dot" on one end using a blue "Sharpie" marking pen. Touch the spot
several time to make sure that a permanent dot exists. This "dot" end by our convention will be the
secondary side of each transformer, and have a 2-turn winding on it.
Start the secondary winding with a 3-inch piece of #28 wire, supplied with the kit. Place it in one of the
holes, on the "dot" end of the core, leaving about 1-inch lead sticking out. Take the lead coming out the
opposite end, bend it around, and push it back through the other hole. That's one turn. Repeat the
operation pushing the longer lead back through the hole where you started, bending the lead around
again, and pushing it back through the opposite hole. Snug up the windings by gently pulling on each
lead with a pair of small pliers. The core with the secondary winding will look the the photo below.
If you look at the end of the core opposite where the two leads exit, you should see two wires as shown
in the next photo.
Next, we have to add the 4-turn primary winding. This starts with a 5-inch piece of #28 wire. On the
opposite end of the core from where the secondary winding leads exit, push most of the wire through a
hole, leaving about a 1-inch lead sticking out. As we did with the secondary winding, bend the free end
of this wire around and push it back through the core using the other hole. That's 1-turn that we have
wound. Following this example, repeat that process for 3 more turns. As you go along, try to keep the
windings tight within the core and laying organized and flat so that all of the turns can be added. When
you have the 4-turns on the core, it will look that the next photo.
Notice that the primary winding lead that was being pushed through the core holes ends up about
twice as long as the beginning end. That's a good check that 4-turns has been wound. Cut each of the
leads to about 1/2- inch, scrape off the insulation, and tin the wire up to within 1/8-inch of the core.
The transformer is now ready to install on the PCB. Repeat the process for the other core.
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Summary of Contents for V1R2B
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Page 19: ...Bill of Material 19...
