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Updating older hf amplifier

I decided to place each Pi in its own Hobbycraft box.

The Zeroes are very small of course and even with an AA powerbank there was space to fit a video camera with its own powerbank inside the box: Next came the main Pi, with its own camera, 3G (later removed due to insufficient power from the powerbank) and UBlox USB GPS, all inside 2 of the same boxes glued together: Finally, I added a backup tracker in case the main one failed for any reason, and to provide a programmed cutdown to prevent the flight drifting too far: There was one last thing to do – my Revell model isn’t identical to the version that NASA flew, and most prominently was missing a camera.

Easily fixed with some foam polystyrene and a plastic cap! The flight predictions for my chosen date were not ideal, but quite good for the time of year.

Aside from the cold, it was a very nice day to launch – fairly clear skies and not too much ground wind.

) headphone amp design has already proven surprisingly popular.

I also wanted live images, ideally from different viewpoints.

I believe it will even embarrass many far more expensive rival or beat much more expensive products.

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To make that task easier I removed some items from the flight, allowing for a smaller balloon and less gas.The price details are all in the Bill Of Materials.If someone wants to roll the dice and make a few hundred O2 amps things get even better.Some of the competition would rather make vague and sometimes even misleading claims leaving you to wonder.And a lot of amps only work well with some headphones but are a poor match with others.In the end it wasn’t really feasible to set up vastly different viewpoints as the astronaut model is quite large and the payload would have then been huge (and cumbersome, and delicate), so I had the cameras all quite close to each other.