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After scraping the insulation from the ends of all four wires, connect the green 2 wire to the red 1
wire and twist together. You will now have three leads: the red wire on the left, the twisted pair,
and the green wire on the right. Do not install T1 yet.
You will now install (locate, place, and solder in place) the parts on the PC board. Use the silk-
-screen layout in the back of this manual to assist in locating where parts are to be installed. Parts
are installed and soldered in order of height, from shortest to tallest.
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Install all of the resistors, R1, 11-21. Be sure to check the values with the parts list. Most of the
resistors are 1/8 watt and may be hard to read. Use an ohmmeter to verify the values if you have
trouble identifying them.
R1, R17, R21 - 100 ohm – brown-black-brown
R18 - 150 ohm - brown-green-brown
R12-13, 15, 20 - 1K ohm – brown-black-red
R19 - 3.3K ohm - orange-orange-red
R11, 14 - 10K ohm – brown-black-orange
R16 - 1M ohm – brown-black-green
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Install the 1N4148 diodes, D1, 2, 4-9. Note the band polarity.
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Install the larger 1N4001, D3. Note the band polarity.
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Install the 10K 10 Pin SIP resistor, RSIP1. Be sure to note the orientation of the SIP resistor. A
small line (or dot) on the side with writing marks pin 1.
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Install T1. It lies flat against the PC board and the #18 wire from the SO-239 will pass through the
center (you will install this later). You may wish to use a small amount of silicon RTV or hot glue to
hold T1 in place, but wait until after the unit is tested before applying it in case there are problems.
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Install the .01uf monolithic capacitors, C3-8, 10, 12-13, 23-24, 35.
- 7 -
Fig 3. T1 winding example
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