ID-O-Matic II Manual
02/27/2010
Page 5 of 14
33.
Carefully install the small 20 MHz cylindrical crystal in location X1. NOTE: This part is easy
to damage with excess heat while soldering. Be extra careful!
34.
Install the DB-9 connector in location J1.
35.
If you purchased the terminal block, install it at J1 now. Make sure the “open” side where
there are openings for wires faces the outside edge of the board.
36.
Install the 6-pin header strip in the indicated location for the INH and COR jumpers.
37.
Mount the Dual-color LED in the position indicated. Pay attention to the markings on the
PCB, and match them with the leads on the LED. Note that one lead has a square bend, and the
other has an angled bend. You can also mount the LED remotely using any convenient length of
wire.
Powering the ID-O-Matic II:
Power can be supplied by battery or a DC power source up to 24V. Connect the power input to terminals
1 (GROUND) and 2 (+V) of the terminal strip. Warning: There is no diode to protect against
reversed power leads – double check your connections!! If you plan to build your ID-O-Matic II into a
rig or a repeater controller, don't worry about battery backup; all memory and parameter settings are
retained in non-volatile EEPROM memory and will be automatically recalled when power is applied.
Check the power supply voltage at pins 5 (GROUND) and 14 (POWER) on the 18-pin IC socket at U2.
Once you have verified that there is a safe voltage of 5V plus or minus .25V or so, remove power. Install
the ID-O-Matic chip in socket U2, and the LM386 amplifier chip in U3. Make sure to orient the two
chips properly, with the Pin 1 dot and/or notch toward the notch indicated by the silkscreened outline on
the PCB.
Off-Board Connections
You may want to install a RESET switch, speaker, etc. All off-board connections normally needed are
available at the ten pads (or screw clamp terminals, if installed) marked J1. These connections may be
left unconnected, or can be used as follows:
Pad
Function
J1-1
Ground
J1-2
+V DC power input
J1-3
PTT output; open-drain MOSFET, 60 V 200 mA max.
J1-4
CW output; open-drain MOSFET, 60 V 200 mA max.
J1-5
Beacon indicator. This is a TTL level signal that goes high during a
beacon ID, and is low the rest of the time. This output is not
buffered, do not exceed 5V/15 mA.
J1-6
RESET input; ground momentarily to reset the CPU. Do not allow
this signal to exceed 5V.
