Shared Projects by mfhepp

This is a DC-DC boost converter with effective input and output filters, specially designed for the use with QRP transceivers like the Mountain Topper series. For more details, see

https://github.com/mfhepp/gobox-power

The output voltage can be set to 6, 9, or 12 V, and the input can be either 4 NiMH cells (4.8 V nominal) or 2 LiPo Cells (7.4/8.6V nominal). In the latter case, only 9 or 12 V can be selected as output voltage.

The circuit also includes a simple low battery indicator.

A simple SWR and RF indicator for QRP transceivers

Assembly instructions and source files are on GitHub.

Update 2017-11-10: In the meantime, I received the PCBs of the latest revision 1.2 (dated October 24, 2017), assembled and tested it, and can confirm that it works. Of course, I take no liability whatsoever, but as far as I can see, you can now order the boards and parts.

A simple SWR and RF indicator for QRP transceivers

Important: This PCB is superseded by https://oshpark.com/projects/JtKPis3T because it contained a bug. Do not use this PCB for new projects.

Assembly instructions and source files are on GitHub.

Warning: This OUTDATED version has at least one bug: The GND signal between the actual circuit and the antenna / rig connectors is not connected (because that missing link was hidden behind a junction in the schematic, so the ERC/DRC did not spot this).

I think that adding a short wire from the ANT GND (the rectangular pads) to any of the other pins that should carry GND (e.g. GND side of R3, R4, R5; cathode pins of SWR3 or RF1, or anode of D3) should do the trick, but this has not yet been tested.