Electronic Sleeper Tool

Components :

                Resistor                                    : R1 10k

                                                                : R2 1k2

                                                                : R3 100Ohm

                Trimpot                                    : RV 50k

                Capacitor                                 : C1 10 µF /16V

                                                                : C2 200 µF/ 16V

                                                                : C3 0.1 µF

                Transistor                                 : TR 2SB178

                Speaker  1 Inch

                Switch

This circuit is a circuit that can produce sound resonance that can make people sleepy. This is due to the resonance sound very tiring and resonance vibrations are generated by filling the feedback from the capacitor C1 and C2.