Custom Products for the Digital Radio Amateur Enthusiast

Assembly:
If you purchased our kit, refer to the parts list and make sure you have all of the components you need to build the kit. All of the components are supplied with the kit, and while we make every effort to be sure we didn't omit any components, it can happen. If you are missing anything, or ruin something, just contact us.

Click here for Parts List.

Assembly can be done by personal choice, but you may find it easier to install the shortest components first, building toward the tallest, and finish with the connectors on the ends.
The Parts List has several construction notes as well.

Install all fixed resistors. Some resistors color bands may be hard to make out. If in doubt, use an ohm meter to verify the value before soldering it in place.

Now install all diodes. The square pads are the banded end of the diodes.

Install the crystal - it doesn't matter which way.

Install the shortest capacitors, observing polarity on the polarized ones! The square pads are the + of the electrolytic and Tantalum capacitors. Small capacitors are identified as follows: "47" or "470" = 47pF, "103" = 0.01uF, "104" = 0.1uF, "105" = 1uF. In other words the first two digits are the leading value and the third digit (if present) is the number of zeros (multiplier) you add to determine the final value.

In addition, there are two components that you need to make sure you install correctly as they are polarized and installed opposite from one another - C3 and C5. The positives of the capacitors face one another - in other words, they go toward the center of the circuit board.

Then, install the 3 LEDs (long lead into the round hole).

Install the IC sockets aligning the notch with the silkscreen, and then the potentiometers.

Next, install the transistors (flat to flat on silkscreen).

Install JU1, JU2 and JU4 male 2-pin headers.

Install JU3 male 3-pin header.

Next, install the larger capacitors. If required, bend the leads of these straight so they sit down against the board.

Then, finish by installing the RJ45, Speaker Jack, and USB "B" Socket connectors, 555 IC, configuration socket wires and anything else I forgot to tell you about. The 555 IC's notch lines up with the notch on the socket.

Information on the CM119A.
Click here to download a manual for the C-Media CM119A.

Email Kevin Custer for support.
 
Plastic case for the DRA-39 - Several colors!

Product of Masters Communications, all rights reserved.
Specifications may change without notice.
Images property of Kevin Custer - Masters Communications.
Board layout by Kevin Custer - W3KKC
HTML May 30, 2022, W3KKC All Rights Reserved!