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 build in a vertical height order - installing the shortest components first, building toward the tallest, and finish with the connectors on the ends.

Install all 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. Bend both of the resistor leads sharply at the body at a 90 degree angle.

Install the crystal.

Install the diodes and shortest capacitors, observing polarity on all diodes and the polarized capacitors! The square pads are the banded end of the diodes and the + of the electrolytic capacitors. When installing the capacitors, observe 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 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 (short lead to the square hole).

Install the IC sockets, and potentiometers.

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

Install the two, three and four pin headers.

Install the relay. It doesn't really matter which way it's oriented, but it looks better if the printing is out toward the edge of the board so you can read it.

Install the 8-pin ICs - 2 - LM386s and 1 - LM555.

Next, install the larger capacitors. You may need to bend the leads of these straight so they sit down against the board.

Then, finish by installing the Mini-DIN-6 and USB "B" socket connectors.

Put the jumper shorts over the headers per the DRA-80 jumper document.

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

Email Kevin Custer for support.
 

DRAC-12 - 6-foot Mini-DIN-6 Radio Cable  can be added optionally to connect several data capble radios to the DRA-80.

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 2, 2021, W3KKC All Rights Reserved!