Audio Amplifier and Zero Beat Indicator for QRP Transceivers

This projects contains the necessary files and assembly instructions for a small PCB that includes a a) LM386-based audio amplifier and a b) LMC567-based zero beat indicator.

The board was designed for the Mountain Topper SOTA GoBox project, but can be used for any other similar project.

The LM386 amplifier is carefully tuned to operate in RF-noisy environments, as typical for amateur radio transceivers. For that purpose, it includes several additional filter components not found in the mainstream datasheet applications.

Design decisions will also be included in the final version.

Note: This is work-in-progress. I will remove this message when the materials are ready for use.

Overview

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Part List

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Assembly

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Calibration

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Sources

The files in the repository contain

• Gerber and drill files for producing your own PCBs, and
• a KiCad project with the schematics, PCB, and parts and footprints libraries.

KiCad is a great and free electronics design package. For more information, see http://kicad-pcb.org/.

Acknowledgments

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Disclaimer

THE SOFTWARE AND DESIGN ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR DESIGN OR THE USE OR OTHER DEALINGS IN THE SOFTWARE OR DESIGN.