Circuit diagram of the wireless baby monitor circuit is shown in Fig. 1. It is built around a condenser microphone (MIC1), transistors BC549 (T1 and T3) and BC557 (T2), along with a few other ...

Connect the condenser microphone through a wire and place the cabinet anywhere in the target room. Connect output wires to a 0.5-watt speaker kept in the room where you want to monitor from. Any type ...

To start and operate the weather monitor, just connect display to ESP32. Connecting all other modules is optional. Instead of schematic diagrams, I post half-drawings, half-photos, so that it is clear ...