HF PackerAmp V4, Construction Manual

Page: 14 / 76

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Remove T2 from the mounting holes and use a
soldering iron to heat the insulation at the points where
you will be soldering to the board. You need at least
750 degrees F to remove the insulation. Tin the leads
removing insulation and excess solder.

•
Re-insert T2 on the board at the T2 outline. Pull the
leads tight and solder in place. Install

•
Trim the excess lead length and reflow connections.
•
This is a typical spot where you can have a poor solder
connection. Inspect and re-solder if necessary.
Adjust the wire spacing to match the picture. The top and
bottom of the core should be clear so T2 and T3 will be
minimum height to not create a clearance problem with the
board above.
Fabrication and Assembly of T3
•
One FT50-43 torroid core is used for this transformer.
Cut two #24 AWG wire (0.022 inch diameter) 11 inches
long . No twist is required or desired. Insert the two
wires through the core. Bend the wires into a U-shape.
Holding the two wires together in one hand with the
cores at the bottom of the U-Shape, grasp the wire in
the rear and insert the wires on the front right side
through the core four additional times. Pull each wrap
snug. Avoid crossover of the leads.
•
After completion of the loops on the right side, pass
the remaining wires through the core on the front left
side 5 times. Pull each wrap snug. You will now have
10 turns passing through the core.
•
Separate and scrape the ends of the wires so you can
determine the start and finish of each wire. Use the
multi-meter to measure continuity.
•
Winding # 1 goes to pins 1 and 2. Winding #2 goes to
pins 3 and 4.
•
Insert the wires through the appropriate holes and pull
snug to form the leads in the shape required.
•
Pull T3 from the mounting holes and use a soldering
iron to heat the insulation at the points where you will
be soldering to the board. You need at least 750
degrees F to remove the insulation. Tin the leads
removing excess accumulated Install

•
Re-insert T3 on the board at the T3 outline. Pull the
leads tight and solder. Install

•
Trim the excess lead length and reflow connections.
Fabrication and Assembly of L1 and L3
•
L1 and L3 are identical and require 12 inches each of
the remaining #24AWG wire.