Engineering Prototype Report

EPR-00010

Page 9 of 24

Transformer Construction:

Double Primary

Layer

Start at Pin 2. Wind 40 turns of item [3] from left to right. Wind in a single layer.

Wind remaining 33 turns (73 total) in the next layer from right to left. Finish on Pin 1.

Bias Winding

Start at Pin 4. Wind 16 turns Parallel Bifilar of item [3] from left to right. Wind

uniformly, in a single layer, across entire width of bobbin. Finish on Pin 5.

Reinforced

Insulation

1 Layer of tape [5] for insulation.

+14V Winding

Start at Pin 10. Wind 13 turns Parallel Bifilar of item [4] from left to right. Wind

uniformly, in a single layer, across entire width of bobbin. Finish on Pin 9.

Outer Insulation

3 Layers of tape [5] for insulation.

Core Preparation

Wrap bottom of E core [1] with 2 layers of tape [6] as shown.

Final Assembly

Assemble and secure core halves. Impregnate uniformly [7].

Materials

Item

Description

[1]

Core: EPCOS (Siemens) E 20/10/6,B66311-G-X167, or equivalent.

.

[2]

Bobbin: EPCOS (Siemens) B66206-J1110-T1, or equivalent.

[3]

Magnet Wire: #30AWG Heavy Nyleze.

[4]

Triple Insulated Wire: # 28 AWG .

[5]

Tape: 3M 1298 Polyester Film (white) 12.2mm wide by 2.2 mils thick.

[6]

Tape: 3M 1298 Polyester Film (white) 15.7mm wide by 2.2 mils thick.

[7]

Varnish.

Core [1]

Tape [6]