Minimalistic NE555 design - simple sound generator using only one piezo element (membrane) and one potentiometer to change frequency (besides NE555 and battery). Switch can be used to learn Morse code transmission.
Schematic:
Video:
Minimalistic NE555 design - simple sound generator using only one piezo element (membrane) and one potentiometer to change frequency (besides NE555 and battery). Switch can be used to learn Morse code transmission.
Schematic:
Video: