Operation of the circuit is Q1 and Q2 will work with R3, R4 and C2 is a frequency generator
circuit with output connected to LED1 and speakers SP1. When I press the switch S1 to the C1 will begin to charge allows the voltage to pin B of Q1 increase other. The Q1 is working and Q2 is working with at the C1 charge full cycle will stop oscillator speaker is not.
The LED1 light and hold the release the pressure switch S1, resulting in C1 will start discharger through R3, Q1 to ground. The oscillator circuit sound Sirens in the lower out. If we press the switch S1 and then quickly leave many. The sound will be as continuous as C1 to charge and discharge alternately continuously.
Operation of the circuit. This cycle can be divided into three main parts is the low frequency production. Production of high frequency. The amplifier. The manufacture low-frequency includes Q1(C458), Q2(C458), R2, R3, C2, C3. Which will produce low-frequency out and to extend the Q3. Before you sent with high frequency of origin from Q4(C458), Q5(C458), R8, R9. , C5, C6 signal is included, then the output will come out to the leg E of the Q5(BC547). and then be expanded with Q6(BC547) to drive the speakers. The C1, C4 is intended to stir filter collects them. The R11 will help prevent speaker damage.
Operation of the
circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low frequency is obtained from IC1 connected to astable multi vibrator circuit frequency is set by R1, C2 frequencies that are coming out of pin 3 is about 1 Hz through R2 to be good 5. of IC2, a division produce high-frequency input at Pin 5 will tone the origin of oscillator IC2 is the ripple of voltage from the output of IC1 frequency of IC2 is being set by R3, C3, which, if C3 value. will be very low tone if C3 is less treble The output will have to stand out in three legs of IC2 to stimulate B of Q1 to amplify signals that drive speakers.