www.hamgadgets.com
2014-01-17
ID-O-Matic III
28
Assembly Order
It’s a good idea to start with the shorter parts first, and those that might be difficult to install once
the surrounding parts are soldered in. I recommend you install the parts in the following order:
□
Install all of the
ceramic capacitors
. These are not polarity sensitive, meaning you can
install them either way.
BE CAREFUL!
The 10
µF
and 0.33
µF
ceramic capacitors look
the same, but the capacitor values are
not
interchangeable. The 0.33 µF capacitors are
marked 334, and the 10 µF is marked 106. Use a magnifier if you need to read the
markings, they’re not easy to see.
Note:
C9 is part of the de-emphasis circuit. If your equipment does not require de-
emphasis on the receiver audio, leave position C9 empty.
Also
:
Don’t use the picture on Page 1 for placement of C1 and C2! That’s a prototype board, and looks
different from your kit. If you have ceramic capacitors for C1 and C2 the placement is not super critical,
but you should install them the way the instructions say. Later kits will have 3.3 µF electrolytic caps for C1
and C2.
Install whichever are included with your kit.
□
Solder in the
USB connector
. You’ll want to use a piece of tape or a small clamp to hold
it in place while you get a couple of the pins soldered to hold it in place. Don’t use your
finger, the connector body gets HOT!
□
Bend the leads of the cylindrical
crystal
over and insert them into the holes provided.
Make sure the two lead wires are not touching. When soldering the crystal lead wires to
the board, don’t take too long – the crystal is more easily damaged by excessing heat than
other components.
□
Now it’s time to install
Zener diodes
ZD1 – ZD3. Make SURE you
have the right diodes! There are THREE identical Zener diodes with
glass bodies. One end of the diode body will have a black band marked
around it; this is the cathode end. Make sure that end is installed INSIDE
the circle on the circuit board. Bend the other lead back alongside the
diode body as shown in the picture.
□
Install the
IC socket
– make sure this is oriented correctly, with the notch facing the edge
of the board. Don’t insert the IC just yet.
□
Install All
resistors
R1 through R14 (R14 is not present on earlier boards, so
install R1-R13). These are also not polarity sensitive. Bend one lead over
parallel to the resistor body and insert the part with the body inside the
silkscreened circle.
Do not install R_HT
unless you need it for PTT with a handheld
transceiver (see instructions).
Summary of Contents for ID-O-Matic III
Page 1: ...www hamgadgets com 2014 01 17 HamGadgets ID O Matic III Assembly Setup and Use Guide ...
Page 26: ...www hamgadgets com 2014 01 17 ID O Matic III 26 PCB Layout Schematic Rev C ...
Page 27: ...www hamgadgets com 2014 01 17 ID O Matic III 27 PCB Layout Schematic Rev D ...
Page 32: ...www hamgadgets com 2014 01 17 ID O Matic III 32 ...
