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Install the square trimmer potentiometer in the AUD_LVL position. Be sure to
orient it right side up as indicated. If your potentiometer is a side-adjust style, install
it with the adjustment slot facing the bottom edge of the printed circuit board.
Your kit should contain a 6-pin header strip. Using a small pair of side cutters,
carefully separate it into two 3-pin strips. Install these in locations JP1 and JP2, with
the longer ends facing upward.
If you are building your Connection Kit board to plug onto an ID-O-Matic, locate two
2-position and one 6-position header socket strips. These are the black socket strips
with square holes. Install these on the bottom side of the board in locations J_ID,
TONE and PWR. You can then install header pins on your ID-O-Matic on the power,
audio and JP1 locations.
Apply a source of filtered, regulated DC power between 9 and 16 Volts to your
Connection Kit board via the PWR pads. Ground is on the left, positive is on the
right. Check for DC power not exceeding 16V between pin 4 (-) and pin 6 (+) on
socket U1.
Remove power. Install the LM386 audio amplifier chip in socket U1. Make sure
the notch or Pin 1 indication on the chip is facing up, matching the silk-screened
outline on the PCB.
Your Connection Kit is now ready to use!
Input polarity selection
Your Connection Kit includes two input signal circuits. The inputs are marked INH and
STRT, and the outputs are found in pins J_ID 2 (INHIBIT) and J_ID 3 (START). Input
voltages may be up to 24V DC. The input signals are clipped to 4.7 Volts maximum by
resistors R1 and R7, and Zener diodes D1 and D2. The signals are inverted by
MOSFETs Q1 and Q2.
The logic level of the output signals may be selected using jumpers installed at JP1 and
JP2. Installing the jumper plug from JP1 or JP2 center pin to the "NI" position will use
the non-inverted signal; from the center pin to the "I" position will use the inverted
signal. When used with the ID-O-Matic, this means you would use the "I" position for
active-high COR or squelch input signals, and the "NI" position for active-low inputs.
Audio Inputs & Mixing
Two audio inputs are provided. The TONE input is used for sidetone or Morse ID audio
from an ID-O-Matic, PicoKeyer or other source of square-wave audio Morse ID. The
AUDI input is intended for receiver audio when used in a repeater or node, and can be
left disconnected if no other audio source is used. The volume of the Morse audio from
the TONE input can be adjusted with the trimmer potentiometer.
Connection Kit Manual
04/18/2008
Page 3 of 4
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