After looking into designing a holder for the new smaller amps I am using for the sound output, I have now decided to incorporate this into the PCB itself. Not soldered the headers on, but this should mean everything is now secure inside the ‘Rock’ shells, but also detachable if anything needs maintenance / replacement.
So, almost there now with the first fully-working prototype of the 4 Space Rocks and transmitters (once I get to sit down and solder the headers, that is).
The components for the second two Space Rocks needed to take up less space. In the case of Undarum, the amplifier was too large. Shown here is the circuit on a new PCB (version 3) using an Adafruit Mono 2.5W Class D Audio Amplifier (PAM8302), which has a much smaller footprint and height than the previous self-assembly amplifier kit I was using.