17)Now you can solder the eight connections under the PCB. I recommend doing one
pair of wires at a time; this way, the other wires will hold the toroid in place and stop
it falling out. Start with the two un-twisted wires. Pull each wire tight, bend it over at
about 45-degrees, and cut it 1-2mm away from the PCB surface. Having bent the
wire prevents it from falling out. Now solder the wire. Remember to hold the
soldering iron to the joint for 10 seconds or so, to allow the enamel insulation to burn
off.
Repeat for all the other wires, one pair at a time, until all eight are soldered. If you
have a DVM, check for DC continuity (zero ohms resistance) across each winding. If
you do not get the expected continuity, then it means either
a) you have not managed to scrape or burn away the enamel insulation properly so
there is no electrical connection AND/OR
b) you put the wires into incorrect holes AND/OR
c) your expectation is wrong because you have not identified which pad on the PCB
is labeled 1-8 in the diagram.
18)The final picture shows the toroid installation completed.
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