Communication Concepts AN762 Construction Hints - Manual (Page 3)

Figure 2
Solder the wire leads from the output of T3 to the PC board. Clip the excess
leads close to the PC board.
The input transformer T1 is mounted next. Strip the wire leads back to
approximately 3/16 inch of insulated wire from the transformer end. If swage pins are
used (optional) mount them in the two holes on the PC board and solder on the bottom.
Insert the insulated wires in their holes and position the split-end of the transformer up
against the swage pins and solder. The transformer must be insulated from the PC
board using a piece of mylar, Teflon, or some similar insulating material. In lieu of
swage pins, short pieces of #20 bus wire or something similar can be inserted into the
two holes on the PC board and soldered. Then bend the ends of the wires over to the
split-ends of the transformer and solder. Clip all Excess leads.
Install the regulator (MC1723). Match the TAB orientation of the regulator with
the notch on the PC board and push the device down to within 3/8 inch of the PC board.
Solder the regulator in place. (Be very careful …!!!, the PC lands in this area are
extremely close and solder bridges are easy to make.) Clip the excess leads.
Install the potentiometer (push it firmly down in place on the circuit board and
solder it in place). Note: The pot must be installed BEFORE resistor R6 is installed
because of an interference fit between the pot (certain manufacturer) and the 1K resistor.
Clip the excess leads.
Install all of the ½ watt carbon resistors in their proper locations (refer to the
placement layout in the Application Note and solder in place. Clip the leads closely to
the PC board.
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