According to Joseph, the drone is small and can be made using readily available parts such as an ESP32 module, ... As you can see, the circuit board is exposed. The circuit diagram is as follows.

Open up the schematic for what is in the ESP32 MODULE. There’s more than the IC in there. Decoupling caps are always a good idea since you are dealing with a radio that will have peak transmissions.

There’s no shortage of Geiger counter projects based on the old Soviet SBM-20 tube, it’s a classic circuit that’s easy enough even for a beginner to implement — so long as t… ...