Voice warming by ic 555 วงจรเสียงเตือนง่ายๆ ด้วยไอซีตองห้า
Operation of the circuit. When connecting to a power supply circuit IC1 is number 555 on the circuit. Form A Stable Multi Vibrator. It serves to produce the frequency of leg 3 with the output frequency is determined by the value of R1, R2, C2, if C2 will add value to the bass sound. Frequency sound will come out in three legs to reduce the current through R3 to bring suit to amplify signals Q1 and Q1 is the amplifier to drive the speakers.