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DDF1 DOPPLER DIRECTION FINDER ASSEMBLY STEPS
Although we know that you are anxious to complete the assembly of your di-
rection finder finder kit, it will become necessary to assemble in a specific or-
der to accomplish the final components installation of your unit. Try to avoid
the urge to "jump ahead" installing components. Please also note that the
components will mount on BOTH SIDES OF THE PRINTED CIRCUIT
BOARD for proper alignment into the provided case assembly.
Since you may appreciate some "warm-up" soldering practice as well as a
chance to put some "landmarks" on the PC board, we'll first install some of
the larger mounting components. This will also help us to get aquainted with
the up - down, left - right orientation of the circuit board. Remember that the
majority of the components will be mounted on the "component " side of the
circuit board and soldered on the "solder " side of the circuit board, the side
with the printed circuit traces. Have a look at the component layout diagram
to help with your assembly.
1. Install J1, the 2.1 mm DC input connector. Notice that this mounts on
the "component side of the circuit board and the solder leads push
through the circuit board to protrude through the solder "pads" for con-
nection. Be sure to push the part as close to the circuit board as it will
go, as the alignment of this part is important in getting the case holes to
line up with the part. Solder all three leads; don't be afraid to use enough
heat to flow the entire connection.
2. Identify and install J3, the miniature audio input jack. Gently "rock" the
component into place before soldering. Be sure to solder the mounting
"tabs" into place to provide for a secure fit.
3. In the same manner, identify and install J2, the DB 9 connector,
which will output the switching control voltage to the antenna switch. Be
sure that the connector fits snugly to the printed circuit board. Solder all
11 connections to the jack, being careful not to "bridge" solder between
the pins. Take your time here as a missed solder connection now can
cause an hour of troubleshooting at the completion of your kit.
There we go, now we're on our way to getting this one put together! Double
check your connections, make sure that the jacks are resting snugly on the
circuit board, and let's continue. We'll get started working on the clock sec-
tion of our circuit, using a 555 oscillator IC.
4. Moving towards the lower right of the main circuit board (component
side view), find the position for U4, one of the 555 timer IC's. Install U4,
the 555 timer IC. Make sure to align the notch or dot associated with pin
one with the notch shown in the parts layout diagram. Also check to be
DDF1 • 14
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